Function blocks (FB) for process control and electronic device description language (EDDL) - Part 2: Specification of FB concept (IEC 61804-2:2018)

This part of IEC 61804 is applicable to function blocks (FB) for process control.
This document specifies FB by using the result of a harmonization work as regards several
elements.
a) The device model which defines the components of an IEC 61804-2 conformant device.
b) Conceptual specifications of FBs for measurement, actuation and processing. This
includes general rules for the essential features to support control, whilst avoiding details
which stop innovation as well as specialization for different industrial sectors.
c) The electronic device description (EDD) technology, which enables the integration of real
product details using the tools of the engineering life cycle.
The standardization work for FB was carried out by harmonizing the description of concepts of
existing technologies. It results in an abstract level that allowed the definition of the common
features in a unique way. This abstract vision is called here the "conceptual FB specification"
and is mapped to specific communication systems and their accompanying definitions by the
industrial groups.
NOTE This document can be mapped to ISO 15745-1.
There are solutions on the market today, which fulfil the requirements of this document and
show how the conceptual specification is implemented in a given technology. New
technologies will need to find equivalent solutions (see Figure 4).

Funktionsbausteine für die Prozessautomation und elektronische Gerätebeschreibungssprache - Teil 2: Festlegung des Funktionsbausteinkonzepts (IEC 61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le langage de description électronique du produit (EDDL) - Partie 2: Spécification du concept de FB (IEC 61804-2:2018)

L'IEC 61804-2:2018 spécifie les blocs fonctionnels sur la base des résultats d'un travail d'harmonisation concernant plusieurs éléments. a) Le modèle pour un appareil qui définit les composants d'un appareil conforme à l'IEC 61804-2. b) Les spécifications conceptuelles des blocs fonctionnels pour le mesurage, l'activation et le traitement. Ceci inclut des règles générales applicables aux caractéristiques essentielles à l'appui du processus de commande, tout en évitant les informations détaillées qui mettent un terme tant à l'innovation qu'à la spécialisation pour différents secteurs industriels. c) La technologie de description électronique de produit (EDD - electronic device description), qui permet, en utilisant les outils d’ingénierie, l’intégration de produits réels dans les systèmes tout au long du cycle de vie. Cette troisième édition annule et remplace la deuxième édition parue en 2006 et comprend des parties de l’IEC 61804-1, qui a été supprimée en janvier 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) ajout de la commande mapping avec la communication à l'Article 8; b) déplacement et reformulation de la définition du niveau de compatibilité de l’IEC 62804-1 dans la nouvelle Annexe B et dans les termes et définitions; c) ajout du concept de mandataire dans la nouvelle Annexe C.

Funkcijski bloki (FB) za nadzor procesov in opisni jezik za elektronske naprave (EDDL) - 2. del: Specifikacija koncepta FB (IEC 61804-2:2018)

Ta del standarda IEC 61804 se uporablja za funkcijske bloke (FB) za nadzor procesov.
Ta dokument določa funkcijske bloke, pri čemer so uporabljeni rezultati usklajevalnega dela, ki obravnava več elementov.
a) Model naprave, ki opredeljuje komponente naprave, skladne s standardom IEC 61804-2.
b) Konceptualne specifikacije funkcijskih blokov za merjenje, proženje in obdelavo. To vključuje splošna pravila za osnovne značilnosti z namenom zagotavljanja podpore za nadzor in hkratnega izogibanja podrobnostim, ki preprečujejo inovacije in specializiranje za različne industrijske sektorje.
c) Tehnologija opisa za elektronske naprave (EDD), ki omogoča integracijo dejanskih podrobnosti izdelka z uporabo orodij življenjskega cikla inženiringa.
Standardizacijska dela za funkcijske bloke so bila izvedena z usklajevanjem opisov konceptov obstoječih tehnologij. Rezultat je abstraktna raven, ki je omogočila opredelitev skupnih značilnosti na edinstven način. Ta abstraktna vizija je v tem dokumentu označena kot »konceptualna specifikacija funkcijskih blokov« in je preslikana v specifične komunikacijske sisteme ter njihove opredelitve, ki so jih oblikovale industrijske skupine.
OPOMBA: Ta dokument je mogoče preslikati v EN ISO 15745-1.
Na trgu že obstajajo rešitve, ki izpolnjujejo zahteve tega dokumenta in prikazujejo, kako so konceptualne specifikacije implementirane v posamezni tehnologiji. Nove tehnologije bodo morale najti ustrezne rešitve (glej sliko 4).

General Information

Status
Published
Publication Date
07-May-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Mar-2018
Due Date
03-Jun-2018
Completion Date
08-May-2018

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SLOVENSKI STANDARD
SIST EN IEC 61804-2:2018
01-junij-2018
Nadomešča:
SIST EN 61804-2:2007
Funkcijski bloki (FB) za nadzor procesov in opisni jezik za elektronske naprave
(EDDL) - 2. del: Specifikacija koncepta FB (IEC 61804-2:2018)

Function blocks (FB) for process control and electronic device description language

(EDDL) - Part 2: Specification of FB concept (IEC 61804-2:2018)
Funktionsbausteine für die Prozessautomation und elektronische

Gerätebeschreibungssprache - Teil 2: Festlegung des Funktionsbausteinkonzepts (IEC

61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le langage de description

électronique du produit (EDDL) - Partie 2: Spécification du concept de FB (IEC 61804-

