SIST EN IEC 61158-4-25:2019

Industrial communication networks - Fieldbus specifications - Part 4-25: Data-link layer protocol specification - Type 25 elements (IEC 61158-4-25:2019)

This document provides basic time-critical messaging communications between devices in an automation environment. This protocol provides communication opportunities to all participating data- link entities a) in a synchronously-starting cyclic manner, according to a pre-established schedule, and b) in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities. Thus this protocol can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.

Industrielle Kommunikationsnetze - Feldbusse - Teil 4-25: Protokollspezifikation des Data Link Layer (Sicherungsschicht) - Typ 25-Elemente (IEC 61158-4-25:2019)

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-25: Spécification du protocole de la couche liaison de données - Éléments de type 25 (IEC 61158-4-25:2019)

IEC 61158-4-25:2019 La couche de liaison de données assure les communications de messagerie prioritaires de base entre les appareils d’un environnement d’automatisation.
Ce protocole offre des opportunités de communication à toutes les entités de liaison de données participantes
a) des opportunités de communication cyclique à démarrage synchrone, selon un ordre préétabli, et
b) de manière cyclique ou acyclique asynchrone, comme demandé par chaque cycle de chacune de ces entités de liaison de données.
Par conséquent, ce protocole peut se caractériser comme assurant un accès cyclique et acyclique asynchrone, mais avec un redémarrage synchrone de chaque cycle.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-25. del: Specifikacija protokola na ravni podatkovne povezave - Elementi tipa 25 (IEC 61158-4-25:2019)

Ta dokument določa osnovne časovno kritične sporočilne komunikacije med napravami v avtomatizacijskem okolju. Ta protokol omogoča komunikacijske priložnosti vsem sodelujočim entitetam podatkovnih povezav: a) na cikličen način s sinhronim začetkom v skladu z vnaprej določenim razporedom in b) na cikličen ali necikličen asinhroni način, kot posamezne entitete podatkovnih povezav zahtevajo v vsakem ciklu. Tako lahko ta protokol opredelimo kot protokol, ki asinhrono omogoča cikličen in acikličen dostop s sinhronim ponovnim zagonom vsakega cikla.

General Information

• Status: Published
• Publication Date: 07-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: 08-Oct-2019
• Ref Project: EN IEC 61158-4-25:2019 - Industrial communication networks - Fieldbus specifications - Part 4-25: Data-link layer protocol specification - Type 25 elements

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 61158-4-25:2019
01-november-2019
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 4-25. del:
Specifikacija protokola na ravni podatkovne povezave - Elementi tipa 25 (IEC
61158-4-25:2019)
Industrial communication networks - Fieldbus specifications - Part 4-25: Data-link layer
protocol specification - Type 25 elements (IEC 61158-4-25:2019)
Industrielle Kommunikationsnetze - Feldbusse - Teil 4-25: Protokollspezifikation des
Data Link Layer (Sicherungsschicht) - Typ 25-Elemente (IEC 61158-4-25:2019)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-25:
Spécification du protocole de la couche liaison de données - Éléments de type 25 (IEC
61158-4-25:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-4-25:2019
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 61158-4-25:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61158-4-25:2019


EUROPEAN STANDARD EN IEC 61158-4-25

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2019
ICS 25.040.40; 35.100.20; 35.110
English Version
Industrial communication networks - Fieldbus specifications -
Part 4-25: Data-link layer protocol specification - Type 25
elements
(IEC 61158-4-25:2019)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 4-25:
bus de terrain - Partie 4-25: Spécification du protocole de la Protokollspezifikation des Data Link Layer
couche liaison de données - Éléments de type 25 (Sicherungsschicht) - Typ 25-Elemente
(IEC 61158-4-25:2019) (IEC 61158-4-25:2019)
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 61158-4-25:2019 E

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SIST EN IEC 61158-4-25:2019
EN IEC 61158-4-25:2019 (E)
European foreword
The text of document 65C/946/FDIS, future edition 1 of IEC 61158-4-25, 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-
25:2019.
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

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 61158-4-25:2019 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61158-1:2019 NOTE Harmonized as EN IEC 61158-1:2019 (not modified)

2

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SIST EN IEC 61158-4-25:2019
EN IEC 61158-4-25:2019 (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 8802-2017 Standard for Ethernet - -
3
IEEE Std 802.1D -  IEEE Standard for Local and Metropolitan - -
Area Networks - Media access Control
(MAC) Bridges
IEEE Std 802.1Q -  IEEE Standard for Local and Metropolitan - -
Area Networks - Bridges and Bridged
Networks

