IEC 61158-5-25:2019
(Main)Industrial communication networks - Fieldbus specifications - Part 5-25: Application layer service definition - Type 25 elements
Industrial communication networks - Fieldbus specifications - Part 5-25: Application layer service definition - Type 25 elements
IEC 61158-5-25:2019 specifies the structure and services of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI ApplicationLayer 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
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-25: Définition des services de la couche application - Eléments de type 25
L'IEC 61158-5-25:2019 définit de manière abstraite le service visible de l'extérieur fourni par les différents types de la couche application de bus de terrain en termes
a) de modèle abstrait visant à la définition des ressources d'application (objets) qui peuvent être manipulées par des utilisateurs utilisant un service FAL;
b) d'événements et d'actions liées aux primitives du service;
c) de paramètres associés à chaque événement et action de primitive, ainsi que de forme prise par ces paramètres; et
d) d'interaction entre ces événements et ces actions, ainsi que de séquences valides desdits événements et actions.
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IEC 61158-5-25
®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-25: Application layer service definition – Type 25 elements
IEC 61158-5-25:2019-04(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 61158-5-25
®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-25: Application layer service definition – Type 25 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-6767-7
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61158-5-25:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 Overview . 8
1.2 Specification . 9
1.3 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 10
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 . 11
3.2 Additional Type 25 terms and definitions. 11
3.3 Symbols and abbreviations . 13
3.4 Conventions . 14
3.4.1 General conventions . 14
3.4.2 Conventions for class definitions . 14
3.4.3 Conventions for service definitions . 15
4 Concept . 16
5 Data type ASE . 17
5.1 Overview . 17
5.2 Fixed length types . 17
5.2.1 Numeric types . 17
5.3 String types . 19
5.3.1 OctetString . 19
6 Communication model specification . 19
6.1 Communication model . 19
6.1.1 General . 19
6.1.2 Cyclic communication model . 19
6.1.3 Acyclic communication model . 19
6.2 ASE type S . 20
6.2.1 Overview . 20
6.2.2 Cyclic data type S . 20
6.2.3 Acyclic data ASE type S . 25
6.3 ASE type N . 29
6.3.1 Overview type N . 29
6.3.2 Cyclic data ASE type N . 29
6.3.3 Acyclic data ASE type N . 33
6.4 AR type S . 46
6.4.1 Cyclic control type S . 47
6.4.2 Remote control . 51
6.4.3 RCL communication control . 53
6.4.4 RT communication control . 55
6.5 AR type N . 59
6.5.1 Cyclic transmission control . 59
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IEC 61158-5-25:2019 © IEC 2019 – 3 –
6.5.2 Acyclic transmission control. 63
6.5.3 RT communication control type N . 68
Bibliography . 71
Figure 1 – Cyclic communication model (n:n communication with shared memory) . 19
Figure 2 – Acyclic communication model (client server model) . 20
Figure 3 – Acyclic communication model (push model) . 20
Figure 4 – Structure of ASE type S of FAL Type 25 . 20
Figure 5 – Structure of ASE type N of FAL Type 25 . 29
Figure 6 – Structure of AR type S of FAL Type 25 . 46
Figure 7 – Structure of AR type N of FAL Type 25 . 59
Table 1 – Put_cyclicdata service parameters . 22
Table 2 – Get_cyclicdata service parameters . 23
Table 3 – Ctl_cyclic service parameters . 24
Table 4 – Send_ctldata service parameters . 26
Table 5 – Send_infodata service parameters . 27
Table 6 – Send_rmtctl service parameters . 28
Table 7 – Put_cyclicdata service parameters . 30
Table 8 – Get_cyclicdata service parameters . 31
Table 9 – Control_cyclic service parameters . 33
Table 10 – Put message service parameters . 35
Table 11 – Get message service parameters . 36
Table 12 – Put inquiry message service parameters . 39
Table 13 – Put ninquiry message service parameters . 40
Table 14 – Put reply message service parameters . 41
Table 15 – Send aliveinfo service parameters . 42
Table 16 – Receive aliveinfo service parameters . 43
Table 17 – Control_acyclic service parameters . 45
Table 18 – CYC_WRITE service parameters . 48
Table 19 – CYC_READ service parameters . 49
Table 20 – CTL_CYCLIC service parameters . 50
Table 21 – SendRMTCTL service parameters . 52
Table 22 – RCL_START service parameters . 54
Table 23 – RCL_STOP service parameters . 55
Table 24 – SendCTL service parameters . 56
Table 25 – SendINFO service parameters . 57
Table 26 – SendCTL_RMT service parameters . 58
Table 27 – SendCYC service parameters . 58
Table 28 – Write_cyclicdata service parameters . 60
Table 29 – Ctl_cyclic service parameters . 61
Table 30 – Transmit_acyclicdata1 service parameters . 64
Table 31 – Transmit_acyclicdata2 service parameters . 66
