Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer service definition - Type 4 elements

IEC 61158-3-4:2019 defines the services provided to the Type 4 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model and systems management at the boundary between the data-link layer and systems management of the fieldbus reference model. This third edition cancels and replaces the second edition published in 2014. It constitutes a technical revision. The main changes are: -Additional user parameters to services; -Additional services to support distributed objects; -Additional secure services

Industrielle Kommunikationsnetze - Feldbusse - Teil 3-4: Dienstfestlegungen des Data-Link Layer (Sicherungsschicht) - Typ 4-Elemente

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-4: Définition des services de la couche liaison de données - Eléments de type 4

L’IEC 61158-3-4:2019 fournit les éléments communs des communications de messagerie critiques du point de vue temporel entre dispositifs dans un environnement automatisé. Le terme "en temps critique" signale l'existence d'une fenêtre temporelle dans laquelle des actions spécifiées doivent être exécutées, avec un niveau de certitude défini. La non-réalisation des actions spécifiées dans la fenêtre temporelle induit un risque de défaillance des applications qui demandent ces actions, avec les risques afférents pour l'équipement, les installations et éventuellement la vie humaine. La présente norme définit de manière abstraite les services visibles de l'extérieur fournis par la couche liaison de données de réseau de terrain de type 4 en termes a) des actions et événements primitifs des services; b) de paramètres associés à chaque événement et action de primitive, ainsi que de forme prise par ces paramètres; et c) d'interaction entre ces événements et ces actions, ainsi que de séquences valides desdits événements et actions.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-4. del: Definicija opravil na ravni podatkovnih povezav - Elementi tipa 4 (IEC 61158-3-4:2019)

Ta dokument določa skupne elemente za osnovne časovno kritične sporočilne komunikacije med napravami v avtomatizacijskem okolju. Izraz »časovno kritičen« se uporablja za predstavitev prisotnosti časovnega okna, v okviru katerega se zahteva dokončanje enega ali več opredeljenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja opredeljenih dejanj v časovnem oknu je možna odpoved aplikacij, ki zahtevajo dejanja, pri čemer so ogroženi oprema, obrat in morda človeška življenja. Ta mednarodni standard na abstrakten način določa zunanje vidna opravila, ki ga zagotavlja nivo podatkovnih povezav procesnih vodil tipa 4 v zvezi s/z: a) primitivnimi dejanji in dogodki opravil; b) parametri, povezanimi z vsakim primitivnim dejanjem in dogodkom, ter obliko, ki jo prevzamejo; in c) medsebojno povezavo med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji. Namen tega dokumenta je opredeliti opravila, ki se zagotavljajo za: – aplikacijski nivo procesnih vodil tipa 4 na meji med aplikacijskim nivojem in nivojem podatkovnih povezav referenčnega modela procesnih vodil; – vodenje sistemov na meji med nivojem podatkovnih povezav in vodenje sistemov referenčnega modela procesnih vodil.

General Information

Status
Published
Publication Date
20-Jun-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
21-Jun-2019
Completion Date
21-Jun-2019

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SLOVENSKI STANDARD
SIST EN IEC 61158-3-4:2019
01-november-2019
Nadomešča:
SIST EN 61158-3-4:2015

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-4. del:

Definicija opravil na ravni podatkovnih povezav - Elementi tipa 4 (IEC 61158-3-
4:2019)

Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer

service definition - Type 4 elements (IEC 61158-3-4:2019)

Industrielle Kommunikationsnetze - Feldbusse - Teil 3-4: Dienstfestlegungen des Data

Link Layer (Sicherungsschicht) - Typ 4-Elemente (IEC 61158-3-4:2019)

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-4:

Définition des services de la couche liaison de données - Eléments de type 4 (IEC 61158

-3-4:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-3-4:2019
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 61158-3-4:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61158-3-4:2019
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SIST EN IEC 61158-3-4:2019
EUROPEAN STANDARD EN IEC 61158-3-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 25.040.40; 35.100.20; 35.110 Supersedes EN 61158-3-4:2014
English Version
Industrial communication networks - Fieldbus specifications -
Part 3-4: Data-link layer service definition - Type 4 elements
(IEC 61158-3-4:2019)

Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 3-4:

bus de terrain - Partie 3-4: Définition des services de la Dienstfestlegungen des Data Link Layer

couche liaison de données - Eléments de type 4 (Sicherungsschicht) - Typ 4-Elemente

(IEC 61158-3-4:2019) (IEC 61158-3-4:2019)

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 61158-3-4:2019 E
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SIST EN IEC 61158-3-4:2019
EN IEC 61158-3-4:2019 (E)
European foreword

The text of document 65C/945/FDIS, future edition 3 of IEC 61158-3-4, 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 61158-3-4:2019.

