Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements

IEC 61158-6-4:2019 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This International Standard specifies interactions between remote applications and defines the externally visible behavior provided by the Type 2 fieldbus application layer. The purpose of this document is to define the protocol provided to a) define the wire-representation of the service primitives defined in this document, and b) define the externally visible behavior associated with their transfer. This document specifies the protocol of the Type 2 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545). This third edition includes the following significant technical changes with respect to the previous edition: a) additional user parameters to services; b) additional services to support distributed objects; c) additional secure services.

Industrielle Kommunikationsnetze - Feldbusse - Teil 6-4: Protokollspezifikation des Application Layer (Anwendungsschicht) - Typ 4-Elemente

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-4: Spécification du protocole de la couche application - Eléments de type 4

l’IEC 61158-6-4:2019 fournit des éléments communs pour les communications à temps critique ou non entre des programmes d’application dans un environnement et avec un matériel d’automation spécifiques aux bus de terrain de type 4. Le terme "en temps critique" signale l'existence d'une fenêtre temporelle dans laquelle des actions spécifiées doivent être exécutées, avec un niveau de certitude défini. La non-réalisation des actions spécifiées dans la fenêtre temporelle induit un risque de défaillance des applications qui demandent ces actions, avec les risques relatifs à l'équipement, les installations et éventuellement la vie humaine. La présente norme internationale spécifie les interactions entre les applications distantes et définit le comportement, visible par un observateur externe, assuré par la couche Application de bus de terrain de type 4, en termes a) de syntaxe abstraite formelle définissant les unités de données de protocole de couche Application, acheminées entre les entités d'application en communication; b) de syntaxe de transfert définissant les règles de codage qui s'appliquent aux unités de données de protocole de couche Application; c) de diagramme d'états de contexte d'application définissant le comportement de service d'application observable entre les entités d'application en communication; d) de diagrammes d'états de relations d'applications définissant le comportement de communication visible entre les entités d'application en communication.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 6-4. del: Specifikacija protokola na aplikacijski ravni - Elementi tipa 4 (IEC 61158-6-4:2019)

Ta dokument določa skupne elemente za osnovne časovno kritične in časovno nekritične sporočilne komunikacije med aplikacijami v avtomatizacijskem okolju ter materialu, specifičnem za procesna vodila tipa 4. Izraz »časovno kritičen« se uporablja za predstavitev prisotnosti časovnega okna, v okviru katerega se zahteva dokončanje enega ali več opredeljenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja opredeljenih dejanj v časovnem oknu je možna odpoved aplikacij, ki zahtevajo dejanja, pri čemer so ogroženi oprema, obrat in morda človeška življenja. Ta mednarodni standard opredeljuje interakcije med oddaljenimi aplikacijami in določa zunanje vidno vedenje, ki ga zagotavlja aplikacijski nivo procesnih vodil tipa 4 v zvezi s/z: a) formalno abstraktno sintakso, ki opredeljuje podatkovne enote protokola aplikacijskega nivoja, ki se prenašajo med aplikacijskimi osebki, ki komunicirajo, b) prenosno sintakso, ki opredeljuje pravila kodiranja, ki se uporabljajo za podatkovne enote protokola aplikacijskega nivoja, c) strojem stanj aplikacijskega konteksta, ki opredeljuje vedenje aplikacijskega opravila, vidnega med aplikacijskimi osebki, ki komunicirajo, in d) stroji stanj aplikacijskega razmerja, ki opredeljujejo komunikacijsko vedenje med aplikacijskimi osebki, ki komunicirajo. Namen tega dokumenta je opredeliti protokol za: 1) določitev prikaza primitivov opravil iz standarda IEC 61158-5-4 in 2) določitev zunanje vidnega vedenja, povezanega z njihovim prenosom. Ta dokument določa protokol aplikacijskega nivoja procesnih vodil tipa 4 v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498-1) in strukturo aplikacijskega nivoja OSI (ISO/IEC 9545).