2:2018)
Ta slovenski standard je istoveten z: EN IEC 61804-2:2018
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.060 Jeziki, ki se uporabljajo v Languages used in
informacijski tehniki in information technology
tehnologiji
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
SIST EN IEC 61804-2:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61804-2:2018
---------------------- Page: 2 ----------------------
SIST EN IEC 61804-2:2018
EUROPEAN STANDARD EN IEC 61804-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 25.040.40; 35.240.50 Supersedes EN 61804-2:2007
English Version
Function blocks (FB) for process control and electronic device
description language (EDDL) - Part 2: Specification of FB
concept
(IEC 61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le Funktionsbausteine für die Prozessautomation und

langage de description électronique du produit (EDDL) - elektronische Gerätebeschreibungssprache - Teil 2:

Partie 2: Spécification du concept de FB Festlegung des Funktionsbausteinkonzepts

(IEC 61804-2:2018) (IEC 61804-2:2018)

This European Standard was approved by CENELEC on 2018-02-14. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61804-2:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 61804-2:2018
EN IEC 61804-2:2018 (E)
European foreword

The text of document 65E/567/FDIS, future edition 3 of IEC 61804-2, prepared by IEC/SC 65E

"Devices and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement,

control and automation" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 61804-2:2018.
The following dates are fixed:
(dop) 2018-11-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-02-14
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61804-2:2007.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61804-2:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60854-1 NOTE Harmonized as EN 60854-1.
IEC 61131-3 NOTE Harmonized as EN 61131-3.
IEC 61804 series NOTE Harmonized as EN 61804 series.
IEC 61804-3 NOTE Harmonized as EN 61804-3.
IEC 61804-5 NOTE Harmonized as EN 61804-5.
---------------------- Page: 4 ----------------------
SIST EN IEC 61804-2:2018
EN IEC 61804-2:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61158 series Industrial communication networks - EN 61158 series
Fieldbus specifications - Part 1: Overview
and guidance for the IEC 61158 and IEC
61784 series
IEC 61499-1 2012 Function blocks -- Part 1: Architecture EN 61499-1 2013
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
---------------------- Page: 5 ----------------------
SIST EN IEC 61804-2:2018
---------------------- Page: 6 ----------------------
SIST EN IEC 61804-2:2018
IEC 61804-2
Edition 3.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Function blocks (FB) for process control and electronic device description
language (EDDL) –
Part 2: Specification of FB concept
Blocs fonctionnels (FB) pour les procédés industriels et langage de description
electronique de produit (EDDL) –
Partie 2: Spécification du concept de FB
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-5128-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 61804-2:2018
– 2 – IEC 61804-2:2018  IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, abbreviated terms and conventions .................................................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................. 18

3.3 Conventions for lexical structures ......................................................................... 19

4 General function block (FB) definition and EDD model ................................................... 20

4.1 Device structure (device model) ............................................................................ 20

4.1.1 Device model description ............................................................................. 20

4.1.2 FB type ........................................................................................................ 23

4.1.3 FB execution ................................................................................................ 25

4.1.4 Reference between IEC 61499 and IEC 61804 models ................................ 26

4.1.5 UML specification of the device model ......................................................... 26

4.1.6 Classification of the algorithms .................................................................... 28

4.1.7 Algorithm description ................................................................................... 29

4.1.8 Input and output variables and parameter definition ..................................... 29

4.1.9 Choice of variables and parameters ............................................................. 30

4.1.10 Mode, Status and Diagnosis ........................................................................ 30

4.2 Block combinations ............................................................................................... 30

4.2.1 Measurement channel .................................................................................. 30

4.2.2 Actuation channel ........................................................................................ 31

4.2.3 Application ................................................................................................... 32

4.3 EDD and EDDL model........................................................................................... 32

4.3.1 Overview of EDD and EDDL ........................................................................ 32

4.3.2 EDD architecture ......................................................................................... 33

4.3.3 Concepts of EDD ......................................................................................... 33

4.3.4 Principles of the EDD development process ................................................. 33

4.3.5 Interrelations between the lexical structure and formal definitions ................ 34

4.3.6 Builtins ........................................................................................................ 35

4.3.7 Profiles ........................................................................................................ 35

5 Detailed block definition ................................................................................................ 35

5.1 General ................................................................................................................. 35

5.2 Application FBs ..................................................................................................... 35

5.2.1 Analog Input FB ........................................................................................... 35

5.2.2 Analog Output FB ........................................................................................ 37

5.2.3 Discrete Input FB ......................................................................................... 38

5.2.4 On/Off Actuation FB Discrete Output FB ...................................................... 40

5.2.5 Calculation FB ............................................................................................. 41

5.2.6 Control FB ................................................................................................... 42

5.3 Component FBs .................................................................................................... 44

5.4 Technology Block .................................................................................................. 44

5.4.1 Temperature Technology Block .................................................................... 44

5.4.2 Pressure Technology Block .......................................................................... 47

5.4.3 Modulating Actuation Technology Block ....................................................... 49

---------------------- Page: 8 ----------------------
SIST EN IEC 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 3 –

5.4.4 On/Off Actuation Technology Block .............................................................. 51

5.5 Device (Resource) Block ....................................................................................... 54

5.5.1 Identification ................................................................................................ 54

5.5.2 Device state ................................................................................................. 54

5.5.3 Message ...................................................................................................... 56

5.5.4 Initialisation ................................................................................................. 56

5.6 Algorithms common to all blocks ........................................................................... 56

5.6.1 Data Input/Data Output status ...................................................................... 56

5.6.2 Validity ........................................................................................................ 57

5.6.3 Restart Initialisation ..................................................................................... 57

5.6.4 Fail-safe ...................................................................................................... 57

5.6.5 Remote Cascade Initialisation ...................................................................... 58

6 FB Environment ............................................................................................................. 58

7 Mapping to System Management ................................................................................... 58

8 Mapping to Communication ........................................................................................... 59

Annex A (informative) Parameter description ....................................................................... 62

Annex B (informative) Compatibility levels ........................................................................... 68