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Table 32 – Ctl_acyclic service parameters . 67
Table 33 – Send_cyclicdata service parameters . 69
Table 34 – Send_acyclicdata service parameters . 70
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IEC 61158-5-25:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-25: Application layer service definition –
Type 25 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
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61158-5-25 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/947/FDIS 65C/950/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 the ISO/IEC Directives, Part 2.
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– 6 – IEC 61158-5-25:2019 © IEC 2019
A list of all parts in the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC website.
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.
---------------------- Page: 8 ----------------------
IEC 61158-5-25:2019 © IEC 2019 – 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 document 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 document is a conceptual architectural
service, independent of administrative and implementation divisions.
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– 8 – IEC 61158-5-25:2019 © IEC 2019
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-25: Application layer service definition –
Type 25 elements
1 Scope
1.1 Overview
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 International 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 25 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 document 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 document 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 document specifies the structure and services of the IEC fieldbus Application Layer, in
conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) 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
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IEC 61158-5-25:2019 © IEC 2019 – 9 –
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 document to provide access to the FAL to control certain aspects of
its operation.
1.2 Specification
The principal objective of this document is to specify the characteristics of conceptual
application layer services suitable for time-critical communications, and thus supplement the
OSI Basic Reference Model in guiding the development of application layer protocols for
time-critical communications.
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
services standardized as the various Types of IEC 61158, and the corresponding protocols
standardized in subparts of IEC 61158-6.
This specification may be used as the basis for formal Application Programming-Interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to
address implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters, and
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This document does not specify individual implementations or products, nor does it constrain
the implementations of application layer entities within industrial automation systems.
There is no conformance of equipment to this application layer service definition standard.
Instead, conformance is achieved through implementation of conforming application layer
protocols that fulfill any given Type of application layer services as defined in this document.
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 61158-3-25:2019, Industrial communication networks – Fieldbus specifications –
Part 3-25: Data-link layer service definition – Type 25 elements
IEC 61158-6-25:2019, Industrial communication networks – Fieldbus specifications –
Part 6-25: Application layer protocol specification – Type 25 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 9545, Information technology – Open Systems Interconnection – Application Layer
structure
---------------------- Page: 11 ----------------------
– 10 – IEC 61158-5-25:2019 © IEC 2019
ISO/IEC 8824-1, Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
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
3.1 Referenced terms and definitions
3.1.1 ISO/IEC 7498-1 terms
For the purposes of this document, the following terms given in ISO/IEC 7498-1 apply:
a) application entity;
b) application process;
c) application protocol data unit;
d) application service element;
e) application entity invocation;
f) application process invocation;
g) application transaction;
h) real open system;
i) transfer syntax.
3.1.2 ISO/IEC 8822 terms
For the purposes of this document, the following terms given in ISO/IEC 8822 apply:
a) abstract syntax;
b) presentation context.
3.1.3 ISO/IEC 9545 terms
For the purposes of this document, the following terms given in ISO/IEC 9545 apply:
a) application-association;
b) application-context;
c) application context name;
d) application-entity-invocation;
e) application-entity-type;
f) application-process-invocation;
g) application-process-type;
h) application-service-element;
i) application control service element.