General Information

Status
Published
Publication Date
22-Aug-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
23-Aug-2019
Completion Date
23-Aug-2019

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SLOVENSKI STANDARD
SIST EN IEC 61158-6-4:2019
01-november-2019
Nadomešča:
SIST EN 61158-6-4:2015

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 6-4. del:

Specifikacija protokola na aplikacijski ravni - Elementi tipa 4 (IEC 61158-6-4:2019)

Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer

protocol specification - Type 4 elements (IEC 61158-6-4:2019)

Industrielle Kommunikationsnetze - Feldbusse - Teil 6-4: Protokollspezifikation des

Application Layer (Anwendungsschicht) - Typ 4-Elemente (IEC 61158-6-4:2019)

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-4:

Spécification du protocole de la couche application - Eléments de type 4 (IEC 61158-6-

4:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-6-4:2019
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.70 Uporabniški sloj Application layer
35.110 Omreževanje Networking
SIST EN IEC 61158-6-4:2019 en,fr,de

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

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SIST EN IEC 61158-6-4:2019
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SIST EN IEC 61158-6-4:2019
EUROPEAN STANDARD EN IEC 61158-6-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-6-4:2014 and all of its
amendments and corrigenda (if any)
English Version
Industrial communication networks - Fieldbus specifications -
Part 6-4: Application layer protocol specification - Type 4
elements
(IEC 61158-6-4:2019)

Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 6-4:

bus de terrain - Partie 6-4: Spécification du protocole de la Protokollspezifikation des Application Layer

couche application - Eléments de type 4 (Anwendungsschicht) - Typ 4-Elemente
(IEC 61158-6-4:2019) (IEC 61158-6-4:2019)

This European Standard was approved by CENELEC on 2019-07-25. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61158-6-4:2019 E
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SIST EN IEC 61158-6-4:2019
EN IEC 61158-6-4:2019 (E)
European foreword

The text of document 65C/948/FDIS, future edition 3 of IEC 61158-6-4, prepared by SC 65C

"Industrial networks" 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 61158-6-4:2019.

The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-04-25

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-07-25

document have to be withdrawn

This document supersedes EN 61158-6-4:2014 and all of its amendments and corrigenda (if any).

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 61158-6-4:2019 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 61158-1:2019 NOTE Harmonized as EN IEC 61158-1:2019 (not modified)
IEC 61158-2 NOTE Harmonized as EN 61158-2
IEC 61158-4-4:2019 NOTE Harmonized as EN IEC 61158-4-4:2019 (not modified)
IEC 61784-1:2019 NOTE Harmonized as EN IEC 61784-1:2019 (not modified)
IEC 61784-2:2019 NOTE Harmonized as EN IEC 61784-2:2019 (not modified)
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SIST EN IEC 61158-6-4:2019
EN IEC 61158-6-4:2019 (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 61158-3-4 2019 Industrial communication networks - EN IEC 61158-3-4 2019
Fieldbus specifications - Part 3-4: Data-link
layer service definition - Type 4 elements
IEC 61158-5-4 2019 Industrial communication networks - EN IEC 61158-5-4 2019
Fieldbus specifications - Part 5-4:
Application layer service definition - Type 4
elements
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic reference model:
The basic model
ISO/IEC 8822 - Information technology - Open Systems - -
Interconnection - Presentation service
definition
ISO/IEC 8824-1 - Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of
basic notation
ISO/IEC 9545 - Information technology - Open Systems - -
Interconnection - Application layer
structure
ISO/IEC 9797-1 - Information technology - Security - -
techniques - Message Authentication
Codes (MACs) – Part 1: Mechanisms using
a block cipher
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
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SIST EN IEC 61158-6-4:2019
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SIST EN IEC 61158-6-4:2019
IEC 61158-6-4
Edition 3.0 2019-06
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-4: Application layer protocol specification – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-7009-7

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

® Registered trademark of the International Electrotechnical Commission
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SIST EN IEC 61158-6-4:2019
– 2 – IEC 61158-6-4:2019 © IEC 2019
CONTENTS

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

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

1 Scope .............................................................................................................................. 8

1.1 General ................................................................................................................... 8

1.2 Specifications ......................................................................................................... 8

1.3 Conformance .......................................................................................................... 9

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

3 Terms, definitions, symbols, abbreviations and conventions ............................................ 9

3.1 Referenced terms and definitions .......................................................................... 10

3.1.1 ISO/IEC 7498-1 terms .................................................................................... 10

3.1.2 ISO/IEC 8822 terms ....................................................................................... 10

3.1.3 ISO/IEC 9545 terms ....................................................................................... 10

3.1.4 ISO/IEC 8824-1 terms .................................................................................... 10

3.1.5 Fieldbus data-link layer terms ........................................................................ 10

3.2 Abbreviations and symbols ................................................................................... 11

3.3 Conventions .......................................................................................................... 11

3.3.1 General concept ............................................................................................ 11

3.3.2 Conventions for state machines for Type 4 .................................................... 12

4 FAL syntax description .................................................................................................. 13

4.1 FAL-AR PDU abstract syntax ................................................................................ 13

4.1.1 General ......................................................................................................... 13