B.1 General ................................................................................................................. 68

B.2 Compatibility ......................................................................................................... 69

B.3 Incompatibility ....................................................................................................... 69

B.4 Coexistence .......................................................................................................... 70

B.5 Interconnectability ................................................................................................. 70

B.6 Interworkability ..................................................................................................... 70

B.7 Interoperability ...................................................................................................... 70

B.8 Interchangeability ................................................................................................. 71

Annex C (informative) Proxy concept and its use in FB applications ..................................... 72

C.1 General proxy concept .......................................................................................... 72

C.2 Use of the proxy concept in FB applications .......................................................... 73

Bibliography .......................................................................................................................... 75

Figure 1 – Position of IEC 61804-2 related to other standards and products ........................... 7

Figure 2 – FB structure is derived out of the process (P&ID view) ......................................... 20

Figure 3 – FB structure may be distributed between devices (according to IEC 61499-

1) ...................................................................................................................................... 21

Figure 4 – IEC 61804 FBs can be implemented in different devices ...................................... 22

Figure 5 – General components of devices ........................................................................... 22

Figure 6 – Block types of IEC 61804 (all parts) ..................................................................... 23

Figure 7 – IEC 61804 block overview (graphical representation not normative) ..................... 24

Figure 8 – UML class diagram of the device model ............................................................... 27

Figure 9 – Measurement process signal flow ......................................................................... 31

Figure 10 – Actuation process signal flow ............................................................................. 31

Figure 11 – Application process signal flow ........................................................................... 32

Figure 12 – EDD generation process .................................................................................... 34

Figure 13 – Analog Input FB ................................................................................................. 36

Figure 14 – Analog Output FB ............................................................................................... 37

Figure 15 – Discrete input FB ............................................................................................... 39

---------------------- Page: 9 ----------------------
SIST EN IEC 61804-2:2018
– 4 – IEC 61804-2:2018  IEC 2018

Figure 16 – Discrete Output FB ............................................................................................. 40

Figure 17 – Calculation FB .................................................................................................... 42

Figure 18 – Control FB .......................................................................................................... 43

Figure 19 – Temperature Technology Block .......................................................................... 44

Figure 20 – Pressure Technology Block ................................................................................ 48

Figure 21 – Modulating Actuation Technology Block ............................................................. 50

Figure 22 – On/Off Actuation Technology Block .................................................................... 52

Figure 23 – Harel state chart ................................................................................................ 55

Figure 24 – Application structure of ISO OSI Reference Model ............................................. 59

Figure 25 – Client/Server relationship in terms of OSI Reference Model ............................... 60

Figure 26 – Mapping of IEC 61804 FBs to APOs ................................................................... 60

Figure B.1 – Levels of functional device compatibility ........................................................... 68

Figure C.1 – Proxy model class diagram ............................................................................... 72

Figure C.2 – Proxy integration in DCS .................................................................................. 73

Table 1 – Field attribute descriptions .................................................................................... 19

Table 2 – Equivalences between IEC 61804 and IEC 61499 model elements ........................ 26

Table 3 – Variables and parameter description template ....................................................... 29

Table 4 – Example of temperature sensors of Sensor_Type .................................................. 46

Table 5 – Device status state table ....................................................................................... 54

Table 6 – Device status transition table ................................................................................ 56

Table A.1 – Parameter description ........................................................................................ 62

Table B.1 – Functionality features ......................................................................................... 69

---------------------- Page: 10 ----------------------
SIST EN IEC 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTION BLOCKS (FB) FOR PROCESS CONTROL AND
ELECTRONIC DEVICE DESCRIPTION LANGUAGE (EDDL) –
Part 2: Specification of FB concept
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61804-2 has been prepared by subcommittee 65E: Devices and

integration in enterprice systems, of IEC technical committee 65: Industrial-process

measurement, control and automation.

This third edition cancels and replaces the second edition published in 2006 and integrates

parts of IEC 61804-1 which was withdrawn in January 2013. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) added command communication mapping in Clause 8;

b) moved and reword compatibility level definition from IEC 62804-1 to new Annex B and

terms and definitions;
---------------------- Page: 11 ----------------------
SIST EN IEC 61804-2:2018
– 6 – IEC 61804-2:2018  IEC 2018
c) added proxy concept in new Annex C.
The text of this standard is based on the following documents:
FDIS Report on voting
65E/567/FDIS 65E/576/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61804 series, published under the general title Function blocks

(FB) for process control and electronic device description language (EDDL), can be found on

the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 12 ----------------------
SIST EN IEC 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 7 –
INTRODUCTION

This part of IEC 61804 provides a conceptual function block (FB) specification, which can be

mapped to specific communication systems and their accompanying definitions by industrial

groups.

The EDDL fills the gap between the conceptual FB specification of this document and a

product implementation. Figure 1 shows these aspects.
Conceptual FB
IEC 61804 Electronic
specification for
IEC 61804 Function block concept
device description
the process
Part 2
sector
Solutions
Other
ControlNet
Foundation
PROFIBUS
(technology)
PA profile
profile
application
BBB
specification
Implementation
EDD
Products
IEC
Figure 1 – Position of IEC 61804-2 related to other standards and products

The International Electrotechnical Commission (IEC) draws attention to the fact that it is

claimed that compliance with this document may involve the use of patents
U.S. Patent No. 5,333,114
U.S. Patent No. 5,485,400
U.S. Patent No. 5,825,664
U.S. Patent No. 5,909,368
U.S. Patent Pending No. 08/916,178
Australian Patent No. 638507
Canadian Patent No. 2,066,743
European Patent No. 0495001
Validated in:
UK – Patent No. 0495001
France – Patent No. 0495001
Germany – Patent No. 69032954.7
Netherlands – Patent No. 0495001
Japan – Patent No. 3137643

IEC take no position concerning the evidence, validity and scope of this patent right. The

holder of this patent right has assured the IEC that he is willing to negotiate licenses under

reasonable and non-discriminatory terms and conditions with applicants throughout the world.

