SIST EN IEC 61158-4-21:2019

Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements (IEC 61158-4-21:2019)

This document provides basic time-critical data communications between devices in an automated environment. Type 21 provides priority-based cyclic and acyclic data communication using an internal collision-free, full-duplex dual-port Ethernet switch technology. For wide application in various automation applications, Type 21 does not restrict the cyclic/acyclic scheduling policy in the DLL.

Industrielle Kommunikationsnetze - Feldbusse - Teil 4-21: Protokollspezifikation des Data Link Layer (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-4-21:2019)

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-21: Spécification du protocole de la couche de liaison de données - Eléments de Type 21 (IEC 61158-4-21:2019)

L'IEC 61158-4-21:2019 décrit:
a) 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;
b) des procédures offrant des moyens de communication, fondées sur la commande d’accès au support (MAC) de l’ISO/IEC 8802 3, ainsi que des dispositions permettant d'ajouter et de retirer des nœuds au cours du fonctionnement normal;
c) 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'unité de données d'interface de couche physique.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-21. del: Specifikacija protokola na ravni podatkovnih povezav - Elementi tipa 21 (IEC 61158-4-21:2019)

Ta dokument omogoča osnovne časovno kritične podatkovne komunikacije med napravami v avtomatiziranem okolju. Tip 21 omogoča prioritetno ciklično in aciklično podatkovno komunikacijo z notranjo tehnologijo preklopa Ethernet brez kolizije, z dvojnimi vrati za popolno hkratnost. Za široko uporabo na različnih področjih avtomatizacije Tip 21 ne omejuje politike cikličnega/acikličnega razporejanja na nivoju podatkovnih povezav.

General Information

• Status: Published
• Publication Date: 10-Oct-2019
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.20 - Data link layer
• ICS: 35.110 - Networking
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-2019
• Due Date: 05-Sep-2019
• Completion Date: 11-Oct-2019
• Ref Project: EN IEC 61158-4-21:2019 - Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements

Relations

• Replaces: SIST EN 61158-4-21:2012 - Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements (IEC 61158-4-21:2010)
• Effective Date: 25-Jun-2019
• Replaces: SIST EN 61158-4-21:2012 - Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer protocol specification - Type 21 elements (IEC 61158-4-21:2010)
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61158-4-21:2019
01-november-2019
Nadomešča:
SIST EN 61158-4-21:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-21. del:
Specifikacija protokola na ravni podatkovnih povezav - Elementi tipa 21 (IEC 61158
-4-21:2019)
Industrial communication networks - Fieldbus specifications - Part 4-21: Data-link layer
protocol specification - Type 21 elements (IEC 61158-4-21:2019)
Industrielle Kommunikationsnetze - Feldbusse - Teil 4-21: Protokollspezifikation des
Data Link Layer (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-4-21:2019)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-21:
Spécification du protocole de la couche de liaison de données - Eléments de Type 21
(IEC 61158-4-21:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-4-21:2019
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.20 Podatkovni povezovalni sloj Data link layer
35.110 Omreževanje Networking
SIST EN IEC 61158-4-21:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61158-4-21:2019


EUROPEAN STANDARD EN IEC 61158-4-21

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2019
Supersedes EN 61158-4-21:2012
ICS 25.040.40; 35.100.20; 35.110
English Version
Industrial communication networks - Fieldbus specifications -
Part 4-21: Data-link layer protocol specification - Type 21
elements
(IEC 61158-4-21:2019)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 4-21:
bus de terrain - Partie 4-21: Spécification du protocole de la Protokollspezifikation des Data Link Layer
couche de liaison de données - Eléments de Type 21 (Sicherungsschicht) - Typ 21-Elemente
(IEC 61158-4-21:2019) (IEC 61158-4-21:2019)
This European Standard was approved by CENELEC on 2019-05-15. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61158-4-21:2019 E

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SIST EN IEC 61158-4-21:2019
EN IEC 61158-4-21:2019 (E)
European foreword
The text of document 65C/946/FDIS, future edition 2 of IEC 61158-4-21, prepared by SC 65C
"Industrial networks" of IEC/TC 65 "Industrial-process measurement, control and automation" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61158-4-
21:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-02-15
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-05-15
document have to be withdrawn

This document supersedes EN 61158-4-21:2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61158-4-21:2019 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61158-1:2019 NOTE Harmonized as EN IEC 61158-1:2019 (not modified)
IEC 61158-2:2014 NOTE Harmonized as EN 61158-2:2014 (not modified)
IEC 61158-5-21:2019 NOTE Harmonized as EN IEC 61158-5-21:2019 (not modified)
IEC 61784-2:2019 NOTE Harmonized as EN IEC 61784-2:2019 (not modified)
IEC 61918:2018 NOTE Harmonized as EN IEC 61918:2018 (not modified)

2

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SIST EN IEC 61158-4-21:2019
EN IEC 61158-4-21:2019 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 61158-3-21 2019 Industrial communication networks - EN IEC 61158-3-21 2019
Fieldbus specifications - Part 3-21: Data-
link layer service definition - Type 21
elements
ISO/IEC 7498-1 -  Information technology - Open Systems - -
Interconnection - Basic reference model:
The basic model
ISO/IEC 7498-3 -  Information technology - Open Systems - -
Interconnection - Basic reference model:
Naming and addressing
ISO/IEC 10731 -  Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
ISO/IEC/IEEE 8802-2017 Standard for Ethernet - -
3

3

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SIST EN IEC 61158-4-21:2019



IEC 61158-4-21

®


Edition 2.0 2019-04




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 978-2-8322-6777-6




  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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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 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 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 . 19
4.1 General . 19
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 . 23
4.5.5 Octet String . 23
4.5.6 Visible String . 23
4.5.7 Time of day . 24
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 . 26
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

