IEC 61158-6-4:2019
(Main)Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements
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.
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.
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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
IEC 61158-6-4:2019-06(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2019 IEC, Geneva, Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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
---------------------- Page: 3 ----------------------
– 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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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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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
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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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– 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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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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– 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 to access the
fieldbus communication environment. In this respect, the FAL can be viewed as a “window
between corresponding application programs.”
This part of IEC 61158 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 4 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 4 fieldbus application layer in terms of
a) the formal abstract syntax defining the application layer protocol data units conveyed
between communicating application entities;
b) the transfer syntax defining encoding rules that are applied to the application layer
protocol data units;
c) the application context state machine defining the application service behavior visible
between communicating application entities;
d) the application relationship state machines defining the communication behavior visible
between communicating application entities.
The purpose of this document is to define the protocol provided to
1) define the wire-representation of the service primitives defined in IEC 61158-5-4, and
2) define the externally visible behavior associated with their transfer.
This document specifies the protocol of the Type 4 fieldbus application layer, in conformance
with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure
(ISO/IEC 9545).
1.2 Specifications
The principal objective of this document is to specify the syntax and behavior of the
application layer protocol that conveys the application layer services defined in IEC 61158-5-4.
A secondary objective is to provide migration paths from previously-existing industrial
communications protocols. It is this latter objective which gives rise to the diversity of
protocols standardized in IEC 61158-6 series.
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IEC 61158-6-4:2019 © IEC 2019 – 9 –
1.3 Conformance
This document do not specify individual implementations or products, nor do they constrain
the implementations of application layer entities within industrial automation systems.
Conformance is achieved through implementation of this application layer protocol
specification.
2 Normative references
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 All parts of the IEC 61158 series, as well as IEC 61784-1 and IEC 61784-2 are maintained simultaneously.
Cross-references to these documents within the text therefore refer to the editions as dated in this list of normative
references.
IEC 61158-3-4:2019, Industrial communication networks – Fieldbus specifications – Part 3-4:
Data-link layer service definition – Type 4 elements
IEC 61158-5-4:2019, Industrial communication networks – Fieldbus specifications – Part 5-4:
Application layer service definition – Type 4 elements
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model – Part 1: 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 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
ISO/IEC 9797-1, Information technology – Security techniques – Message Authentication
Codes (MACs) – Part 1: Mechanisms using a block cipher
3 Terms, definitions, symbols, abbreviations and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviations
and conventions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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– 10 – IEC 61158-6-4:2019 © IEC
...
IEC 61158-6-4
®
Edition 3.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-4: Application layer protocol specification – Type 4 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-4: Spécification du protocole de la couche application – Eléments
de type 4
IEC 61158-6-4:2019-06(en-fr)
---------------------- Page: 1 ----------------------
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IEC 61158-6-4
®
Edition 3.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-4: Application layer protocol specification – Type 4 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-4: Spécification du protocole de la couche application – Eléments
de type 4
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-9702-5
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
---------------------- Page: 3 ----------------------
– 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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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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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
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 61158-6-4 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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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.
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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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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 to access the
fieldbus communication environment. In this respect, the FAL can be viewed as a “window
between corresponding application programs.”
This part of IEC 61158 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 4 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 4 fieldbus application layer in terms of
a) the formal abstract syntax defining the application layer protocol data units conveyed
between communicating application entities;
b) the transfer syntax defining encoding rules that are applied to the application layer
protocol data units;
c) the application context state machine defining the application service behavior visible
between communicating application entities;
d) the application relationship state machines defining the communication behavior visible
between communicating application entities.
The purpose of this document is to define the protocol provided to
1) define the wire-representation of the service primitives defined in IEC 61158-5-4, and
2) define the externally visible behavior associated with their transfer.
This document specifies the protocol of the Type 4 fieldbus application layer, in conformance
with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure
(ISO/IEC 9545).
1.2 Specifications
The principal objective of this document is to specify the syntax and behavior of the
application layer protocol that conveys the application layer services defined in
...
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