In this respect, the statement of the holder of this patent right is registered with IEC.

Information may be obtained from:
Language
Part 3
Design rules
Part 4
Language builtins
Part 5
Requirements for
integrating fieldbus
devices - Part 6
---------------------- Page: 13 ----------------------
SIST EN IEC 61804-2:2018
– 8 – IEC 61804-2:2018  IEC 2018
FieldComm Group Inc.,
9430 Research Boulevard, Suite 1-120,
Austin, Texas, USA 78759,
Attention: President.

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights other than those identified above. IEC shall not be held responsible for

identifying any or all such patent rights.

ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of

patents relevant to their standards. Users are encouraged to consult the data bases for the

most up to date information concerning patents.

The IEC 61804 series has the general title "Function blocks (FB) for process control and

electronic device description language (EDDL)" and consists of the following parts:

Part 2: FB concept
Part 3: Electronic device description language (EDDL)
Part 4: EDD design rules
Part 5: EDDL Builtin libra
...

SLOVENSKI STANDARD
SIST EN 61804-2:2018
01-junij-2018
Nadomešča:
SIST EN 61804-2:2007
Funkcijski bloki (FB) za nadzor procesov in opisni jezik za elektronske naprave
(EDDL) - 2. del: Specifikacija koncepta FB (IEC 61804-2:2018)

Function blocks (FB) for process control and electronic device description language

(EDDL) - Part 2: Specification of FB concept (IEC 61804-2:2018)
Funktionsbausteine für die Prozessautomation und elektronische

Gerätebeschreibungssprache - Teil 2: Festlegung des Funktionsbausteinkonzepts (IEC

61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le langage de description

électronique du produit (EDDL) - Partie 2: Spécification du concept de FB (IEC 61804-

2:2018)
Ta slovenski standard je istoveten z: EN IEC 61804-2:2018
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.060 Jeziki, ki se uporabljajo v Languages used in
informacijski tehniki in information technology
tehnologiji
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
SIST EN 61804-2:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61804-2:2018
---------------------- Page: 2 ----------------------
SIST EN 61804-2:2018
EUROPEAN STANDARD EN IEC 61804-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 25.040.40; 35.240.50 Supersedes EN 61804-2:2007
English Version
Function blocks (FB) for process control and electronic device
description language (EDDL) - Part 2: Specification of FB
concept
(IEC 61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le Funktionsbausteine für die Prozessautomation und

langage de description électronique du produit (EDDL) - elektronische Gerätebeschreibungssprache - Teil 2:

Partie 2: Spécification du concept de FB Festlegung des Funktionsbausteinkonzepts

(IEC 61804-2:2018) (IEC 61804-2:2018)

This European Standard was approved by CENELEC on 2018-02-14. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61804-2:2018 E
---------------------- Page: 3 ----------------------
SIST EN 61804-2:2018
EN IEC 61804-2:2018 (E)
European foreword

The text of document 65E/567/FDIS, future edition 3 of IEC 61804-2, prepared by IEC/SC 65E

"Devices and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement,

control and automation" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 61804-2:2018.
The following dates are fixed:
(dop) 2018-11-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-02-14
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61804-2:2007.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61804-2:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60854-1 NOTE Harmonized as EN 60854-1.
IEC 61131-3 NOTE Harmonized as EN 61131-3.
IEC 61804 series NOTE Harmonized as EN 61804 series.
IEC 61804-3 NOTE Harmonized as EN 61804-3.
IEC 61804-5 NOTE Harmonized as EN 61804-5.
---------------------- Page: 4 ----------------------
SIST EN 61804-2:2018
EN IEC 61804-2:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61158 series Industrial communication networks - EN 61158 series
Fieldbus specifications - Part 1: Overview
and guidance for the IEC 61158 and IEC
61784 series
IEC 61499-1 2012 Function blocks -- Part 1: Architecture EN 61499-1 2013
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
---------------------- Page: 5 ----------------------
SIST EN 61804-2:2018
---------------------- Page: 6 ----------------------
SIST EN 61804-2:2018
IEC 61804-2
Edition 3.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Function blocks (FB) for process control and electronic device description
language (EDDL) –
Part 2: Specification of FB concept
Blocs fonctionnels (FB) pour les procédés industriels et langage de description
electronique de produit (EDDL) –
Partie 2: Spécification du concept de FB
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-5128-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 61804-2:2018
– 2 – IEC 61804-2:2018  IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, abbreviated terms and conventions .................................................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................. 18

3.3 Conventions for lexical structures ......................................................................... 19

4 General function block (FB) definition and EDD model ................................................... 20

4.1 Device structure (device model) ............................................................................ 20

4.1.1 Device model description ............................................................................. 20

4.1.2 FB type ........................................................................................................ 23

4.1.3 FB execution ................................................................................................ 25

4.1.4 Reference between IEC 61499 and IEC 61804 models ................................ 26

4.1.5 UML specification of the device model ......................................................... 26

4.1.6 Classification of the algorithms .................................................................... 28

4.1.7 Algorithm description ................................................................................... 29

4.1.8 Input and output variables and parameter definition ..................................... 29

4.1.9 Choice of variables and parameters ............................................................. 30

4.1.10 Mode, Status and Diagnosis ........................................................................ 30

4.2 Block combinations ............................................................................................... 30

