SIST EN 61158-3-18:2008

Industrial communication networks - Fieldbus specifications - Part 3-18: Data-link layer service definition - Type 18 elements

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 standard defines in an abstract way the externally visible service provided by the Type 17 fieldbus 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 which they take; and c) the interrelationship between these actions and events, and their valid sequences. The purpose of this standard is to define the services provided to the Type 17 fieldbus application layer at the boundary between the application and datalink 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; specifications The principal objective of this standard 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, and b) the correlation of paired request and confirm, or indication and response, primitives. Conformance This standard 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 17 data-link layer services defined in this standard.

Industrielle Kommunikationsnetze - Feldbusse - Teil 3-18: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 18-Elemente

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-18: Définition des services des couches de liaison de données - Eléments de type 18

La CEI 61158-3-18:2007 définit de manière abstraite les services visibles de l'extérieur fournis par la couche de liaison de données de bus de terrain Type 18 en termes:
- des actions et événements primitifs de service;
- des paramètres associés à chaque action primitive et événement primitif, et la forme qu'ils prennent;
- de l'interrelation entre ces actions et événements, et leurs séquences valides. Cette première édition et ses parties associées de la sous-série de la CEI 61158-3 annulent et remplacent la CEI 61158-3:2003. L'édition de cette partie constitue un ajout technique. Cette édition inclut les changements suivants:
- suppression du précédent bus de terrain de Type 6 et du réceptacle (placeholder) pour une couche de liaison de données de bus de terrain de Type 5 en raison d'un manque de pertinence commerciale;
- ajout de nouveaux types de bus de terrain;
- division de cette partie en plusieurs parties numérotées 3-1, 3-2, ...., 3-19. La présente version bilingue (2013-07) correspond à la version anglaise monolingue publiée en 2007-12.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-18. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 18 (IEC 61158-3-18:2007)

General Information

• Status: Published
• Publication Date: 14-Apr-2008
• 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: 14-Mar-2008
• Due Date: 19-May-2008
• Completion Date: 15-Apr-2008
• Ref Project: EN 61158-3-18:2008 - Industrial communication networks - Fieldbus specifications - Part 3-18: Data-link layer service definition - Type 18 elements

Relations

• Replaces: SIST EN 61158-3:2004 - Digital data communication for measurement and control - Fieldbus for use in industrial control systems -- Part 3: Data link service definition
• Effective Date: 29-Jan-2023
• Revised: SIST EN 61158-3:2004 - Digital data communication for measurement and control - Fieldbus for use in industrial control systems -- Part 3: Data link service definition
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61158-3-18:2008
01-junij-2008
1DGRPHãþD
SIST EN 61158-3:2004
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-18. del:
Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 18 (IEC 61158-3-
18:2007)
Industrial communication networks - Fieldbus specifications - Part 3-18: Data-link layer
service definition - Type 18 elements
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-18: Dienstfestlegungen des Data
Link Layer (Sicherungsschicht) - Typ 18-Elemente
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-18:
Définition des services des couches de liaison de données - Eléments de type 18
Ta slovenski standard je istoveten z: EN 61158-3-18:2008
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 61158-3-18:2008 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61158-3-18:2008

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SIST EN 61158-3-18:2008


EUROPEAN STANDARD
EN 61158-3-18

NORME EUROPÉENNE
February 2008
EUROPÄISCHE NORM

ICS 35.100.20; 25.040.40 Partially supersedes EN 61158-3:2004


English version


Industrial communication networks -
Fieldbus specifications -
Part 3-18: Data-link layer service definition -
Type 18 elements
(IEC 61158-3-18:2007)


Réseaux de communication industriels -  Industrielle Kommunikationsnetze -
Spécifications des bus de terrain - Feldbusse -
Partie 3-18: Définition des services Teil 3-18: Dienstfestlegungen
des couches de liaison de données - des Data Link Layer (Sicherungsschicht) -
Eléments de type 18 Typ 18-Elemente
(CEI 61158-3-18:2007) (IEC 61158-3-18:2007)




This European Standard was approved by CENELEC on 2008-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-3-18:2008 E

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SIST EN 61158-3-18:2008
EN 61158-3-18:2008 - 2 -
Foreword
The text of document 65C/473/FDIS, future edition 1 of IEC 61158-3-18, 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 was approved by CENELEC as EN 61158-3-18 on 2008-02-01.
This and the other parts of the EN 61158-3 series supersede EN 61158-3:2004.
With respect to EN 61158-3:2004 the following changes were made:
– deletion of Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market
relevance;
– addition of new fieldbus types;
– partition into multiple parts numbered 3-1, 3-2, …, 3-19.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-02-01
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
EN 61784 series. Use of the various protocol types in other combinations may require permission from their respective
intellectual-property-right holders.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61158-3-18:2007 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 61158-2 NOTE  Harmonized as EN 61158-2:2008 (not modified).
IEC 61158-4-18 NOTE  Harmonized as EN 61158-4-18:2008 (not modified).
IEC 61158-5-18 NOTE  Harmonized as EN 61158-5-18:2008 (not modified).
IEC 61158-6-18 NOTE  Harmonized as EN 61158-6-18:2008 (not modified).
IEC 61784-2 NOTE  Harmonized as EN 61784-2:2008 (not modified).
__________

