IEC 61158-4-3:2019

Industrial communication networks - Fieldbus specifications - Part 4-3: Data-link layer protocol specification - Type 3 elements

IEC 61158-4-3:2019 specifies procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider and the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units. This fourth edition cancels and replaces the third edition published in 2014 and constitutes a technical revision.
The main changes are:
This edition includes the following significant technical changes with respect to the previous edition:
•corrections in Table 3;
•corrections in Table A.15;
•spelling and grammar.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-3: Spécification du protocole de la couche liaison de données - Éléments de type 3

L'IEC 61158-4-3:2019 la couche liaison de données permet la communication de messages de base, critiques du point de vue temporel, entre appareils dans un environnement d'automatisation.
Ce protocole donne les moyens de communiquer à un sous-ensemble “maître” présélectionné d'entités de liaison de données de manière asynchrone cyclique, séquentiellement pour chacune de ces entités de liaison de données. D'autres entités de liaison de données communiquent uniquement si elles sont autorisées et déléguées par ces entités de liaison de données "maîtres".
Les communications d'un maître avec d'autres entités de liaison de données peuvent être cycliques ou acycliques avec accès selon un ordre de priorité, ou une combinaison des deux.
Ce protocole est un moyen de partager de manière équitable les ressources de communication disponibles. Il comporte des dispositions de fonctionnement synchrone et isochrone.

General Information

• Status: Published
• Publication Date: 17-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: 18-Apr-2019

Relations

• Revises: IEC 61158-4-3:2014 - Industrial communication networks - Fieldbus specifications - Part 4-3: Data-link layer protocol specificationn - Type 3 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61158-4-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-3: Data-link layer protocol specification – Type 3 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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IEC Central Office Tel.: [phone]
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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
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latest edition, a corrigendum or an amendment might have been published.

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IEC 61158-4-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –

Part 4-3: Data-link layer protocol specification – Type 3 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6773-8

– 2 – IEC 61158-4-3:2019 © IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
1.1 General . 10
1.2 Specifications . 10
1.3 Procedures . 10
1.4 Applicability . 10
1.5 Conformance . 11
2 Normative references . 11
3 Terms, definitions, symbols and abbreviations . 11
3.1 Reference model terms and definitions . 11
3.2 Service convention terms and definitions . 13
3.3 Common terms and definitions . 14
3.4 Additional Type 3 definitions . 16
3.5 Common symbols and abbreviations . 18
3.5.1 Data units . 18
3.5.2 Miscellaneous . 18
3.6 Type 3 symbols and abbreviations . 19
4 Common DL-protocol elements . 23
4.1 Frame check sequence . 23
4.1.1 General . 23
4.1.2 At the sending DLE . 24
4.1.3 At the receiving DLE . 25
5 Overview of the DL-protocol . 26
5.1 General . 26
5.2 Overview of the medium access control and transmission protocol . 26
5.3 Transmission modes and DL-entity . 27
5.3.1 Overview . 27
5.3.2 Token procedures . 28
5.3.3 Send or send/request mode . 32
5.4 Service assumed from the PhL . 32
5.4.1 Asynchronous transmission . 32
5.4.2 Synchronous transmission . 33
5.5 Operational elements . 36
5.5.1 Overview . 36
5.5.2 Bit time t . 36
BIT
5.5.3 Asynchronous transmission . 36
5.5.4 Synchronous transmission . 42
5.5.5 Timers and counters . 47
5.6 Cycle and system reaction times . 51
5.6.1 Asynchronous transmission . 51
5.6.2 Synchronous transmission . 53
6 General structure and encoding of DLPDUs, and related elements of procedure . 54
6.1 DLPDU granularity . 54
6.1.1 Asynchronous transmission – UART character . 54
6.1.2 Synchronous transmission . 55

