SIST EN IEC 61158-3-21:2019

SLOVENSKI STANDARD
SIST EN IEC 61158-3-21:2019
01-november-2019
Nadomešča:
SIST EN 61158-3-21:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-21. del:
Definicija opravil na ravni podatkovnih povezav - Elementi tipa 21 (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)
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-21: Dienstfestlegungen des Data
Link Layer (Sicherungsschicht) - Typ 21-Elemente (IEC 61158-3-21:2019)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-21:
Définition des services de couche liaison de données - Eléments de Type 21 (IEC 61158-
3-21:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-3-21:2019
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 61158-3-21:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61158-3-21:2019

---------------------- Page: 2 ----------------------
SIST EN IEC 61158-3-21:2019


EUROPEAN STANDARD EN IEC 61158-3-21

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2019
ICS 25.040.40; 35.100.20; 35.110 Supersedes EN 61158-3-21:2012
English Version
Industrial communication networks - Fieldbus specifications -
Part 3-21: Data-link layer service definition - Type 21 elements
(IEC 61158-3-21:2019)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 3-21:
bus de terrain - Partie 3-21: Définition des services de Dienstfestlegungen des Data Link Layer
couche liaison de données - Eléments de Type 21 (Sicherungsschicht) - Typ 21-Elemente
(IEC 61158-3-21:2019) (IEC 61158-3-21:2019)
This European Standard was approved by CENELEC on 2019-05-29. 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 61158-3-21:2019 E

---------------------- Page: 3 ----------------------
SIST EN IEC 61158-3-21:2019
EN IEC 61158-3-21:2019 (E)
European foreword
The text of document 65C/945/FDIS, future edition 2 of IEC 61158-3-21, 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 61158-3-21:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-02-29
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-05-29
document have to be withdrawn
This document supersedes EN 61158-3-21:2012.
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 61158-3-21:2019 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 61158-5-21:2019 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

---------------------- Page: 4 ----------------------
SIST EN IEC 61158-3-21:2019
EN IEC 61158-3-21:2019 (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
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--  Standard for Ethernet - -
3


3

---------------------- Page: 5 ----------------------
SIST EN IEC 61158-3-21:2019

---------------------- Page: 6 ----------------------
SIST EN IEC 61158-3-21:2019



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




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


® Registered trademark of the International Electrotechnical Commission

---------------------- Page: 7 ----------------------
SIST EN IEC 61158-3-21:2019
– 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

---------------------- Page: 8 ----------------------
SIST EN IEC 61158-3-21:2019
IEC 61158-3-21:2019 © IEC 2019 – 3 –
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

---------------------- Page: 9 ----------------------
SIST EN IEC 61158-3-21:2019
– 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 Parameters . 22
Table 4 – Primitives and parameters used in DL-SPDATA service . 24
Table 5 – DL-SPDATA Primitives and Parameters . 24
Table 6 – Primitives and parameters used on DL-NCM_SND service . 25
Table 7 – DL-NCM_SND Primitives and Parameters . 26
Table 8 – Summary of Network Control Message Type . 27
Table 9 – Summary of DL-management primitives and parameters . 30
Table 10 – DLM-RESET primitives and parameters . 31
Table 11 – DLM-SET_VALUE primitives and parameters . 32
Table 12 – DLM-GET_VALUE primitives and parameters . 33
Table 13 – DLM-SAP_ALLOC primitives and parameters . 34
Table 14 – DLM-SAP_DEALLOC primitives and parameters . 35
Table 15 – DLM-GET_SAP_INFO primitives and parameters . 35
Table 16 – DLM-GET_DIAG primitives and parameters . 36
Table 17 – DLM-EVENT primitives and parameters . 37
Table 18 – DLM event identifier . 38
Table 19 – DLM-GET_PATH primitives and parameters . 38
Table 20 – Summary of MAC control primitives and parameters . 40
Table 21 – MAC-RESET primitives and parameters . 40
Table 22 – MAC-FW_CTRL primitives and parameters. 41
Table 23 – Summary of Ph-control primitives and parameters . 42
Table 24 – Ph-RESET primitives and parameters . 43
Table 25 – Ph-GET_LINK_STATUS primitives and parameters . 44
Table 26 – Ph-LINK_STATUS_CHANGE primitives and parameters. 45

---------------------- Page: 10 ----------------------
SIST EN IEC 61158-3-21:2019
IEC 61158-3-21:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-21: Data-link layer service definition –
Type 21 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 IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
Attention is drawn to the fact that the use of the associated protocol type is restricted by its
intellectual-property-right holders. In all cases, the commitment to limited release of
intellectual-property-rights made by the holders of those rights permits a layer protocol type to
be used with other layer protocols of the same type, or in other type combinations explicitly
authorized by its intellectual-property-right holders.
NOTE Combinations of protocol types are specified in IEC 61784-1 and IEC 61784-2.
International Standard IEC 61158-3-21 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2010. This edition
constitutes a technical revision.

---------------------- Page: 11 ----------------------
SIST EN IEC 61158-3-21:2019
– 6 – IEC 61158-3-21:2019 © IEC 2019
This edition includes the following significant technical changes with respect to the previous
edition:
• added Network Control Message Type;
• miscellaneous editorial corrections.
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 ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.
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.

---------------------- Page: 12 ----------------------
SIST EN IEC 61158-3-21:2019
IEC 61158-3-21:2019 © IEC 2019 – 7 –
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.

---------------------- Page: 13 ----------------------
SIST EN IEC 61158-3-21:2019
– 8 – IEC 61158-3-21:2019 © IEC 2019
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

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



1 Scope
1.1 Overview
This part of IEC 61158 provides the common elements for basic time-critical messaging
communications between devices in an automation environment. The term “time-critical” in
this context means the prioritized full-duplex collision-free time-deterministic communication,
of which one or more specified actions are required to be completed with some defined level
of certainty. Failure to complete specified actions within the required time risks the failure of
the applications requesting the actions, with attendant risk to equipment, plant, and possibly
human life.
This International Standard defines in an abstract way the externally visible service provided
by the Type 21 data-link layer in terms of:
a) the primitive actions and events of the service;
b) the parameters associated with each primitive action and event, and the form that they
take; and
c) the interrelationships between these actions and events, and their valid sequences.
The purpose of this document is to define the services provided to:
• The Type 21 application layer at the boundary between the application and DLLs of the
fieldbus reference model;
• Systems management at the boundary between the DLL and the systems management of
the fieldbus reference model.
1.2 Specifications
The principal objective of this document is to specify the characteristics of conceptual DLL
services suitable for time-critical communications, and to supplement the OSI Basic
Reference Model in guiding the development of data link protocols for time-critical
communications. A secondary objective is to provide migration paths from previously existing
industrial communications protocols.
This document may be used as the basis for formal data link programming interfaces.
Nevertheless, it is not a formal programm
...