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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 . 54
6.5.1 General . 54
6.5.2 NCM_LA DLPDU . 54
6.5.3 NCM_AT DLPDU . 56
6.5.4 NCM_LS DLPDU . 57
6.5.5 NCM_RS DLPDU . 58
6.5.6 NCM_AR_DLPDU . 59
6.5.7 NCM_AR DLPDU structure . 59
7 DLE elements of procedure . 60
7.1 Overall structure . 60
7.2 DL-protocol machine (DLPM) . 61
7.2.1 Overview . 61
7.2.2 Primitive definitions . 61
7.2.3 DLPM state table . 64
7.2.4 DLPM functions . 68
7.3 DLL management Protocol . 69
7.3.1 Overview . 69
7.3.2 Primitive definitions . 69
7.3.3 DLM state table . 72
7.3.4 DLM functions . 96
8 Constants and error codes . 105
8.1 General . 105
8.2 Constants . 106
8.3 Data-link layer error codes . 107
Bibliography . 108

Figure 1 – Interaction of PhS primitives with DLE . 20
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

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Figure 8 – SRC_addr field. 43
Figure 9 – Frame Control Field . 43
Figure 10 – Extension field . 46
Figure 11 – DSAP field . 47
Figure 12 – Source service access point field . 48
Figure 13 – Length of group mask and extension information . 48
Figure 14 – Group mask option field . 48
Figure 15 – Common DLPDU field . 50
Figure 16 – Building a DT DLPDU . 50
Figure 17 – DT DLPDU structure . 50
Figure 18 – SPDT DLPDU structure . 53
Figure 19 – NCM_LA DLPDU structure . 55
Figure 20 – DLL structure and elements . 60
Figure 21 – State transition diagram of the DLPM . 64
Figure 22 – State transition diagram of DLM . 73

Table 1 – DLL components . 20
Table 2 – UNSIGNEDn data type . 22
Table 3 – INTEGERn data type . 23
Table 4 – DLE configuration parameters . 25
Table 5 – Queues to support data transfer . 25
Table 6 – Variables to support SAP management . 26
Table 7 – Variables to support device information management . 27
Table 8 – DL–entity identifier . 28
Table 9 – Device Flags . 28
Table 10 – DLM state . 28
Table 11 – Device Unique Identification . 29
Table 12 – Unique identification of device connected to R-port1 . 29
Table 13 – Unique identification of device connected to R-port2 . 29
Table 14 – MAC address. 29
Table 15 – Port information . 30
Table 16 – Protocol version . 30
Table 17 – Device type . 31
Table 18 – Device description . 31
Table 19 – Hop count . 31
Table 20 – Variables to support managing network information . 32
Table 21 – Topology . 32
Table 22 – Collision count . 32
Table 23 – Device count . 33
Table 24 – Topology change count . 33
Table 25 – Last topology change time . 33
Table 26 – RNMP device UID . 33
Table 27 – RNMS device UID . 34

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Table 28 – LNM device UID for R-port1 . 34
Table 29 – LNM device UID for R-port2 . 34
Table 30 – Network flags . 35
Table 31 – Variables and counter to support managing path information . 36
Table 32 – Hop count for R-port1 direction . 36
Table 33 – Hop count for R-port2 direction . 37
Table 34 – Preferred R-port . 37
Table 35 – Destination R-port . 37
Table 36 – In net count . 38
Table 37 – In net time . 38
Table 38 – Out net count . 39
Table 39 – Out net time . 39
Table 40 – Version and Length . 42
Table 41 – Destination DL–entity identifier . 42
Table 42 – Source DL–entity identifier . 43
Table 43 – Frame control . 44
Table 44 – Extension . 47
Table 45 – Destination service access point . 47
Table 46 – source service access point. 48
Table 47 – DT DLPDU parameters . 51
Table 48 – Primitives exchanged between DLS-user and DLE to send a DT DLPDU . 52
Table 49 – Primitives exchanged between DLS-user and DLEs to receive a DT DLPDU . 53
Table 50 – SPDT DLPDU Parameters . 53
Table 51 – Primitive exchanged between DLS-User and DLEs to send an SPDT
DLPDU . 54
Table 52 – Primitives exchanged between DLS-user and DLEs to receive an SPDT
DLPDU . 54
Table 53 – NCM_LA DLPDU parameters . 55
Table 54 – NCM_AT DLPDU parameters . 56
Table 55 – NCM_LS DLPDU parameters . 57
Table 56 – NCM_RS DLPDU parameters . 58
Table 57 – NCM_AR DLPDU parameters . 59
Table 58 – Primitives exchanged between DLPM and DLS-user . 61
Table 59 – Parameters exchanged between DLPM and DLS-user . 62
Table 60 – Primitives exchanged between DLPM and DLM . 63
Table 61 – Parameters used with primitives exchanged between DLPM and DLM . 64
Table 62 – DLPM state table . 65
Table 63 – DLPM functions table . 68
Table 64 – Primitives exchanged between DLM and DLS-user . 70
Table 65 – Parameters used with primitives exchanged between DLM and DLS-user. 71
Table 66 – Primitive exchanged between DLM and DMAC . 71
Table 67 – Parameters used with primitives exchanged between DLM and DMAC . 72
Table 68 – Primitive exchanged between DLM and DPHY . 72
Table 69 – Parameters used with primitives exchanged between DLM and DPHY . 72

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Table 70 – DLM state table . 74
Table 71 – DLM function table . 96
Table 72 – DLL constants . 106
Table 73 – T
...