6.2 Length octet (LE, LEr) . 55
6.3 Address octet . 56
6.3.1 Destination and source station address (DA and SA) . 56
6.3.2 Address extension (EXT) . 56
6.3.3 Address check . 57
6.3.4 DL-service-access-point (DLSAP) . 58
6.4 Control octet (FC) . 58
6.4.1 General . 58
6.4.2 Frame count bit . 60
6.5 DLPDU content error detection . 62
6.5.1 Asynchronous transmission – frame checksum (FCS) . 62
6.5.2 Synchronous transmission – frame check sequence (FCS) . 62
6.6 DATA_UNIT . 63
6.6.1 General . 63
6.6.2 Ident user data . 63
6.7 Error control procedures . 64
6.7.1 Asynchronous transmission . 64
6.7.2 Synchronous transmission . 64
7 DLPDU-specific structure, encoding and elements of procedure . 64
7.1 DLPDUs of fixed length with no data field . 64
7.1.1 Asynchronous transmission . 64
7.1.2 Synchronous transmission . 66
7.2 DLPDUs of fixed length with data field . 66
7.2.1 Asynchronous transmission . 66
7.2.2 Synchronous transmission . 67
7.3 DLPDUs with variable data field length . 68
7.3.1 Asynchronous transmission . 68
7.3.2 Synchronous transmission . 68
7.4 Token DLPDU . 69
7.4.1 Asynchronous transmission . 69
7.4.2 Synchronous transmission . 70
7.5 ASP DLPDU . 70
7.6 SYNCH DLPDU . 70
7.7 Time Event (TE) DLPDU . 70
7.8 Clock Value (CV) DLPDU . 70
7.9 Transmission procedures . 71
7.9.1 Asynchronous transmission . 71
7.9.2 Synchronous transmission . 72
8 Other DLE elements of procedure . 73
8.1 DL-entity initialization. 73
8.2 States of the media access control of the DL-entity . 74
8.2.1 General . 74
8.2.2 Offline . 75
8.2.3 Passive_Idle . 76
8.2.4 Listen_Token . 76
8.2.5 Active_Idle. 76
8.2.6 Claim_Token . 77
8.2.7 Wait_TCT . 77

– 4 – IEC 61158-4-3:2019 © IEC 2019
8.2.8 Use_Token . 78
8.2.9 Await_Data_Response . 78
8.2.10 Check_Access_Time .
...

IEC 61158-4-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 4-3: Data-link layer protocol specification – Type 3 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 4-3: Spécification du protocole de la couche liaison de données –
Éléments de type 3
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
your local IEC member National Committee for further information.

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les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

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3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 61158-4-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 4-3: Data-link layer protocol specification – Type 3 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 4-3: Spécification du protocole de la couche liaison de données –

Éléments de type 3
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-9137-5

– 2 – IEC 61158-4-3:2019 © IEC 2019
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
1.1 General . 10
1.2 Specifications . 10
1.3 Procedures . 10
1.4 Applicability . 10
1.5 Conformance . 11
2 Normative references . 11
3 Terms, definitions, symbols and abbreviations . 11
3.1 Reference model terms and definitions . 11
3.2 Service convention terms and definitions . 13
3.3 Common terms and definitions . 14
3.4 Additional Type 3 definitions . 16
3.5 Common symbols and abbreviations . 18
3.5.1 Data units . 18
3.5.2 Miscellaneous . 18
3.6 Type 3 symbols and abbreviations . 19
4 Common DL-protocol elements . 23
4.1 Frame check sequence . 23
4.1.1 General . 23
4.1.2 At the sending DLE . 24
4.1.3 At the receiving DLE . 25
5 Overview of the DL-protocol . 26
5.1 General . 26
5.2 Overview of the medium access control and transmission protocol . 27
5.3 Transmission modes and DL-entity . 28
5.3.1 Overview . 28
5.3.2 Token procedures . 28
5.3.3 Send or send/request mode . 32
5.4 Service assumed from the PhL . 32
5.4.1 Asynchronous transmission . 32
5.4.2 Synchronous transmission . 33
5.5 Operational elements . 36
5.5.1 Overview . 36
5.5.2 Bit time t . 36
BIT
5.5.3 Asynchronous transmission . 36
5.5.4 Synchronous transmission . 42
5.5.5 Timers and counters . 47
5.6 Cycle and system reaction times . 51
5.6.1 Asynchronous transmission . 51
5.6.2 Synchronous transmission . 53
6 General structure and encoding of DLPDUs, and related elements of procedure . 54
6.1 DLPDU granularity . 54
6.1.1 Asynchronous transmission – UART character . 54
6.1.2 Synchronous transmission . 55

6.2 Length octet (LE, LEr) . 55
6.3 Address octet . 56
6.3.1 Destination and source station address (DA and SA) . 56
6.3.2 Address extension (EXT) . 56
6.3.3 Address check . 57
6.3.4 DL-service-access-point (DLSAP) . 58
6.4 Control octet (FC) . 58
6.4.1 General . 58
6.4.2 Frame count bit . 60
6.5 DLPDU content error detection . 62
6.5.1 Asynchronous transmission – frame checksum (FCS) . 62
6.5.2 Synchronous transmission – frame check sequence (FCS) . 62
6.6 DATA_UNIT . 63
6.6.1 General . 63
6.6.2 Ident user data . 63
6.7 Error control procedures . 64
6.7.1 Asynchronous transmission . 64
6.7.2 Synchronous transmission . 64
7 DLPDU-specific structure, encoding and elements of procedure . 64
7.1 DLPDUs of fixed length with no data field . 64
7.1.1 Asynchronous transmission . 64
7.1.2 Synchronous transmission . 66
7.2 DLPDUs of fixed length with data field . 66
7.2.1 Asynchronous transmission . 66
7.2.2 Synchronous transmission . 67
7.3 DLPDUs with variable data field length . 68
7.3.1 Asynchronous tran
...