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 61158-3-4:2014.

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 61158-3-4:2019 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 NOTE Harmonized as EN 61158-2
IEC 61158-4-4:2019 NOTE Harmonized as EN IEC 61158-4-4:2019 (not modified)
IEC 61158-5-4:2019 NOTE Harmonized as EN IEC 61158-5-4:2019 (not modified)
IEC 61784-1:2019 NOTE Harmonized as EN IEC 61784-1:2019 (not modified)
IEC 61784-2:2019 NOTE Harmonized as EN IEC 61784-2:2019 (not modified)
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SIST EN IEC 61158-3-4:2019
EN IEC 61158-3-4:2019 (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 1994 Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
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SIST EN IEC 61158-3-4:2019
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SIST EN IEC 61158-3-4:2019
IEC 61158-3-4
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-4: Data-link layer service definition – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6786-8

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 61158-3-4:2019
– 2 – IEC 61158-3-4:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

1.1 General ................................................................................................................... 7

1.2 Specifications ......................................................................................................... 7

1.3 Conformance .......................................................................................................... 7

2 Normative references ...................................................................................................... 8

3 Terms, definitions, symbols, abbreviations and conventions ............................................ 8

3.1 Reference model terms and definitions ................................................................... 8

3.2 Service convention terms and definitions ................................................................ 9

3.3 Data-link service terms and definitions .................................................................. 10

3.4 Symbols and abbreviations ................................................................................... 12

3.5 Conventions .......................................................................................................... 13

4 Data-link service and concepts ...................................................................................... 14

4.1 Overview............................................................................................................... 14

4.1.1 General ......................................................................................................... 14

4.1.2 Overview of DL-naming (addressing) ............................................................. 14

4.2 Types and classes of data-link service .................................................................. 15

4.3 Functional classes ................................................................................................ 15

4.4 Facilities of the connectionless-mode data-link service ......................................... 15

4.5 Model of the connectionless-mode data-link service .............................................. 15

4.5.1 General ......................................................................................................... 15

4.5.2 Unconfirmed request ..................................................................................... 15

4.5.3 Confirmed request ......................................................................................... 16

4.6 Sequence of primitives .......................................................................................... 16

4.6.1 Constraints on sequence of primitives ........................................................... 16

4.6.2 Relation of primitives at the end-points of connectionless service .................. 17

4.6.3 Sequence of primitives at one DLSAP............................................................ 18

4.7 Connectionless-mode data transfer functions ........................................................ 18

4.7.1 General ......................................................................................................... 18

4.7.2 Types of primitives and parameters ............................................................... 18

5 DL-management service ................................................................................................ 20

5.1 Scope and inheritance .......................................................................................... 20

5.2 Facilities of the DL-management service ............................................................... 20

5.3 Model of the DL-management service ................................................................... 21

5.4 Constraints on sequence of primitives ................................................................... 21

5.5 Set ........................................................................................................................ 21

5.5.1 Function ........................................................................................................ 21

5.5.2 Types of parameters ...................................................................................... 22

5.6 Get ....................................................................................................................... 22

5.6.1 Function ........................................................................................................ 22

5.6.2 Types of parameters ...................................................................................... 22

5.7 Action ................................................................................................................... 23

5.7.1 Function ........................................................................................................ 23

5.7.2 Types of parameters ...................................................................................... 23

5.7.3 Sequence of primitives .................................................................................. 24

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IEC 61158-3-4:2019 © IEC 2019 – 3 –

5.8 Event .................................................................................................................... 24

5.8.1 Function ........................................................................................................ 24

5.8.2 Types of parameters ...................................................................................... 24

Bibliography .......................................................................................................................... 25