4.1.2 Abstract syntax of APDU header .................................................................... 13

4.1.3 Abstract syntax of APDU body ....................................................................... 14

4.2 Data types ............................................................................................................ 16

5 Transfer syntaxes .......................................................................................................... 16

5.1 APDU encoding .................................................................................................... 16

5.1.1 APDU Header encoding ................................................................................. 16

5.1.2 APDU body encoding ..................................................................................... 18

5.2 Variable object encoding and packing ................................................................... 20

5.2.1 Encoding of simple variables ......................................................................... 20

5.2.2 Encoding of constructed variables ................................................................. 21

5.2.3 Alignment ...................................................................................................... 22

5.2.4 Variable object attributes ............................................................................... 23

5.3 Error codes ........................................................................................................... 24

6 FAL protocol state machines ......................................................................................... 25

7 AP-context state machine .............................................................................................. 26

8 FAL service protocol machine (FSPM) ........................................................................... 27

8.1 Primitives exchanged between FAL User and FSPM ............................................. 27

8.2 FSPM states ......................................................................................................... 27

8.2.1 General ......................................................................................................... 27

8.2.2 FSPM proxy object states .............................................................................. 27

8.2.3 FSPM real object state machine description .................................................. 32

9 Application relationship protocol machine (ARPM) ......................................................... 34

9.1 Primitives exchanged between ARPM and FSPM .................................................. 34

9.2 ARPM States ........................................................................................................ 34

9.2.1 General ......................................................................................................... 34

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IEC 61158-6-4:2019 © IEC 2019 – 3 –

9.2.2 Sender state transitions ................................................................................. 34

9.2.3 Receiver state transitions .............................................................................. 35

10 DLL mapping protocol machine (DMPM) ........................................................................ 36

10.1 Data-link Layer service selection........................................................................... 36

10.1.1 General ......................................................................................................... 36

10.1.2 DL-UNITDATA request .................................................................................. 36

10.1.3 DL-UNITDATA indication ............................................................................... 36

10.1.4 DL-UNITDATA response ................................................................................ 36

10.1.5 DLM-Set primitive and parameters ................................................................. 36

10.1.6 DLM-Get primitive and parameters ................................................................ 36

10.2 Primitives exchanged between ARPM and DLPM .................................................. 36

10.3 Primitives exchanged between DLPM and data-link layer ...................................... 37

10.4 DLPM states ......................................................................................................... 37

10.4.1 States ............................................................................................................ 37

10.4.2 Sender state transitions ................................................................................. 38

10.4.3 Receiver state transitions .............................................................................. 39

11 Protocol options............................................................................................................. 39

Bibliography .......................................................................................................................... 40

Figure 1 – State transition diagram ....................................................................................... 12

Figure 2 – APDU header structure ........................................................................................ 16

Figure 3 –Subfields of ControlStatus for Request .................................................................. 17

Figure 4 – Subfields of ControlStatus for Response with error .............................................. 17

Figure 5 – Subfields of ControlStatus for Response with no error .......................................... 18

Figure 6 – DataFieldFormat encoding ................................................................................... 18

Figure 7 – Structure of request APDU body .......................................................................... 19

Figure 8 – Structure of response APDU body ........................................................................ 19

Figure 9 – Variable identifier ................................................................................................. 19

Figure 10 – Code subfield of variable identifier ..................................................................... 19

Figure 11 – Sequence of data in the APDU body subfield ..................................................... 21

Figure 12 – MSG consists of APDU header and APDU body ................................................. 22

Figure 13 – Summary of FAL architecture ............................................................................. 26

Figure 14 – FSPM proxy object state machine ...................................................................... 28

Figure 15 – FSPM real object state machine ......................................................................... 33

Figure 16 – ARPM state machine .......................................................................................... 34

Figure 17 – DLPM state machine .......................................................................................... 37

Table 1 – State machine description elements ...................................................................... 12

Table 2 – APDU header ........................................................................................................ 13

Table 3 – APDU body ........................................................................................................... 15

Table 4 – Transfer syntax for Array ....................................................................................... 23

Table 5 – Transfer syntax for Structure ................................................................................. 23

Table 6 – Common variable object attributes ........................................................................ 23

Table 7 – Variable type identifiers ......................................................................................... 24

Table 8 – FIFO variable object attributes .............................................................................. 24

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SIST EN IEC 61158-6-4:2019
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Table 9 – Error codes ........................................................................................................... 25

Table 10 – Primitives exchanged between FAL-User and FSPM ........................................... 27

Table 11 – REQUEST.req FSPM constraints ......................................................................... 28

Table 12 – REQUEST.req FSPM actions .............................................................................. 29