4.2.1 Measurement channel .................................................................................. 30

4.2.2 Actuation channel ........................................................................................ 31

4.2.3 Application ................................................................................................... 32

4.3 EDD and EDDL model........................................................................................... 32

4.3.1 Overview of EDD and EDDL ........................................................................ 32

4.3.2 EDD architecture ......................................................................................... 33

4.3.3 Concepts of EDD ......................................................................................... 33

4.3.4 Principles of the EDD development process ................................................. 33

4.3.5 Interrelations between the lexical structure and formal definitions ................ 34

4.3.6 Builtins ........................................................................................................ 35

4.3.7 Profiles ........................................................................................................ 35

5 Detailed block definition ................................................................................................ 35

5.1 General ................................................................................................................. 35

5.2 Application FBs ..................................................................................................... 35

5.2.1 Analog Input FB ........................................................................................... 35

5.2.2 Analog Output FB ........................................................................................ 37

5.2.3 Discrete Input FB ......................................................................................... 38

5.2.4 On/Off Actuation FB Discrete Output FB ...................................................... 40

5.2.5 Calculation FB ............................................................................................. 41

5.2.6 Control FB ................................................................................................... 42

5.3 Component FBs .................................................................................................... 44

5.4 Technology Block .................................................................................................. 44

5.4.1 Temperature Technology Block .................................................................... 44

5.4.2 Pressure Technology Block .......................................................................... 47

5.4.3 Modulating Actuation Technology Block ....................................................... 49

---------------------- Page: 8 ----------------------
SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 3 –

5.4.4 On/Off Actuation Technology Block .............................................................. 51

5.5 Device (Resource) Block ....................................................................................... 54

5.5.1 Identification ................................................................................................ 54

5.5.2 Device state ................................................................................................. 54

5.5.3 Message ...................................................................................................... 56

5.5.4 Initialisation ................................................................................................. 56

5.6 Algorithms common to all blocks ........................................................................... 56

5.6.1 Data Input/Data Output status ...................................................................... 56

5.6.2 Validity ........................................................................................................ 57

5.6.3 Restart Initialisation ..................................................................................... 57

5.6.4 Fail-safe ...................................................................................................... 57

5.6.5 Remote Cascade Initialisation ...................................................................... 58

6 FB Environment ............................................................................................................. 58

7 Mapping to System Management ................................................................................... 58

8 Mapping to Communication ........................................................................................... 59

Annex A (informative) Parameter description ....................................................................... 62

Annex B (informative) Compatibility levels ........................................................................... 68

B.1 General ................................................................................................................. 68

B.2 Compatibility ......................................................................................................... 69

B.3 Incompatibility ....................................................................................................... 69

B.4 Coexistence .......................................................................................................... 70

B.5 Interconnectability ................................................................................................. 70

B.6 Interworkability ..................................................................................................... 70

B.7 Interoperability ...................................................................................................... 70

B.8 Interchangeability ................................................................................................. 71

Annex C (informative) Proxy concept and its use in FB applications ..................................... 72

C.1 General proxy concept .......................................................................................... 72

C.2 Use of the proxy concept in FB applications .......................................................... 73

Bibliography .......................................................................................................................... 75

Figure 1 – Position of IEC 61804-2 related to other standards and products ........................... 7

Figure 2 – FB structure is derived out of the process (P&ID view) ......................................... 20

Figure 3 – FB structure may be distributed between devices (according to IEC 61499-

1) ...................................................................................................................................... 21

Figure 4 – IEC 61804 FBs can be implemented in different devices ...................................... 22

Figure 5 – General components of devices ........................................................................... 22

Figure 6 – Block types of IEC 61804 (all parts) ..................................................................... 23

Figure 7 – IEC 61804 block overview (graphical representation not normative) ..................... 24

Figure 8 – UML class diagram of the device model ............................................................... 27

Figure 9 – Measurement process signal flow ......................................................................... 31

Figure 10 – Actuation process signal flow ............................................................................. 31

Figure 11 – Application process signal flow ........................................................................... 32

Figure 12 – EDD generation process .................................................................................... 34

Figure 13 – Analog Input FB ................................................................................................. 36

Figure 14 – Analog Output FB ............................................................................................... 37

Figure 15 – Discrete input FB ............................................................................................... 39

---------------------- Page: 9 ----------------------
SIST EN 61804-2:2018
– 4 – IEC 61804-2:2018  IEC 2018

Figure 16 – Discrete Output FB ............................................................................................. 40

Figure 17 – Calculation FB .................................................................................................... 42

Figure 18 – Control FB .......................................................................................................... 43

Figure 19 – Temperature Technology Block .......................................................................... 44

Figure 20 – Pressure Technology Block ................................................................................ 48

Figure 21 – Modulating Actuation Technology Block ............................................................. 50

Figure 22 – On/Off Actuation Technology Block .................................................................... 52

Figure 23 – Harel state chart ................................................................................................ 55

Figure 24 – Application structure of ISO OSI Reference Model ............................................. 59

Figure 25 – Client/Server relationship in terms of OSI Reference Model ............................... 60

Figure 26 – Mapping of IEC 61804 FBs to APOs ................................................................... 60

Figure B.1 – Levels of functional device compatibility ........................................................... 68

Figure C.1 – Proxy model class diagram ............................................................................... 72

Figure C.2 – Proxy integration in DCS .................................................................................. 73

Table 1 – Field attribute descriptions .................................................................................... 19

Table 2 – Equivalences between IEC 61804 and IEC 61499 model elements ........................ 26

Table 3 – Variables and parameter description template ....................................................... 29

Table 4 – Example of temperature sensors of Sensor_Type .................................................. 46

Table 5 – Device status state table ....................................................................................... 54

Table 6 – Device status transition table ................................................................................ 56

Table A.1 – Parameter description ........................................................................................ 62

Table B.1 – Functionality features ......................................................................................... 69

---------------------- Page: 10 ----------------------
SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTION BLOCKS (FB) FOR PROCESS CONTROL AND
ELECTRONIC DEVICE DESCRIPTION LANGUAGE (EDDL) –
Part 2: Specification of FB concept
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61804-2 has been prepared by subcommittee 65E: Devices and

integration in enterprice systems, of IEC technical committee 65: Industrial-process

measurement, control and automation.

