SIST EN 61158-5-12:2015
(Main)Industrial communication networks - Fieldbus specifications - Part 5-12: Application layer service definition - Type 12 elements (IEC 61158-5-12:2014)
Industrial communication networks - Fieldbus specifications - Part 5-12: Application layer service definition - Type 12 elements (IEC 61158-5-12:2014)
The fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a “window between corresponding application programs.”
This standard 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 12 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 standard defines in an abstract way the externally visible service provided by the different Types of the fieldbus Application Layer in terms of
a) an abstract model for defining application resources (objects) capable of being manipulated by users via the use of the FAL service,
b) the primitive actions and events of the service;
c) the parameters associated with each primitive action and event, and the form which they take; and
d) the interrelationship between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to
a) the FAL user at the boundary between the user and the Application Layer of the Fieldbus Reference Model, and
b) Systems Management at the boundary between the Application Layer and Systems Management of the Fieldbus Reference Model.
This standard specifies the structure and services of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545).
FAL services and protocols are provided by FAL application-entities (AE) contained within the application processes. The FAL AE is composed of a set of object-oriented Application Service Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. The ASEs provide communication services that operate on a set of related application process object (APO) classes. One of the FAL ASEs is a management ASE that provides a common set of services for the management of the instances of FAL classes.
Although these services specify, from the perspective of applications, how request and responses are issued and delivered, they do not include a specification of what the requesting and responding applications are to do with them. That is, the behavioral aspects of the applications are not specified; only a definition of what requests and responses they can send/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also defined in this standard to provide access to the FAL to control certain aspects of its operation.
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-12: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 12-Elemente (IEC 61158-5-12:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-12: Définition des services de la couche application - Éléments de type 12 (CEI 61158-5-12:2014)
L'IEC 61158-5-12:2014 défini les services mis en place pour l'utilisateur de FAL, à la frontière entre l'utilisateur et la couche application du modèle de référence de bus de terrain; et la Gestion des systèmes, à la frontière entre la couche application et la Gestion des systèmes selon le modèle de référence de bus de terrain. La présente norme spécifie la structure et les services de la couche application de bus de terrain IEC, en conformité avec le modèle de référence de base de l'OSI (ISO/CEI 7498-1) et la structure de la couche application de l'OSI (ISO/CEI 9545). Cette troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique. Cette édition inclut les modifications majeures suivantes:
- réparations des erreurs;
- améliorations éditoriales;
- prise en charge de l'Identification Explicite d'Appareils ajoutée dans l'ESM.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-12. del: Definicija opravil na aplikacijski ravni - Elementi tipa 12 (IEC 61158-5-12:2014)
Aplikacijski nivo procesnih vodil (FAL) omogoča uporabniškim programom dostop do komunikacijskega okolja procesnih vodil. In this respect, the FAL can be viewed as a “window between corresponding application programs.”
Ta standard določa skupne elemente za osnovne časovno kritične in časovno nekritične sporočilne komunikacije med aplikacijami v avtomatizacijskem okolju in material, specifičen za procesna vodila tipa 12. 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 standard na abstrakten način določa na zunaj vidno opravilo, ki ga zagotavlja aplikacijski nivo procesnih vodil različnih tipov v smislu
a) abstraktnega modela za določanje aplikacijskih virov (objektov), ki ga lahko upravljajo uporabniki prek opravila aplikacijskega nivoja procesnih vodil,
b) primitivnih dejanj in dogodkov opravila;
c) parametrov, povezanih z vsakim primitivnim dejanjem in dogodkom, ter obliko, ki jo prevzamejo; in
d) medsebojne povezave med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji.
Namen tega standarda je določiti opravila, ki se zagotavljajo za
a) uporabnika aplikacijskega nivoja procesnih vodil na meji med uporabnikom in referenčnim modelom aplikacijskega nivoja procesnega vodila, in
b) upravljanje sistemov na meji med aplikacijskim nivojem in upravljanjem sistemov za referenčni model procesnega vodila.