3

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SIST EN IEC 61158-4-25:2019



IEC 61158-4-25

®


Edition 1.0 2019-04




INTERNATIONAL



STANDARD



















Industrial communication networks – Fieldbus specifications –

Part 4-25: Data-link layer protocol specification – Type 25 elements



























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6780-6




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


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 61158-4-25:2019
– 2 – IEC 61158-4-25:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 8
1.3 Procedures . 8
1.4 Applicability . 9
1.5 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 9
3.1 Reference model terms and definitions . 10
3.2 Service convention terms and definitions . 11
3.3 Terms and definitions. 11
3.4 Symbols and abbreviations . 13
3.5 Common conventions . 14
3.6 Additional Type 25 conventions . 16
3.6.1 Primitive conventions . 16
3.6.2 State machine conventions . 16
4 Overview of the DL-protocol . 17
4.1 General . 17
4.2 Overview of the medium access control . 17
4.2.1 General . 17
4.2.2 Network topology . 18
4.2.3 Priority control with VLAN . 19
4.2.4 The maximum delivery delay in Type 25 network . 20
4.2.5 Traffic control for real-time communication . 21
4.3 Service assumed from PhL . 21
4.4 DL Layer architecture. 22
4.5 Local parameters and variables . 23
4.5.1 Overview . 23
4.5.2 Variables, parameter, counter and timer . 23
5 General structure and encoding of PhPDUs and DLPDU and related elements of
procedure . 24
5.1 Overview . 24
5.2 Common MAC frame structure, encoding and elements of procedure . 24
5.2.1 MAC frame structure . 24
5.2.2 Elements of the MAC frame . 25
6 DLPDU-specific structure, encoding and elements of procedure . 27
6.1 General . 27
6.2 Structure of the RCL DLPDU . 27
6.2.1 RCL header . 27
7 DLE elements of procedure . 29
7.1 Overview . 29
7.2 RCL communication control (RCLC) . 29
7.2.1 General . 29
7.2.2 Primitive definitions . 29

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IEC 61158-4-25:2019 © IEC 2019 – 3 –
7.2.3 RCLC state machine . 32
7.2.4 Function of RCLC . 48
7.3 Real-time communication control (RTC) . 48
7.3.1 General . 48
7.3.2 Primitive definitions . 48
7.3.3 RTC state machine . 50
7.3.4 Function of RTC . 51
7.4 Transmit/Receive control (TRC) . 52
7.4.1 General . 52
7.4.2 Primitive definitions . 52
7.4.3 TRC state machine . 52
7.4.4 Function of TRC . 57
7.5 DLL management protocol (DLM) . 58
7.5.1 Overview . 58
7.5.2 Primitive definitions . 58
7.5.3 DLM state machine (DLM_SM) . 59
Bibliography . 61

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 16
Figure 2 – Ring control in Type 25 network . 18
Figure 3 – Communication ranges of Type 25 frames . 19
Figure 4 – Priority control with VLAN of Type 25 network . 20
Figure 5 – The mechanism of transmission delay in a node . 20
Figure 6 – The maximum delay in Type 25 network . 21
Figure 7 – Data-Link layer internal architecture . 22
Figure 8 – Type 25 fieldbus DLPDU frame format . 25
Figure 9 – RCL frame format. 26
Figure 10 – State transition diagram of RHE_SM-A . 33
Figure 11 – State transition diagram of RHE_SM-B . 36
Figure 12 – The state diagram of RCLNode_SM . 39
Figure 13 – The state diagram of RCLTR_SM . 46
Figure 14 – The state diagram of RTTR_SM . 51
Figure 15 – The state diagram of TRC_SM . 52
Figure 16 – The state diagram of DLM_SM . 59

Table 1 – State transition descriptions . 16
Table 2 – Descriptions of state machine elements . 17
Table 3 – Conventions used in state machine . 17
Table 4 – Characteristics of the node states . 18
Table 5 – Characteristic of the frame classes . 19
Table 6 – VLAN priority mapping of Type 25 network . 19
Table 7 – Data-link layer components . 22
Table 8 – Destination address format . 25
Table 9 – VLAN tag format . 26
Table 10 – Types and classes of RCL frames . 27

