IEC 61158-3-21:2019

Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements

IEC 61158-3-21:2019 defines in an abstract way the externally visible service provided by the Type 21 fieldbus data-link layer in terms of the primitive actions and events of the service; the parameters associated with each primitive action and event, and the form which they take and the interrelationship between these actions and events, and their valid sequences. It cancels and replaces the first edition published in 2010 and constitutes a technical revision. The main changes are listed below:
•Added Network Control Message Type;
•Miscellaneous editorial corrections.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-21 : Définition des services de couche liaison de données - Éléments de type 21

L’IEC 61158-3-21:2019 fournit les éléments communs pour les communications de messagerie de base à temps critique entre des dispositifs dans un environnement d'automation. Le terme "à temps critique" dans ce contexte signifie la communication hiérarchisée par priorité et déterministe dans le temps sans collision en duplex intégral, dont l'une ou plusieurs actions spécifiées sont tenues d'être parachevées avec un certain niveau défini de certitude. Le manquement à parachever les actions spécifiées dans les limites du délai requis risque d'entraîner la défaillance des applications qui demandent ces actions, avec le risque concomitant pour l'équipement, la centrale et éventuellement pour la vie humaine.
La présente norme définit de manière abstraite le service visible de l'extérieur fourni par la couche liaison de données de type 21 en termes:
a) des actions et événements primitifs du service;
b) des paramètres associés à chaque action primitive et événement primitif, et la forme qu'ils prennent; et
c) des interrelations entre ces actions et événements, et leurs séquences valides.

General Information

• Status: Published
• Publication Date: 23-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: 24-Apr-2019

Relations

• Revises: IEC 61158-3-21:2010 - Industrial communication networks - Fieldbus specifications - Part 3-21: Data-link layer service definition - Type 21 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61158-3-21 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-21: Data-link layer service definition – Type 21 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
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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.

About IEC publications
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IEC 61158-3-21 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –

Part 3-21: Data-link layer service definition – Type 21 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6790-5

– 2 – IEC 61158-3-21:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 Overview. 8
1.2 Specifications . 8
1.3 Conformance . 8
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations, and conventions . 9
3.1 Reference model terms and definitions . 9
3.2 Service convention terms and definitions . 11
3.3 Common data-link service terms and definitions . 12
3.4 Additional Type 21 data-link specific definitions . 15
3.5 Common symbols and abbreviations . 15
3.6 Additional Type 21 symbols and abbreviations . 16
3.7 Common conventions . 16
3.8 Additional Type 21 conventions. 17
4 Data-link layer services and concepts . 17
4.1 General . 17
4.1.1 Overview . 17
4.1.2 Overview of full duplex flow control . 17
4.1.3 Types and classes of DL-layer service . 18
4.2 Detailed description of the data service . 21
4.2.1 General . 21
4.2.2 Sequence of primitives . 21
4.2.3 Transmit/receive data . 22
4.3 Detailed description of the sporadic data service . 23
4.3.1 General . 23
4.3.2 Sequence of Primitive . 24
4.3.3 Transmit/receive sporadic data . 24
4.4 Detailed description of network control message service . 25
4.4.1 General . 25
4.4.2 Sequence of Primitives . 25
4.4.3 Transmit/receive network control message . 25
5 Data-link management services . 28
5.1 General . 28
5.2 Data link management service (DLMS) facilities . 28
5.3 Data link management service (DLMS) . 28
5.3.1 Overview . 28
5.3.2 Reset . 29
5.3.3 Set-value . 29
5.3.4 Get-value . 29
5.3.5 SAP-allocation . 29
5.3.6 SAP-deallocation . 29
5.3.7 Get-SAP information . 29
5.3.8 Get-diagnostic-information . 29
5.3.9 Event . 29

5.3.10 Get-path . 29
5.4 Overview of interactions . 29
5.5 Detailed specification of service and interactions . 31
5.5.1 Reset . 31
5.5.2 Set-value . 31
5.5.3 Get-value . 32
5.5.4 SAP-allocation . 33
5.5.5 SAP-deallocation . 34
5.5.6 Get-SAP-information . 35
5.5.7 Get-diagnostic-information . 36
5.5.8 Event . 37
5.5.9 Get-path . 38
6 MAC control service . 39
6.1 General . 39
6.2 MAC control service . 39
6.2.1 Overview . 39
6.2.2 MAC-reset . 39
6.2.3 MAC-forward-control . 39
6.3 Overview of interactions . 39
6.4 Detailed specification of service and interactions . 40
6.4.1 MAC-reset . 40
6.4.2 MAC-forward-control . 41
7 Ph-control service . 42
7.1 General . 42
7.2 Ph-control service . 42
7.2.1 Overview . 42
7.2.2 Ph-reset . 42
7.2.3 Ph-get-link-status . 42
7.2.4 Ph-link-status-change . 42
7.3 Overview of interactions . 42
7.4 Detailed specification of service and interactions . 43
7.4.1 Ph-reset . 43
7.4.2 Ph-get-link-status . 44
7.4.3 Ph-link-status-change . 45
Bibliography . 46