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IEC 61158-5-25:2019 © IEC 2019 – 11 –
3.1.4 ISO/IEC 8824-1 terms
For the purposes of this document, the following terms given in ISO/IEC 8824-1 apply:
a) object identifier;
b) type.
3.2 Additional Type 25 terms and definitions
3.2.1
ADP message
message conveyed by an autonomous decentralized system protocol
3.2.2
alive-message
message reporting own node state, periodically transmitted
3.2.3
block
basic unit of data transferred in a cyclic communication, each having a size of 64 bytes
3.2.4
category N_f
category of an autonomous decentralized system protocol in type N with a full specification
3.2.5
category N_l
category of an autonomous decentralized system protocol in type N with a light weight
specifications
3.2.6
control communication
acyclic data communication for high time-critical applications in type S network
3.2.7
cyclic communication
periodic data communication for real-time communication
3.2.8
cyclic transfer memory
memory which is allocated to each node in the data field, which each node transmits
periodically for the purpose of logical sharing of this memory area
3.2.9
data field
logical place through which specific data passes, corresponding to real networks
3.2.10
domain
administrative set consisting of multiple data fields
3.2.11
duplex LAN
two different network-paths between end nodes
3.2.12
equipment
physical hardware connected to the network
---------------------- Page: 13 ----------------------
– 12 – IEC 61158-5-25:2019 © IEC 2019
EXAMPLE Station, device, and server.
3.2.13
information communication
acyclic data communication for low time-critical application in type S network
3.2.14
logical node, node
equipment in data fields where an autonomous decentralized system's function is installed
3.2.15
message
...
IEC 61158-5-25
®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 5-25: Application layer service definition – Type 25 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-25: Définition des services de la couche application – Eléments
de type 25
IEC 61158-5-25:2019-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61158-5-25
®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 5-25: Application layer service definition – Type 25 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-25: Définition des services de la couche application – Eléments
de type 25
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-9143-6
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 61158-5-25:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 Overview . 8
1.2 Specification . 9
1.3 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 10
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 . 11
3.2 Additional Type 25 terms and definitions. 11
3.3 Symbols and abbreviations . 13
3.4 Conventions . 14
3.4.1 General conventions . 14
3.4.2 Conventions for class definitions . 14
3.4.3 Conventions for service definitions . 15
4 Concept . 16
5 Data type ASE . 17
5.1 Overview . 17
5.2 Fixed length types . 17
5.2.1 Numeric types . 17
5.3 String types . 19
5.3.1 OctetString . 19
6 Communication model specification . 19
6.1 Communication model . 19
6.1.1 General . 19
6.1.2 Cyclic communication model . 19
6.1.3 Acyclic communication model . 19
6.2 ASE type S . 20
6.2.1 Overview . 20
6.2.2 Cyclic data type S . 20
6.2.3 Acyclic data ASE type S . 25
6.3 ASE type N . 29
6.3.1 Overview type N . 29
6.3.2 Cyclic data ASE type N . 29
6.3.3 Acyclic data ASE type N . 33
6.4 AR type S . 46
6.4.1 Cyclic control type S . 47
6.4.2 Remote control . 51
6.4.3 RCL communication control . 53
6.4.4 RT communication control . 55
6.5 AR type N . 59
6.5.1 Cyclic transmission control . 59
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IEC 61158-5-25:2019 © IEC 2019 – 3 –
6.5.2 Acyclic transmission control. 63
6.5.3 RT communication control type N . 68
Bibliography . 71
Figure 1 – Cyclic communication model (n:n communication with shared memory) . 19
Figure 2 – Acyclic communication model (client server model) . 20
Figure 3 – Acyclic communication model (push model) . 20
Figure 4 – Structure of ASE type S of FAL Type 25 . 20
Figure 5 – Structure of ASE type N of FAL Type 25 . 29
Figure 6 – Structure of AR type S of FAL Type 25 . 46
Figure 7 – Structure of AR type N of FAL Type 25 . 59
Table 1 – Put_cyclicdata service parameters . 22
Table 2 – Get_cyclicdata service parameters . 23
Table 3 – Ctl_cyclic service parameters . 24
Table 4 – Send_ctldata service parameters . 26
Table 5 – Send_infodata service parameters . 27
Table 6 – Send_rmtctl service parameters . 28
Table 7 – Put_cyclicdata service parameters . 30
Table 8 – Get_cyclicdata service parameters . 31
Table 9 – Control_cyclic service parameters . 33
Table 10 – Put message service parameters . 35
Table 11 – Get message service parameters . 36
Table 12 – Put inquiry message service parameters . 39
Table 13 – Put ninquiry message service parameters . 40