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Table 11 – Structure of RCL header . 28
Table 12 – Class field format . 28
Table 13 – Destination address field format . 28
Table 14 – Source address field format . 29
Table 15 – CMD field format . 29
Table 16 – The primitives and parameters for DLS-user interface . 30
Table 17 – Parameters used with primitives exchanged between RCLC and DLS-user . 30
Table 18 – The primitives and parameters for TRC interface . 31
Table 19 – Parameters used with primitives exchanged between RCLC and TRC . 31
Table 20 – The primitives and parameters for DLM interface . 32
Table 21 – Parameters used with primitives exchanged between RCLC and DLM . 32
Table 22 – Transitions of RHE_SM-A at RCL communication . 33
Table 23 – Transitions of RHE_SM-B at RCL communication . 36
Table 24 – Transitions of RCLNode_SM at RCL communication . 39
Table 25 – Transitions of RCLTR_SM at RCL communication . 47
Table 26 – RCLC function table . 48
Table 27 – The primitives and parameters for DLS-user interface . 49
Table 28 – Parameters used with primitives exchanged between RTC and DLS-user . 49
Table 29 – The primitives and parameters for TRC interface . 49
Table 30 – Parameters used with primitives exchanged between RTC and TRC . 50
Table 31 – The primitives and parameters for DLM interface . 50
Table 32 – Parameters used with primitives exchanged between RTC and DLM . 50
Table 33 – Transitions of RTTR_SM at RT communication . 51
Table 34 – RTC function table. 51
Table 35 – The primitives and parameters for DLM interface . 52
Table 36 – Parameters used with primitives exchanged between TRC and DLM . 52
Table 37 – Transitions of TRC_SM . 53
Table 38 – TRC function table. 57
Table 39 – Primitives exchanged between DLM and DLS-user . 58
Table 40 – Parameters used with primitives exchanged between DLM and DLS-user. 59
Table 41 – Transitions of DLM_SM . 60

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SIST EN IEC 61158-4-25:2019
IEC 61158-4-25:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 4-25: Data-link layer protocol specification –
Type 25 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,
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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
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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
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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.
International Standard IEC 61158-4-25 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/946/FDIS 65C/955/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 the ISO/IEC Directives, Part 2.

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SIST EN IEC 61158-4-25:2019
– 6 – IEC 61158-4-25:2019 © IEC 2019
A list of all parts in the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC website.
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.

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SIST EN IEC 61158-4-25:2019
IEC 61158-4-25:2019 © 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.
The data-link protocol provides the data-link service by making use of the services available
from the physical layer. The primary aim of this document is to provide a set of rules for
communication expressed in terms of the procedures to be carried out by peer data-link
entities (DLEs) at the time of communication. These rules for communication are intended to
provide a sound basis for development in order to serve a variety of purposes:
a) as a guide for implementers and designers;
b) for use in the testing and procurement of equipment;
c) as part of an agreement for the admittance of systems into the open systems environment;
d) as a refinement to the understanding of time-critical communications within OSI.
This document is concerned, in particular, with the communication and interworking of
sensors, effectors and other automation devices. By using this document together with other
standards positioned within the OSI or fieldbus reference models, otherwise incompatible
systems may work together in any combination.
NOTE Use of some of the associated protocol types is restricted by their 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 particular data-link layer protocol type to be used with physical layer and application layer protocols in Type
combinations as specified explicitly in the profile parts. Use of the various protocol types in other combinations
may require permission from their respective intellectual-property-right holders.
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning Type
25 elements and possibly other types given in this document as follows:
JP4074631 [HI] Transmission line system, frame transmitter therein, and transmission
line switching method
JP4653800 [HI] Transmission line system, frame transmission apparatus, method and
program for switching transmission line in transmission line system
JP4944986 [HI] Transmission line system and transmission line construction method
CN1964307 [HI] Transfer path system and frame transfer device in same system,
transfer path handover method and system
CN101515887 [HI] Transmission line system, frame transmitter therein, transmission line
switching method and program
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
either free of charge or under reasonable and non-discriminatory terms and conditions with
applicants throughout the world. In this respect, the statement of the holder of this patent
right is registered with IEC. Information may be obtained from:
[HI]   Hitachi, Ltd.
Intellectual Property Division
20-2, Saiwai-cho 1-chome, Hitachi-shi,
Ibaraki-ken, 317-0073 Japan
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsib
...