This third edition cancels and replaces the second edition published in 2006 and integrates

parts of IEC 61804-1 which was withdrawn in January 2013. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) added command communication mapping in Clause 8;

b) moved and reword compatibility level definition from IEC 62804-1 to new Annex B and

terms and definitions;
---------------------- Page: 11 ----------------------
SIST EN 61804-2:2018
– 6 – IEC 61804-2:2018  IEC 2018
c) added proxy concept in new Annex C.
The text of this standard is based on the following documents:
FDIS Report on voting
65E/567/FDIS 65E/576/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61804 series, published under the general title Function blocks

(FB) for process control and electronic device description language (EDDL), can be found on

the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 12 ----------------------
SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 7 –
INTRODUCTION

This part of IEC 61804 provides a conceptual function block (FB) specification, which can be

mapped to specific communication systems and their accompanying definitions by industrial

groups.

The EDDL fills the gap between the conceptual FB specification of this document and a

product implementation. Figure 1 shows these aspects.
Conceptual FB
IEC 61804 Electronic
specification for
IEC 61804 Function block concept
device description
the process
Part 2
sector
Solutions
Other
ControlNet
Foundation
PROFIBUS
(technology)
PA profile
profile
application
BBB
specification
Implementation
EDD
Products
IEC
Figure 1 – Position of IEC 61804-2 related to other standards and products

The International Electrotechnical Commission (IEC) draws attention to the fact that it is

claimed that compliance with this document may involve the use of patents
U.S. Patent No. 5,333,114
U.S. Patent No. 5,485,400
U.S. Patent No. 5,825,664
U.S. Patent No. 5,909,368
U.S. Patent Pending No. 08/916,178
Australian Patent No. 638507
Canadian Patent No. 2,066,743
European Patent No. 0495001
Validated in:
UK – Patent No. 0495001
France – Patent No. 0495001
Germany – Patent No. 69032954.7
Netherlands – Patent No. 0495001
Japan – Patent No. 3137643

IEC take no position concerning the evidence, validity and scope of this patent right. The

holder of this patent right has assured the IEC that he is willing to negotiate licenses under

reasonable and non-discriminatory terms and conditions with applicants throughout the world.

In this respect, the statement of the holder of this patent right is registered with IEC.

Information may be obtained from:
Language
Part 3
Design rules
Part 4
Language builtins
Part 5
Requirements for
integrating fieldbus
devices - Part 6
---------------------- Page: 13 ----------------------
SIST EN 61804-2:2018
– 8 – IEC 61804-2:2018  IEC 2018
FieldComm Group Inc.,
9430 Research Boulevard, Suite 1-120,
Austin, Texas, USA 78759,
Attention: President.

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights other than those identified above. IEC shall not be held responsible for

identifying any or all such patent rights.

ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of

patents relevant to their standards. Users are encouraged to consult the data bases for the

most up to date information concerning patents.

The IEC 61804 series has the general title "Function blocks (FB) for process control and

electronic device description language (EDDL)" and consists of the following parts:

Part 2: FB concept
Part 3: Electronic device description language (EDDL)
Part 4: EDD design rules
Part 5: EDDL Builtin library
Part 6: Meeting the requirements for integrating field
...

SLOVENSKI STANDARD
SIST EN 61804-2:2018
01-junij-2018
1DGRPHãþD
SIST EN 61804-2:2007
Funkcijski bloki (FB) za nadzor procesov in opisni jezik za elektronske naprave
(EDDL) - 2. del: Specifikacija koncepta FB (IEC 61804-2:2018)

Function blocks (FB) for process control and electronic device description language

(EDDL) - Part 2: Specification of FB concept (IEC 61804-2:2018)
Funktionsbausteine für die Prozessautomation und elektronische

Gerätebeschreibungssprache - Teil 2: Festlegung des Funktionsbausteinkonzepts (IEC

61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le langage de description

électronique du produit (EDDL) - Partie 2: Spécification du concept de FB (IEC 61804-

2:2018)
Ta slovenski standard je istoveten z: EN IEC 61804-2:2018
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
SIST EN 61804-2:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61804-2:2018
---------------------- Page: 2 ----------------------
SIST EN 61804-2:2018
EUROPEAN STANDARD EN IEC 61804-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 25.040.40; 35.240.50 Supersedes EN 61804-2:2007
English Version
Function blocks (FB) for process control and electronic device
description language (EDDL) - Part 2: Specification of FB
concept
(IEC 61804-2:2018)

Blocs fonctionnels (FB) pour les procédés industriels et le Funktionsbausteine für die Prozessautomation und

langage de description électronique du produit (EDDL) - elektronische Gerätebeschreibungssprache - Teil 2:

Partie 2: Spécification du concept de FB Festlegung des Funktionsbausteinkonzepts

(IEC 61804-2:2018) (IEC 61804-2:2018)

This European Standard was approved by CENELEC on 2018-02-14. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61804-2:2018 E
---------------------- Page: 3 ----------------------
SIST EN 61804-2:2018
EN IEC 61804-2:2018 (E)
European foreword

The text of document 65E/567/FDIS, future edition 3 of IEC 61804-2, prepared by IEC/SC 65E