Ta standard določa strukturo in opravila aplikacijskega nivoja procesnih vodil IEC v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498) in strukturo aplikacijskega nivoja OSI (ISO/IEC 9545).
Opravila in protokole aplikacijskega nivoja procesnih vodil zagotavljajo aplikacijski osebki (AE) aplikacijskega nivoja procesnih vodil znotraj aplikacijskih procesov. Aplikacijski osebek aplikacijskega nivoja procesnih vodil sestavljata sklop objektno usmerjenih aplikacijskih opravilnih elementov (ASE) in osebek za upravljanje nivojev (LME), ki upravlja aplikacijski osebek. Aplikacijski opravilni elementi zagotavljajo komunikacijska opravila, ki delujejo na sklopu povezanih razredov objektov aplikacijskega procesa (APO). Med aplikacijske opravilne elemente aplikacijskega nivoja procesnih vodil spada aplikacijski opravilni element za upravljanje, ki zagotavlja skupen sklop opravil za upravljanje primerkov razredov aplikacijskega nivoja procesnih vodil.
Čeprav ta opravila določajo način izdajanja in dostavljanja zahtev in odzivov z vidika aplikacij, ne zajemajo specifikacije v zvezi s tem, kako naj se nanje odzovejo aplikacije, ki te zahteve in odzive oddajajo. To pomeni, da vedenjski vidiki aplikacij niso določeni; določena je le definicija zahtev in odzivov, ki jih lahko pošiljajo/prejemajo. Tako se uporabnikom aplikacijskega nivoja procesnih vodil omogoči večja prilagodljivost pri standardizaciji takega vedenja objektov. Poleg teh opravil so v tem standardu opredeljena tudi nekatera podporna opravila, da se omogoči dostop do aplikacijskega nivoja procesnih vodil za nadzorovanje nekaterih vidikov njegovega delovanja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61158-5-12:2015
01-marec-2015
1DGRPHãþD
SIST EN 61158-5-12:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-12. del:
Definicija opravil na aplikacijski ravni - Elementi tipa 12 (IEC 61158-5-12:2014)
Industrial communication networks - Fieldbus specifications - Part 5-12: Application layer
service definition - Type 12 elements (IEC 61158-5-12:2014)
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-12: Dienstfestlegungen des
Application Layer (Anwendungsschicht) - Typ 12-Elemente (IEC 61158-5-12:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-12:
Définition des services de la couche application - Éléments de type 12 (CEI 61158-5-
12:2014)
Ta slovenski standard je istoveten z: EN 61158-5-12:2014
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 61158-5-12:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-5-12:2015
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SIST EN 61158-5-12:2015
EUROPEAN STANDARD EN 61158-5-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-5-12:2012
English Version
Industrial communication networks - Fieldbus specifications -
Part 5-12: Application layer service definition - Type 12 elements
(IEC 61158-5-12:2014)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse -
bus de terrain - Partie 5-12: Définition des services de la Teil 5-12: Dienstfestlegungen des Application Layer
couche application - Éléments de type 12 (Anwendungsschicht) - Typ 12-Elemente
(CEI 61158-5-12:2014) (IEC 61158-5-12:2014)
This European Standard was approved by CENELEC on 2014-09-22. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61158-5-12:2014 E
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SIST EN 61158-5-12:2015
EN 61158-5-12:2014 - 2 -
Foreword
The text of document 65C/763/FDIS, future edition 3 of IEC 61158-5-12, 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 61158-5-12:2014.
The following dates are fixed:
• latest date by which the document has to be (dop) 2015-06-22
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-09-22
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61158-5-12:2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 61158-5-12:2014 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 61158-2 NOTE Harmonized as EN 61158-2.
IEC 61158-4-12 NOTE Harmonized as EN 61158-4-12.