Table 14 – Put reply message service parameters . 41
Table 15 – Send aliveinfo service parameters . 42
Table 16 – Receive aliveinfo service parameters . 43
Table 17 – Control_acyclic service parameters . 45
Table 18 – CYC_WRITE service parameters . 48
Table 19 – CYC_READ service parameters . 49
Table 20 – CTL_CYCLIC service parameters . 50
Table 21 – SendRMTCTL service parameters . 52
Table 22 – RCL_START service parameters . 54
Table 23 – RCL_STOP service parameters . 55
Table 24 – SendCTL service parameters . 56
Table 25 – SendINFO service parameters . 57
Table 26 – SendCTL_RMT service parameters . 58
Table 27 – SendCYC service parameters . 58
Table 28 – Write_cyclicdata service parameters . 60
Table 29 – Ctl_cyclic service parameters . 61
Table 30 – Transmit_acyclicdata1 service parameters . 64
Table 31 – Transmit_acyclicdata2 service parameters . 66
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Table 32 – Ctl_acyclic service parameters . 67
Table 33 – Send_cyclicdata service parameters . 69
Table 34 – Send_acyclicdata service parameters . 70
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IEC 61158-5-25:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-25: Application layer service definition –
Type 25 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.
International Standard IEC 61158-5-25 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/947/FDIS 65C/950/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 the ISO/IEC Directives, Part 2.
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A list of all parts in the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC website.
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 61158-5-25:2019 © IEC 2019 – 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 document 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 document is a conceptual architectural
service, independent of administrative and implementation divisions.
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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-25: Application layer service definition –
Type 25 elements
1 Scope
1.1 Overview
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 International 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 25 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 document 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 document 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 document specifies the structure and services of the IEC fieldbus Application Layer, in
conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) 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
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IEC 61158-5-25:2019 © IEC 2019 – 9 –
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 document to provide access to the FAL to control certain aspects of
its operation.
1.2 Specification
The principal objective of this document is to specify the characteristics of conceptual
application layer services suitable for time-critical communications, and thus supplement the
OSI Basic Reference Model in guiding the development of application layer protocols for
time-critical communications.
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
services standardized as the various Types of IEC 61158, and the corresponding protocols
standardized in subparts of IEC 61158-6.
This specification may be used as the basis for formal Application Programming-Interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to
address implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters, and
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This document does not specify individual implementations or products, nor does it constrain
the implementations of application layer entities within industrial automation systems.
There is no conformance of equipment to this application layer service definition standard.
Instead, conformance is achieved through implementation of conforming application layer
protocols that fulfill any given Type of application layer services as defined in this document.
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 61158-3-25:2019, Industrial communication networks – Fieldbus specifications –
Part 3-25: Data-link layer service definition – Type 25 elements
IEC 61158-6-25:2019, Industrial communication networks – Fieldbus specifications –
Part 6-25: Application layer protocol specification – Type 25 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 9545, Information technology – Open Systems Interconnection – Application Layer
structure
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ISO/IEC 8824-1, Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
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
3.1 Referenced terms and definitions
3.1.1 ISO/IEC 7498-1 terms
For the purposes of this document, the following terms given in ISO/IEC 7498-1 apply:
a) ap
...
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