Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements

IEC 61158-4-21:2023 describes:
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;
procedures for giving communication opportunities based on ISO/IEC/IEEE 8802‑3 MAC, with provisions for nodes to be added or removed during normal operation;
structure of the fieldbus data link protocol data units (DLPDUs) used for the transfer of data and control information by the protocol of this document, and their representation as physical interface data units.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-21: Spécification du protocole de la couche liaison de données - Éléments de type 21

L'IEC 61158-4-21:2023 décrit:
des procédures de transfert en temps opportun de données et d’informations de commande d’une entité utilisateur de liaison de données à une entité utilisateur homologue ainsi qu’entre entités de liaison de données qui constituent le fournisseur de services distribués de la liaison;
des procédures offrant des moyens de communication fondées sur la commande d’accès au support (MAC) de l’ISO/IEC/IEEE 8802‑3, ainsi que des dispositions permettant d’ajouter et de retirer des nœuds au cours du fonctionnement normal;
la structure des unités de données de protocole de liaison de données (DLPDU) de bus de terrain utilisées pour le transfert des données et les informations de commande par le protocole objet du présent document, ainsi que leur représentation en tant qu’unités de données d’interface de couche physique.

General Information

Status
Published
Publication Date
27-Mar-2023
Technical Committee
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
31-Mar-2023
Completion Date
28-Mar-2023
Ref Project

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IEC 61158-4-21:2023 - Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements Released:3/28/2023
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IEC 61158-4-21 ®
Edition 3.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 4-21: Data-link layer protocol specification – Type 21 elements
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IEC 61158-4-21 ®
Edition 3.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –

Part 4-21: Data-link layer protocol specification – Type 21 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6555-0

– 2 – IEC 61158-4-21:2023 © IEC 2023
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 . 10
2 Normative references . 11
3 Terms, definitions, symbols and abbreviated terms . 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 21 definitions . 17
3.5 Common symbols and abbreviations . 17
3.6 Additional Type 21 symbols and abbreviations . 18
4 Overview of the data-link protocol . 18
4.1 General . 18
4.2 Overview of medium access control . 19
4.3 Service assumed from the physical layer . 19
4.4 DLL architecture . 20
4.4.1 General . 20
4.4.2 DLL management (DLM) interface support function . 21
4.5 Data type . 22
4.5.1 General . 22
4.5.2 Boolean . 22
4.5.3 Unsigned integer . 22
4.5.4 Signed integer . 22
4.5.5 Octet String . 23
4.5.6 Visible String . 23
4.5.7 Time of day . 23
4.6 Local parameters and variables . 24
4.6.1 General . 24
4.6.2 DLE configuration parameters . 24
4.6.3 Queues to support data transfer . 25
4.6.4 Variables to support SAP management . 25
4.6.5 Variables to support local device information management . 27
4.6.6 Variables and counter to support network information management . 31
4.6.7 Variables and counter to support a device path information
management . 35
4.6.8 Variables, counters, timers, and queues to support path table
management . 39
5 General structure and encoding . 39
5.1 Overview. 39
5.2 MAPDU structure and encoding . 39
5.3 Common MAC frame structure, encoding and elements of procedure . 40
5.3.1 MAC frame structure . 40

5.3.2 Elements of the MAC frame . 40
5.3.3 Elements of the Type 21 DLPDU . 41
5.4 Order of bit transmission . 49
5.5 Invalid DLPDU . 49
6 DLPDU structure and procedure . 49
6.1 General . 49
6.2 Common DLPDU Field . 49
6.2.1 General . 49
6.2.2 Version . 50
6.2.3 Length . 50
6.3 DL-DATA Transfer . 50
6.3.1 DT DLPDU . 50
6.4 DL-SPDATA Transfer . 53
6.4.1 SPDT DLPDU . 53
6.5 Network control messages . 55
6.5.1 General . 55
6.5.2 NCM_LA DLPDU . 55
6.5.3 NCM_AT DLPDU . 56
6.5.4 NCM_LS DLPDU . 58
6.5.5 NCM_RS DLPDU . 59
6.5.6 NCM_AR_DLPDU . 60
6.5.7 NCM_AR DLPDU structure . 60
7 DLE elements of procedure . 61
7.1 Overall structure . 61
7.2 DL-protocol machine (DLPM) . 61
7.2.1 Overview . 61
7.2.2 Primitive definitions . 61
7.2.3 DLPM state table . 65
7.2.4 DLPM functions . 68
7.3 DLL management Protocol . 70
7.3.1 Overview . 70
7.3.2 Primitive definitions . 70
7.3.3 DLM state table . 73
7.3.4 DLM functions . 97
8 Constants and error codes . 106
8.1 General . 106
8.2 Constants . 106
8.3 Data-link layer error codes . 108
Bibliography . 109

Figure 1 – Interaction of PhS primitives with DLE . 19
Figure 2 – Data-link layer architecture . 21
Figure 3 – Relationships of DLSAPs, DLSAP-addresses, and group DL-addresses . 26
Figure 4 – Common MAC frame format for Type 21 DLPDU . 40
Figure 5 – MAC frame format for other protocols . 40
Figure 6 – Version and Length field . 41
Figure 7 – DST_addr field . 42

– 4 – IEC 61158-4-21:2023 © IEC 2023
Figure 8 – SRC_addr field . 43
Figure 9 – Frame Control Field . 43
Figure 10 – Extension field .
...

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