IEC 61158-6-12 NOTE Harmonized as EN 61158-6-12.
IEC 61784-1 NOTE Harmonized as EN 61784-1.
IEC 61784-2 NOTE Harmonized as EN 61784-2.
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Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 61131-3 - Programmable controllers - EN 61131-3 -
Part 3: Programming languages
IEC 61158-1 2014 Industrial communication networks - EN 61158-1 2014
Fieldbus specifications -
Part 1: Overview and guidance for the
IEC 61158 and IEC 61784 series
IEC 61158-3-12 - Industrial communication networks - EN 61158-3-12 -
Fieldbus specifications -
Part 3-12: Data-link layer service definition
- Type 12 elements
ISO/IEC 646 1991 Information technology - ISO 7-bit coded - -
character set for information interchange
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic reference model:
The basic model
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic reference model:
Naming and addressing
ISO/IEC 8802-3 - Information technology - - -
Telecommunications and information
exchange between systems - Local and
metropolitan area networks - Specific
requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access
method and physical layer specifications
ISO/IEC 9545 - Information technology - Open Systems - -
Interconnection - Application layer
structure
ISO/IEC 10646 - Information technology - Universal Coded - -
Character Set (UCS)
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
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EN 61158-5-12:2014 - 4 -
Publication Year Title EN/HD Year
ISO/IEC/IEEE - Information technology - Microprocessor - -
60559 Systems - Floating-Point arithmetic
IEEE 802.1D - IEEE Standard for local and metropolitan - -
area networks - Media Access Control
(MAC) Bridges
IETF RFC 791 - Internet Protocol - DARPA Internet - -
Program Protocol Specification
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SIST EN 61158-5-12:2015
IEC 61158-5-12
®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Fieldbus specifications –
Part 5-12: Application layer service definition – Type 12 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-12: Définition des services de la couche application – Éléments
de type 12
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XF
CODE PRIX
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1737-5
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
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SIST EN 61158-5-12:2015
– 2 – IEC 61158-5-12:2014 © IEC 2014
CONTENTS
FOREWORD. 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 9
1.3 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 10
3.1 Reference model terms and definitions . 10
3.2 Service convention terms and definitions . 11
3.3 Application layer and data-link service terms and definitions . 11
3.4 Common symbols and abbreviations . 15
3.5 Conventions . 16
4 Concepts . 17
4.1 Common concepts . 17
4.2 Type specific concepts . 17
5 Data type ASE . 26
5.1 General . 26
5.2 Formal definition of data type objects . 26
5.3 FAL defined data types . 26
5.4 Data type ASE service specification . 35
6 Communication model specification . 35
6.1 ASEs . 35
6.2 AR . 116
Bibliography . 129
Figure 1 – Producer consumer model . 19
Figure 2 – Client server model . 19
Figure 3 – Server triggered invocation . 19
Figure 4 – Slave reference model . 21
Figure 5 – Simple slave device . 22
Figure 6 – Complex slave device . 23
Figure 7 – Master functional overview . 24
Figure 8 – Process output data sequence . 36
Figure 9 – Process input data sequence . 37
Figure 10 – CoE server model . 55
Figure 11 – Successful single SDO-Download sequence. 60
Figure 12 – Unsuccessful single SDO-Download sequence . 61
Figure 13 – Successful segmented SDO-Download sequence . 62
Figure 14 – Successful single SDO-Upload sequence . 63
Figure 15 – Unsuccessful single SDO-Upload sequence . 64
Figure 16 – Successful segmented SDO-Upload sequence . 65
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Figure 17 – SDO information sequence . 66
Figure 18 – Emergency service . 67
Figure 19 – Command sequence . 68
Figure 20 – PDO mapping . 70
Figure 21 – Sync manager PDO assigment . 71
Figure 22 – RxPDO service . 73
Figure 23 – TxPDO service . 74
Figure 24 – RxPDO remote transmission sequence . 75
Figure 25 – TxPDO remote transmission sequence . 76
Figure 26 – EoE sequence . 96
Figure 27 – FoE read sequence with success . 104
Figure 28 – FoE read sequence with error . 105
Figure 29 – FoE write sequence with success . 106
Figure 30 – FoE write sequence with error. 107
Figure 31 – FoE write sequence with busy . 108