"Devices and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement,

control and automation" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 61804-2:2018.
The following dates are fixed:
(dop) 2018-11-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-02-14
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61804-2:2007.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61804-2:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60854-1 NOTE Harmonized as EN 60854-1.
IEC 61131-3 NOTE Harmonized as EN 61131-3.
IEC 61804 series NOTE Harmonized as EN 61804 series.
IEC 61804-3 NOTE Harmonized as EN 61804-3.
IEC 61804-5 NOTE Harmonized as EN 61804-5.
---------------------- Page: 4 ----------------------
SIST EN 61804-2:2018
EN IEC 61804-2:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61158 series Industrial communication networks - EN 61158 series
Fieldbus specifications - Part 1: Overview
and guidance for the IEC 61158 and IEC
61784 series
IEC 61499-1 2012 Function blocks -- Part 1: Architecture EN 61499-1 2013
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
---------------------- Page: 5 ----------------------
SIST EN 61804-2:2018
---------------------- Page: 6 ----------------------
SIST EN 61804-2:2018
IEC 61804-2
Edition 3.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Function blocks (FB) for process control and electronic device description
language (EDDL) –
Part 2: Specification of FB concept
Blocs fonctionnels (FB) pour les procédés industriels et langage de description
electronique de produit (EDDL) –
Partie 2: Spécification du concept de FB
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-5128-7

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SIST EN 61804-2:2018
– 2 – IEC 61804-2:2018  IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, abbreviated terms and conventions .................................................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................. 18

3.3 Conventions for lexical structures ......................................................................... 19

4 General function block (FB) definition and EDD model ................................................... 20

4.1 Device structure (device model) ............................................................................ 20

4.1.1 Device model description ............................................................................. 20

4.1.2 FB type ........................................................................................................ 23

4.1.3 FB execution ................................................................................................ 25

4.1.4 Reference between IEC 61499 and IEC 61804 models ................................ 26

4.1.5 UML specification of the device model ......................................................... 26

4.1.6 Classification of the algorithms .................................................................... 28

4.1.7 Algorithm description ................................................................................... 29

4.1.8 Input and output variables and parameter definition ..................................... 29

4.1.9 Choice of variables and parameters ............................................................. 30

4.1.10 Mode, Status and Diagnosis ........................................................................ 30

4.2 Block combinations ............................................................................................... 30

4.2.1 Measurement channel .................................................................................. 30

4.2.2 Actuation channel ........................................................................................ 31

4.2.3 Application ................................................................................................... 32

4.3 EDD and EDDL model........................................................................................... 32

4.3.1 Overview of EDD and EDDL ........................................................................ 32

4.3.2 EDD architecture ......................................................................................... 33

4.3.3 Concepts of EDD ......................................................................................... 33

4.3.4 Principles of the EDD development process ................................................. 33

4.3.5 Interrelations between the lexical structure and formal definitions ................ 34

4.3.6 Builtins ........................................................................................................ 35

4.3.7 Profiles ........................................................................................................ 35

5 Detailed block definition ................................................................................................ 35

5.1 General ................................................................................................................. 35

5.2 Application FBs ..................................................................................................... 35

5.2.1 Analog Input FB ........................................................................................... 35

5.2.2 Analog Output FB ........................................................................................ 37

5.2.3 Discrete Input FB ......................................................................................... 38

5.2.4 On/Off Actuation FB Discrete Output FB ...................................................... 40

5.2.5 Calculation FB ............................................................................................. 41

5.2.6 Control FB ................................................................................................... 42

5.3 Component FBs .................................................................................................... 44

5.4 Technology Block .................................................................................................. 44

5.4.1 Temperature Technology Block .................................................................... 44

5.4.2 Pressure Technology Block .......................................................................... 47

5.4.3 Modulating Actuation Technology Block ....................................................... 49

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SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 3 –

5.4.4 On/Off Actuation Technology Block .............................................................. 51

5.5 Device (Resource) Block ....................................................................................... 54

5.5.1 Identification ................................................................................................ 54

5.5.2 Device state ................................................................................................. 54

5.5.3 Message ...................................................................................................... 56

5.5.4 Initialisation ................................................................................................. 56

5.6 Algorithms common to all blocks ........................................................................... 56

5.6.1 Data Input/Data Output status ...................................................................... 56

5.6.2 Validity ........................................................................................................ 57

5.6.3 Restart Initialisation ..................................................................................... 57

5.6.4 Fail-safe ...................................................................................................... 57

5.6.5 Remote Cascade Initialisation ...................................................................... 58

6 FB Environment ............................................................................................................. 58

7 Mapping to System Management ................................................................................... 58

8 Mapping to Communication ........................................................................................... 59

Annex A (informative) Parameter description ....................................................................... 62

Annex B (informative) Compatibility levels ........................................................................... 68

B.1 General ................................................................................................................. 68

B.2 Compatibility ......................................................................................................... 69

B.3 Incompatibility ....................................................................................................... 69

B.4 Coexistence .......................................................................................................... 70

B.5 Interconnectability ................................................................................................. 70

B.6 Interworkability ..................................................................................................... 70

B.7 Interoperability ...................................................................................................... 70

B.8 Interchangeability ................................................................................................. 71

Annex C (informative) Proxy concept and its use in FB applications ..................................... 72

C.1 General proxy concept .......................................................................................... 72

C.2 Use of the proxy concept in FB applications .......................................................... 73

Bibliography .......................................................................................................................... 75

Figure 1 – Position of IEC 61804-2 related to other standards and products ........................... 7

Figure 2 – FB structure is derived out of the process (P&ID view) ......................................... 20

Figure 3 – FB structure may be distributed between devices (according to IEC 61499-

1) ...................................................................................................................................... 21

Figure 4 – IEC 61804 FBs can be implemented in different devices ...................................... 22

Figure 5 – General components of devices ........................................................................... 22

Figure 6 – Block types of IEC 61804 (all parts) ..................................................................... 23

