IEC 61158-3-25:2019

Industrial communication networks - Fieldbus specifications - Part 3-25: Data-link layer service definition - Type X elements

IEC 61158-3-25:2019 defines the services provided to the Type 25 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model and systems management at the boundary between the data-link layer and systems management of the fieldbus reference model. It provides common elements for basic time-critical messaging communications between devices in an automation environment.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-25: Définition des services de la couche liaison de données - Éléments de type 25

L'IEC 61158-3-25:2019 fournit les éléments communs des communications de messagerie prioritaires de base entre dispositifs dans un environnement automatisé. On utilise le terme "prioritaire" pour traduire la présence d’une fenêtre temporelle, à l’intérieur de laquelle une ou plusieurs actions spécifiées doivent être terminées avec un niveau de certitude défini. Si les actions spécifiées ne sont pas réalisées dans la fenêtre temporelle, les applications demandant les actions risquent de connaître une défaillance, avec les risques que cela comporte pour les équipements, les installations et éventuellement la vie humaine.

General Information

• Status: Published
• Publication Date: 09-Apr-2019
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.20 - Data link layer
• ICS: 35.110 - Networking
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 26-Apr-2019
• Completion Date: 10-Apr-2019

Standards Content (Sample)

IEC 61158-3-25 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-25: Data-link layer service definition – Type 25 elements

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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latest edition, a corrigendum or an amendment might have been published.

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IEC 61158-3-25 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –

Part 3-25: Data-link layer service definition – Type 25 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6791-2

– 2 – IEC 61158-3-25:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 General . 7
1.2 Specifications . 7
1.3 Conformance . 7
2 Normative references . 8
3 Terms, definitions, symbols, abbreviations and conventions . 8
3.1 Reference model terms and definitions . 8
3.2 Service convention terms and definitions . 10
3.3 Terms and definitions . 10
3.4 Symbols and abbreviations . 12
3.5 Common conventions . 13
3.6 Additional Type 25 conventions. 15
4 DL services and concepts . 15
4.1 Overview. 15
4.2 Types of DLS . 15
4.2.1 General . 15
4.2.2 Primitive of the RCL communication and RT communication . 15
4.3 Detailed description of the RCL communication service . 16
4.3.1 Sequence of primitives . 16
4.3.2 Transmit / Receive DLSDU . 16
4.4 Detailed description of the RT communication service. 18
4.4.1 Sequence of primitives . 18
4.4.2 Transmit / Receive DLSDU . 18
5 DL management services . 19
5.1 General . 19
5.2 Facilities of the DLMS . 19
5.3 Service of the DL-management . 19
5.3.1 Overview . 19
5.3.2 RCL stop . 19
5.3.3 RCL start . 20
5.3.4 Node status . 20
5.4 Overview of interactions . 20
5.5 Detail specification of service and interactions . 20
5.5.1 RCL stop . 20
5.5.2 RCL start . 21
Bibliography . 23

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 14
Figure 2 – Sequence diagram of RCL communication and RT communication services . 16
Figure 3 – Sequence diagram of DL-management services . 20

Table 1 – Primitives and parameters used on the RCL communication service . 16
Table 2 – Transmit DLSDU primitives and parameters . 17

Table 3 – Primitives and parameters used on the RT communication service . 18
Table 4 – Transmit DLSDU primitives and parameters . 18
Table 5 – Transmit DLSDU primitives and parameters . 20
Table 6 – DLM_RCL_STOP primitives and parameters . 21
Table 7 – DLM_RCL_START primitives and parameters . 21
Table 8 – DLM_RCL_START primitives and parameters . 22

– 4 – IEC 61158-3-25:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-25: Data-link 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.
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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 61158-3-25 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/945/FDIS 65C/954/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.

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.

– 6 – IEC 61158-3-25:2019 © IEC 2019
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.
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 data-link layer service defined in this document is a conceptual architectural service,
independent of administrative and implementation divisions.

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-25: Data-link layer service definit
...

IEC 61158-3-25 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-25: Data-link layer service definition – Type 25 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-25: Définition des services de la couche liaison de données – Éléments
de type 25
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 61158-3-25 ®
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 3-25: Data-link layer service definition – Type 25 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 3-25: Définition des services de la couche liaison de données – Éléments

de type 25
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-9048-4

– 2 – IEC 61158-3-25:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 General . 7
1.2 Specifications . 7
1.3 Conformance . 7
2 Normative references . 8
3 Terms, definitions, symbols, abbreviations and conventions . 8
3.1 Reference model terms and definitions . 8
3.2 Service convention terms and definitions . 10
3.3 Terms and definitions . 10
3.4 Symbols and abbreviations . 12
3.5 Common conventions . 13
3.6 Additional Type 25 conventions. 15
4 DL services and concepts . 15
4.1 Overview. 15
4.2 Types of DLS . 15
4.2.1 General . 15
4.2.2 Primitive of the RCL communication and RT communication . 15
4.3 Detailed description of the RCL communication service . 16
4.3.1 Sequence of primitives . 16
4.3.2 Transmit / Receive DLSDU . 16
4.4 Detailed description of the RT communication service. 18
4.4.1 Sequence of primitives . 18
4.4.2 Transmit / Receive DLSDU . 18
5 DL management services . 19
5.1 General . 19
5.2 Facilities of the DLMS . 19
5.3 Service of the DL-management . 19
5.3.1 Overview . 19
5.3.2 RCL stop . 19
5.3.3 RCL start . 20
5.3.4 Node status . 20
5.4 Overview of interactions . 20
5.5 Detail specification of service and interactions . 20
5.5.1 RCL stop . 20
5.5.2 RCL start . 21
Bibliography . 23

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 14
Figure 2 – Sequence diagram of RCL communication and RT communication services . 16
Figure 3 – Sequence diagram of DL-management services . 20

Table 1 – Primitives and parameters used on the RCL communication service . 16
Table 2 – Transmit DLSDU primitives and parameters . 17

Table 3 – Primitives and parameters used on the RT communication service . 18
Table 4 – Transmit DLSDU primitives and parameters . 18
Table 5 – Transmit DLSDU primitives and parameters . 20
Table 6 – DLM_RCL_STOP primitives and parameters . 21
Table 7 – DLM_RCL_START primitives and parameters . 21
Table 8 – DLM_RCL_START primitives and parameters . 22

– 4 – IEC 61158-3-25:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-25: Data-link 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
...