Figure 32 – Successful AL control sequence . 118
Figure 33 – Unsuccessful AL control sequence . 119
Figure 34 – AL state changed sequence . 120
Table 1 – Process output data . 39
Table 2 – Process input data . 40
Table 3 – Update process input data . 41
Table 4 – SII read . 49
Table 5 – SII write . 50
Table 6 – SII reload . 51
Table 7 – Allocation of SDO areas. 55
Table 8 – SDO download expedited . 80
Table 9 – SDO download normal . 81
Table 10 – Download SDO segment . 82
Table 11 – SDO upload expedited . 83
Table 12 – SDO upload normal . 84
Table 13 – Upload SDO segment . 85
Table 14 – Abort SDO transfer . 85
Table 15 – Get OD list . 86
Table 16 – OD list segment . 87
Table 17 – Get object description . 88
Table 18 – Get entry description . 89
Table 19 – Object entry segment . 91
Table 20 – Emergency . 92
Table 21 – RxPDO . 93
Table 22 – TxPDO . 93
Table 23 – RxPDO remote transmission . 94
Table 24 – TxPDO remote transmission . 94
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Table 25 – Initiate EoE. 99
Table 26 – EoE fragment . 100
Table 27 – Set IP parameter . 101
Table 28 – Set address filter . 102
Table 29 – FoE read . 109
Table 30 – FoE write . 110
Table 31 – FoE data . 110
Table 32 – FoE ack . 111
Table 33 – FoE busy . 111
Table 34 – FoE error . 112
Table 35 – MBX read . 113
Table 36 – MBX write . 114
Table 37 – MBX read upd . 115
Table 38 – AL management and ESM service primitives . 117
Table 39 – AL control . 127
Table 40 – AL state change . 128
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SIST EN 61158-5-12:2015
IEC 61158-5-12:2014 © IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-12: Application layer service definition –
Type 12 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 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.
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 61158-5-12 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 2010. This edition
constitutes a technical revision. The main changes with respect to the previous edition are
listed below:
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SIST EN 61158-5-12:2015
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• bug fixes;
• editorial improvements;
• support of Explicit Device Identification added in ESM (see 6.2.2)
The text of this standard is based on the following documents:
FDIS Report on voting
65C/763/FDIS 65C/773/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 ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61158 series, published 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.
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SIST EN 61158-5-12:2015
IEC 61158-5-12:2014 © IEC 2014 – 7 –
INTRODUCTION
This part of IEC 61158 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 service is provided by the application protocol making use of the services
available from the data-link or other immediately lower layer. This standard defines the
application service characteristics that fieldbus applications and/or system management may
exploit.
Throughout the set of fieldbus standards, the term “service” refers to the abstract capability
provided by one layer of the OSI Basic Reference Model to the layer immediately above.
Thus, the application layer service defined in this standard is a conceptual architectural
service, independent of administrative and implementation divisions.
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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-12: Application layer service definition –
Type 12 elements
1 Scope
1.1 General
The fieldbus Application Layer (FAL) provides user programs with a means to access the
fieldbus communication environment. In this respect, the FAL can be viewed as a “window
between corresponding application programs.”
This standard 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 12 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 standard defines in an abstract way the externally visible service provided by the
different Types of the fieldbus Application Layer in terms of
a) an abstract model for defining application resources (objects) capable of being
manipulated by users via the use of the FAL service,
b) the primitive actions and events of the service;
c) the parameters associated with each primitive action and event, and the form which they
take; and
d) the interrelationship between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to
a) the FAL user at the boundary between the user and the Applic
...
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