Figure 7 – IEC 61804 block overview (graphical representation not normative) ..................... 24

Figure 8 – UML class diagram of the device model ............................................................... 27

Figure 9 – Measurement process signal flow ......................................................................... 31

Figure 10 – Actuation process signal flow ............................................................................. 31

Figure 11 – Application process signal flow ........................................................................... 32

Figure 12 – EDD generation process .................................................................................... 34

Figure 13 – Analog Input FB ................................................................................................. 36

Figure 14 – Analog Output FB ............................................................................................... 37

Figure 15 – Discrete input FB ............................................................................................... 39

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SIST EN 61804-2:2018
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Figure 16 – Discrete Output FB ............................................................................................. 40

Figure 17 – Calculation FB .................................................................................................... 42

Figure 18 – Control FB .......................................................................................................... 43

Figure 19 – Temperature Technology Block .......................................................................... 44

Figure 20 – Pressure Technology Block ................................................................................ 48

Figure 21 – Modulating Actuation Technology Block ............................................................. 50

Figure 22 – On/Off Actuation Technology Block .................................................................... 52

Figure 23 – Harel state chart ................................................................................................ 55

Figure 24 – Application structure of ISO OSI Reference Model ............................................. 59

Figure 25 – Client/Server relationship in terms of OSI Reference Model ............................... 60

Figure 26 – Mapping of IEC 61804 FBs to APOs ................................................................... 60

Figure B.1 – Levels of functional device compatibility ........................................................... 68

Figure C.1 – Proxy model class diagram ............................................................................... 72

Figure C.2 – Proxy integration in DCS .................................................................................. 73

Table 1 – Field attribute descriptions .................................................................................... 19

Table 2 – Equivalences between IEC 61804 and IEC 61499 model elements ........................ 26

Table 3 – Variables and parameter description template ....................................................... 29

Table 4 – Example of temperature sensors of Sensor_Type .................................................. 46

Table 5 – Device status state table ....................................................................................... 54

Table 6 – Device status transition table ................................................................................ 56

Table A.1 – Parameter description ........................................................................................ 62

Table B.1 – Functionality features ......................................................................................... 69

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SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTION BLOCKS (FB) FOR PROCESS CONTROL AND
ELECTRONIC DEVICE DESCRIPTION LANGUAGE (EDDL) –
Part 2: Specification of FB concept
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61804-2 has been prepared by subcommittee 65E: Devices and

integration in enterprice systems, of IEC technical committee 65: Industrial-process

measurement, control and automation.

This third edition cancels and replaces the second edition published in 2006 and integrates

parts of IEC 61804-1 which was withdrawn in January 2013. This edition constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) added command communication mapping in Clause 8;

b) moved and reword compatibility level definition from IEC 62804-1 to new Annex B and

terms and definitions;
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SIST EN 61804-2:2018
– 6 – IEC 61804-2:2018  IEC 2018
c) added proxy concept in new Annex C.
The text of this standard is based on the following documents:
FDIS Report on voting
65E/567/FDIS 65E/576/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61804 series, published under the general title Function blocks

(FB) for process control and electronic device description language (EDDL), can be found on

the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN 61804-2:2018
IEC 61804-2:2018 © IEC 2018 – 7 –
INTRODUCTION

This part of IEC 61804 provides a conceptual function block (FB) specification, which can be

mapped to specific communication systems and their accompanying definitions by industrial

groups.

The EDDL fills the gap between the conceptual FB specification of this document and a

product implementation. Figure 1 shows these aspects.
Conceptual FB
IEC 61804 Electronic
specification for
IEC 61804 Function block concept
device description
the process
Part 2
sector
Solutions
Other
ControlNet
Foundation
PROFIBUS
(technology)
PA profile
profile
application
BBB
specification
Implementation
EDD
Products
IEC
Figure 1 – Position of IEC 61804-2 related to other standards and products

The International Electrotechnical Commission (IEC) draws attention to the fact that it is

claimed that compliance with this document may involve the use of patents
U.S. Patent No. 5,333,114
U.S. Patent No. 5,485,400
U.S. Patent No. 5,825,664
U.S. Patent No. 5,909,368
U.S. Patent Pending No. 08/916,178
Australian Patent No. 638507
Canadian Patent No. 2,066,743
European Patent No. 0495001
Validated in:
UK – Patent No. 0495001
France – Patent No. 0495001
Germany – Patent No. 69032954.7
Netherlands – Patent No. 0495001
Japan – Patent No. 3137643

IEC take no position concerning the evidence, validity and scope of this patent right. The

holder of this patent right has assured the IEC that he is willing to negotiate licenses under

reasonable and non-discriminatory terms and conditions with applicants throughout the world.

In this respect, the statement of the holder of this patent right is registered with IEC.

Information may be obtained from:
Language
Part 3
Design rules
Part 4
Language builtins
Part 5
Requirements for
integrating fieldbus
devices - Part 6
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SIST EN 61804-2:2018
– 8 – IEC 61804-2:2018  IEC 2018
FieldComm Group Inc.,
9430 Research Boulevard, Suite 1-120,
Austin, Texas, USA 78759,
Attention: President.

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights other than those identified above. IEC shall not be held responsible for

identifying any or all such patent rights.

ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of

patents relevant to their standards. Users are encouraged to consult the data bases for the

most up to date information concerning patents.

The IEC 61804 series has the general title "Function blocks (FB) for process control and

electronic device description language (EDDL)" and consists of the following parts:

Part 2: FB concept
Part 3: Electronic device description language (EDDL)
Part 4: EDD design rules
Part 5: EDDL Builtin library

Part 6: Meeting the requirements for integrating fieldbus devices in engineering tools for field

devices
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...

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