Figure 1 – Relationship of PhE, DLE and DLS-users ............................................................. 14

Figure 2 – Confirmed and unconfirmed UNITDATA request time-sequence diagram ................ 17

Figure 3 – Repeated confirmed request time-sequence diagram ........................................... 17

Figure 4 – State transition diagram for sequences of primitives at one DLSAP ...................... 18

Figure 5 – Sequence of primitives for the DLM action service ............................................... 21

Table 1 – Summary of DL-connectionless-mode primitives and parameters .......................... 17

Table 2 – Unitdata transfer primitives and parameters .......................................................... 18

Table 3 – Control-status error codes ..................................................................................... 20

Table 4 – Summary of DL-management primitives and parameters ....................................... 21

Table 5 – DLM-Set primitive and parameters ........................................................................ 22

Table 6 – DLM-Get primitive and parameters ........................................................................ 22

Table 7 – DLM-Action primitive and parameters .................................................................... 23

Table 8 – DLM-Event primitive and parameters ..................................................................... 24

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SIST EN IEC 61158-3-4:2019
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-4: Data-link layer service definition –
Type 4 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 61158-3-4 has been prepared by subcommittee 65C: Industrial

networks, of IEC technical committee 65: Industrial-process measurement, control and

automation.

This third edition cancels and replaces the second edition published in 2014. This edition

constitutes a technical revision.
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SIST EN IEC 61158-3-4:2019
IEC 61158-3-4:2019 © IEC 2019 – 5 –

This edition includes the following significant technical changes with respect to the previous

edition:
a) additional user parameters to services;
b) additional services to support distributed objects;
c) additional secure services;
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 the parts of 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 61158-3-4:2019
– 6 – IEC 61158-3-4:2019 © IEC 2019
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.
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SIST EN IEC 61158-3-4:2019
IEC 61158-3-4:2019 © IEC 2019 – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-4: Data-link layer service definition –
Type 4 elements
1 Scope
1.1 General

This part of IEC 61158 provides common elements for basic time-critical messaging

communications between devices in an automation environment. The term “time-critical” is

used to represent the presence of a time-window, within which one or more specified actions

are required to be completed with some defined level of certainty. Failure to complete

specified actions within the time window risks 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 services provided

by the Type 4 fieldbus data-link layer in terms of
a) the primitive actions and events of the services;

b) the parameters associated with each primitive action and event, and the form which they

take; and

c) the interrelationship between these actions and events, and their valid sequences.

The purpose of this document is to define the services provided to

• the Type 4 fieldbus application layer at the boundary between the application and data-link

layers of the fieldbus reference model;
• systems management at the boundary between the data-link layer and systems
management of the fieldbus reference model.
1.2 Specifications

The principal objective of this document is to specify the characteristics of conceptual data-

link layer services suitable for time-critical communications, and thus 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 specification may be used as the basis for formal DL-Programming-Interfaces.

Nevertheless, it is not a formal programming interface, and any such interface will need to

address implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters;

b) the correlation of paired request and confirm, or indication and response, primitives.

1.3 Conformance

This document does not specify individual implementations or products, nor does it constrain

the implementations of data-link entities within industrial automation systems.

There is no conformance of equipment to this data-link layer service definition standard.

Instead, conformance is achieved through implementation of the corresponding data-link

protocol that fulfills the Type 1 data-link layer services defined in this document.

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– 8 – IEC 61158-3-4:2019 © IEC 2019
2 Normative references

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 All parts of the IEC 61158 series, as well as IEC 61784-1 and IEC 61784-2 are maintained simultaneously.

Cross-references to these documents within the text therefore refer to the editions as dated in this list of normative

references.