Figure 1 – Full-duplex flow control . 18
Figure 2 – Sequence diagram of DL-DATA service . 18
Figure 3 – Sequence diagram of DL-SPDATA service . 19
Figure 4 – Sequence diagram of NCM service primitive . 19
Figure 5 – Relationships of DLSAPs, DLSAP-addresses, and group DL-addresses . 20
Figure 6 – DL-DATA service . 21
Figure 7 – Sequence diagram of Reset, Set-value, Get-value, SAP-allocation, SAP-
deallocation, Get-SAP information and Get-diagnostic information service primitives . 30
Figure 8 – Sequence diagram of Event service primitive . 31
Figure 9 – Sequence diagram of MAC-reset and MAC-forward-control service primitive . 40
Figure 10 – Sequence diagram of Ph-reset and Ph-get-link-status service primitive . 43

– 4 – IEC 61158-3-21:2019 © IEC 2019
Figure 11 – Sequence diagram of Ph-link-status-change service primitive . 43

Table 1 – Destination DL-address . 20
Table 2 – Primitives and parameters used in DL-DATA service . 22
Table 3 – DL-DATA Primitives and Paramete
...

IEC 61158-3-21 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-21: Data-link layer service definition – Type 21 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-21: Définition des services de couche liaison de données – Éléments
de type 21
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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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
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once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
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IEC 61158-3-21 ®
Edition 2.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 3-21: Data-link layer service definition – Type 21 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 3-21: Définition des services de couche liaison de données – Éléments

de type 21
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-9116-0

– 2 – IEC 61158-3-21:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 Overview. 8
1.2 Specifications . 8
1.3 Conformance . 8
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations, and conventions . 9
3.1 Reference model terms and definitions . 9
3.2 Service convention terms and definitions . 11
3.3 Common data-link service terms and definitions . 12
3.4 Additional Type 21 data-link specific definitions . 15
3.5 Common symbols and abbreviations . 15
3.6 Additional Type 21 symbols and abbreviations . 16
3.7 Common conventions . 16
3.8 Additional Type 21 conventions. 17
4 Data-link layer services and concepts . 17
4.1 General . 17
4.1.1 Overview . 17
4.1.2 Overview of full duplex flow control . 17
4.1.3 Types and classes of DL-layer service . 18
4.2 Detailed description of the data service . 21
4.2.1 General . 21
4.2.2 Sequence of primitives . 21
4.2.3 Transmit/receive data . 22
4.3 Detailed description of the sporadic data service . 23
4.3.1 General . 23
4.3.2 Sequence of Primitive . 24
4.3.3 Transmit/receive sporadic data . 24
4.4 Detailed description of network control message service . 25
4.4.1 General . 25
4.4.2 Sequence of Primitives . 25
4.4.3 Transmit/receive network control message . 25
5 Data-link management services . 28
5.1 General . 28
5.2 Data link management service (DLMS) facilities . 28
5.3 Data link management service (DLMS) . 28
5.3.1 Overview . 28
5.3.2 Reset . 29
5.3.3 Set-value . 29
5.3.4 Get-value . 29
5.3.5 SAP-allocation . 29
5.3.6 SAP-deallocation . 29
5.3.7 Get-SAP information . 29
5.3.8 Get-diagnostic-information . 29
5.3.9 Event . 29

5.3.10 Get-path . 29
5.4 Overview of interactions . 29
5.5 Detailed specification of service and interactions . 31
5.5.1 Reset . 31
5.5.2 Set-value . 31
5.5.3 Get-value . 32
5.5.4 SAP-allocation . 33
5.5.5 SAP-deallocation . 34
5.5.6 Get-SAP-information . 35
5.5.7 Get-diagnostic-information . 36
5.5.8 Event . 37
5.5.9 Get-path . 38
6 MAC control service . 39
6.1 General . 39
6.2 MAC control service . 39
6.2.1 Overview . 39
6.2.2 MAC-reset . 39
6.2.3 MAC-forward-control . 39
6.3 Overview of interactions . 39
6.4 Detailed specification of service and interactions . 40
6.4.1 MAC-reset . 40
6.4.2 MAC-forward-control . 41
7 Ph-control service . 42
7.1 General . 42
7.2 Ph-control service .
...