Table 13 – RESPONSE.cnf FSPM constraints ...................................................................... 30

Table 14 – RESPONSE.cnf FSPM actions ............................................................................ 31

Table 15 – AR Send.ind proxy FSPM constraints .................................................................. 32

Table 16 – AR Send.ind proxy FSPM actions ........................................................................ 32

Table 17 – AR Send.ind real FSPM constraints ..................................................................... 33

Table 18 – AR Send.ind real FSPM Actions .......................................................................... 33

Table 19 – Primitives issued by FSPM to ARPM ................................................................... 34

Table 20 – Primitives issued by ARPM to FSPM ................................................................... 34

Table 21 – Primitives issued by ARPM to ARPM ................................................................... 34

Table 22 – AR Send.req ARPM constraints ........................................................................... 35

Table 23 – AR Send.req ARPM actions ................................................................................. 35

Table 24 – AR Acknowledge.req ARPM constraints .............................................................. 35

Table 25 – AR Acknowledge.req ARPM actions .................................................................... 35

Table 26 – AR Send.ind ARPM constraints ........................................................................... 36

Table 27 – AR Send.req ARPM actions ................................................................................. 36

Table 28 – Primitives issued by ARPM to DLPM ................................................................... 37

Table 29 – Primitives issued by DLPM to ARPM ................................................................... 37

Table 30 – Primitives issued by DLPM to data-link layer ....................................................... 37

Table 31 – Primitives issued by data-link layer to DLPM ....................................................... 37

Table 32 – AR Send.req DLPM constraints ........................................................................... 38

Table 33 – AR Send.req DLPM actions ................................................................................. 38

Table 34 – AR Acknowledge.req DLPM constraints ............................................................... 38

Table 35 – AR Acknowledge.req DLPM actions ..................................................................... 39

Table 36 – DL-UNITDATA.ind DLPM constraints ................................................................... 39

Table 37 – DL-UNITDATA.ind DLPM actions ......................................................................... 39

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SIST EN IEC 61158-6-4:2019
IEC 61158-6-4:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 6-4: Application layer protocol specification –
Type 4 elements
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

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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.

Attention is drawn to the fact that the use of the associated protocol type is restricted by its

intellectual-property-right holders. In all cases, the commitment to limited release of

intellectual-property-rights made by the holders of those rights permits a layer protocol type to

be used with other layer protocols of the same type, or in other type combinations explicitly

authorized by its intellectual-property-right holders.

NOTE Combinations of protocol types are specified in IEC 61784-1 and IEC 61784-2.

International Standard IEC 61158-6-4 has been prepared by subcommittee 65C: Industrial

networks, of IEC technical committee 65: Industrial-process measurement, control and

automation.

This third edition cancels and replaces the second edition published in 2014. This edition

constitutes a technical revision.
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SIST EN IEC 61158-6-4:2019
– 6 – IEC 61158-6-4:2019 © IEC 2019

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

edition:
a) additional user parameters to services;
b) additional services to support distributed objects;
c) additional secure services.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/948/FDIS 65C/956/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.

A list of all the parts of the IEC 61158 series, under the general title Industrial communication

networks – Fieldbus specifications, can be found on the IEC web site.

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.
A bilingual version of this publication may be issued at a later date.
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SIST EN IEC 61158-6-4:2019
IEC 61158-6-4:2019 © IEC 2019 – 7 –
INTRODUCTION

This document is one of a series produced to facilitate the interconnection of automation

system components. It is related to other standards in the set as defined by the “three-layer”

fieldbus reference model described in IEC 61158-1.

The application protocol provides the application service by making use of the services

available from the data-link or other immediately lower layer. The primary aim of this

document is to provide a set of rules for communication expressed in terms of the procedures

to be carried out by peer application entities (AEs) at the time of communication. These rules

for communication are intended to provide a sound basis for development in order to serve a

variety of purposes:
• as a guide for implementors and designers;
• for use in the testing and procurement of equipment;

• as part of an agreement for the admittance of systems into the open systems environment;

• as a refinement to the understanding of time-critical communications within OSI.

This document is concerned, in particular, with the communication and interworking of

sensors, effectors and other automation devices. By using this document together with other

standards positioned within the OSI or fieldbus reference models, otherwise incompatible

systems may work together in any combination.
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SIST EN IEC 61158-6-4:2019
– 8 – IEC 61158-6-4:2019 © IEC 2019
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 6-4: Application layer protocol specification –
Type 4 elements
1 Scope
1.1 General
The fieldbus application layer (FAL) provides user programs with a means
...

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