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 10731:1994, Information technology – Open Systems Interconnection – Basic

Reference Model – Conventions for the definition of OSI services
3 Terms, definitions, symbols, abbreviations and conventions

For the purposes of this document, the following terms, definitions, symbols, abbreviations

and conventions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Reference model terms and definitions
This document is based in part on the concepts developed in ISO/IEC 7498-1 and
ISO/IEC 7498-3, and makes use of the following terms defined therein.
3.1.1 DL-address [7498-3]
3.1.2 DL-address-mapping [7498-1]
3.1.3 called-DL-address [7498-3]
3.1.4 calling-DL-address [7498-3]
3.1.5 centralized multi-end-point-connection [7498-1]
3.1.6 DL-connection [7498-1]
3.1.7 DL-connection-end-point [7498-1]
3.1.8 DL-connection-end-point-identifier [7498-1]
3.1.9 DL-connection-mode transmission [7498-1]
3.1.10 DL-connectionless-mode transmission [7498-1]
3.1.11 correspondent (N)-entities [7498-1]
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1)
3.1.12 DL-duplex-transmission [7498-1]
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IEC 61158-3-4:2019 © IEC 2019 – 9 –
3.1.13 (N)-entity [7498-1]
DL-entity (N=2)
Ph-entity (N=1)
3.1.14 DL-facility
[7498-1]
3.1.15 flow control [7498-1]
3.1.16 (N)-layer [7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.17 layer-management [7498-1]
3.1.18 DL-local-view
[7498-3]
3.1.19 DL-name [7498-3]
3.1.20 naming-(addressing)-domain
[7498-3]
3.1.21 primitive name [7498-3]
3.1.22 DL-protocol
[7498-1]
3.1.23 DL-protocol-connection-identifier [7498-1]
3.1.24 DL-protocol-data-unit [7498-1]
3.1.25 DL-relay [7498-1]
3.1.26 Reset
[7498-1]
3.1.27 responding-DL-address [7498-3]
3.1.28 routing
[7498-1]
3.1.29 segmenting [7498-1]
3.1.30 (N)-service [7498-1]
DL-service (N=2)
Ph-service (N=1)
3.1.31 (N)-service-access-point [7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.32 DL-service-access-point-address
[7498-3]
3.1.33 DL-service-connection-identifier [7498-1]
3.1.34 DL-service-data-unit
[7498-1]
3.1.35 DL-simplex-transmission [7498-1]
3.1.36 DL-subsystem [7498-1]
3.1.37 systems-management [7498-1]
3.1.38 DLS-user-data
[7498-1]
3.2 Service convention terms and definitions

This document also makes use of the following terms defined in ISO/IEC 10731 as they apply

to the data-link layer:
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3.2.1 acceptor
3.2.2 confirm (primitive);
requestor.deliver (primitive)
3.2.3 deliver (primitive)
3.2.4 DL-confirmed-facility
3.2.5 DL-facility
3.2.6 DL-local-view
3.2.7 DL-mandatory-facility
3.2.8 DL-non-confirmed-facility
3.2.9 DL-service-primitive;
primitive
3.2.10 DL-service-provider
3.2.11 DL-service-user
3.2.12 DLS-user-optional-facility
3.2.13 indication (primitive);
acceptor.deliver (primitive)
3.2.14 request (primitive);
requestor.submit (primitive)
3.2.15 requestor
3.2.16 response (primitive);
acceptor.submit (primitive)
3.2.17 submit (primitive)
3.3 Data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.3.1
broadcast-node-address
address used to designate all DLEs on a link

Note 1 to entry: All DLEs on a link receive all DLPDUs where the first node-address is equal to the broadcast-

node-address. Such DLPDUs are always unconfirmed, and their receipt is never acknowledged. The value of the

broadcast-node-address is 126.
3.3.2
destination-DL-route
sequence of DL-route-elements, describing the complete route to the destination

Note 1 to entry: This includes both the destination DLSAP and a local component meaningful to the destination

DLS-user.
3.3.3
DL-route-element
octet holding a node DL-address or an address used by the DLS-user
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SIST EN IEC 61158-3-4:2019
IEC 61158-3-4:2019 © IEC 2019 – 11 –
3.3.4
DLSAP

distinctive point at which DL-services are provided by a single DL-entity to a single higher-

layer entity
3.3.5
DL(SAP)-address
individual DLSAP-address, designating a single DLSAP of a single DLS-user
3.3.6
DLS-user address
uniquely identifies a DLS-user locally
3.3.7
frame
denigrated synonym for DLPDU
3.3.8
full DL-route
combination of a destination-DL-route and a source-DL-route
3.3.9
local link
single DL-subnetwork in which any of the connected DLEs may communicate direc
...

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