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SIST EN 61158-3-18:2008
- 3 - EN 61158-3-18:2008

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year
1) 2)
ISO/IEC 7498-1 - Information technology - Open Systems EN ISO/IEC 7498-1 1995
Interconnection - Basic Reference Model: The
Basic Model


1)
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
Naming and addressing


1)
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI services




1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 61158-3-18:2008

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SIST EN 61158-3-18:2008
IEC 61158-3-18
Edition 1.0 2007-12
INTERNATIONAL
STANDARD

Industrial communication networks – Fieldbus specifications –
Part 3-18: Data-link layer service definition – Type 18 elements


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 35.100.20; 25.040.40 ISBN 2-8318-9422-0

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SIST EN 61158-3-18:2008
– 2 – 61158-3-18 © IEC:2007(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
1.1 Overview .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 Common symbols and abbreviations .13
3.5 Conventions .13
4 Data link services .15
4.1 Overview .15
4.2 Primitives of the DLS.15
4.3 CYCLIC-DATA-UPDATE.15
4.4 ACYCLIC-DATA-TRANSMIT .16
4.5 MASTER-TRANSMISSION-TRIGGER.17
5 DL-management Services.17
5.1 Overview .17
5.2 Required services .17
5.3 ESTABLISH-MASTER-POLLED .17
5.4 ESTABLISH-SLAVE-POLLED.18
5.5 ESTABLISH-MASTER-PACKED.19
5.6 ESTABLISH-SLAVE-PACKED .19
5.7 RELEASE-CONNECTION .20
5.8 SUSPEND-CONNECTION .20
5.9 RESUME-CONNECTION .20
5.10 ACTIVATE-STANDBY-MASTER.21
5.11 ERROR .21
Bibliography.23

Table 1 – DLE station identifiers .15
Table 2 – CYCLIC-DATA-UPDATE parameters .15
Table 3 – ACYCLIC-DATA-TRANSMIT parameters.16
Table 4 – ESTABLISH-MASTER-POLLED parameters .18
Table 5 – Baud rate parameter values .18
Table 6 – ESTABLISH-SLAVE-POLLED parameters .18
Table 7 – ESTABLISH-MASTER-PACKED parameters .19
Table 8 – Baud rate parameter values .19
Table 9 – Bit width parameter values .19
Table 10 – ESTABLISH-SLAVE-PACKED parameters.20
Table 11 – RELEASE-CONNECTION parameters .20
Table 12 – SUSPEND-CONNECTION parameters .20

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SIST EN 61158-3-18:2008
61158-3-18 © IEC:2007(E) – 3 –
Table 13 – RESUME-CONNECTION parameters .21
Table 14 – ERROR parameters .21

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SIST EN 61158-3-18:2008
– 4 – 61158-3-18 © IEC:2007(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-18: Data-link layer service definition – Type 18 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
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 IEC 61784 series. Use of the various protocol types in other
combinations may require permission of their respective intellectual-property-right holders.
International Standard IEC 61158-3-18 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This first edition and its companion parts of the IEC 61158-3 subseries cancel and replace
IEC 61158-3:2003. This edition of this part constitutes a technical addition.
This edition includes the following significant changes with respect to the previous edition:
a) deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link
layer, for lack of market relevance;
b) addition of new types of fieldbuses;
c) division of this part into multiple parts numbered 3-1, 3-2, …, 3-19.

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SIST EN 61158-3-18:2008
61158-3-18 © IEC:2007(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65C/473/FDIS 65C/484/RVD

Full information on the voting for the approval of this 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.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
NOTE  The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
The list of all the parts of the IEC 61158 series, under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.

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SIST EN 61158-3-18:2008
– 6 – 61158-3-18 © IEC:2007(E)
INTRODUCTION
This part of IEC 61158 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/TR 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 standard is a conceptual architectural service,
independent of administrative and implementation divisions.

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SIST EN 61158-3-18:2008
61158-3-18 © IEC:2007(E) – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-18: Data-link layer service definition – Type 18 elements


1 Scope
1.1 Overview
This standard provides common elements for basic time-critical and non-time-critical
messaging communications between devices in an automation environment and material
specific to Type 18 fieldbus. 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 standard defines in an abstract way the externally visible service provided by the Type
18 fieldbus 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 which they
take; and
c) the interrelationship between these actions and events, and their valid sequences.
This standard defines the services provided to
• the Type 18 fieldbus application layer at the boundary between the application and data-
link layers of the fieldbus reference model, and
• system 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 standard 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, and
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This standard does not specify individual implementations or products, nor do they 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 18 data-link layer services defined in this standard.

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SIST EN 61158-3-18:2008
– 8 – 61158-3-18 © IEC:2007(E)
2 Normative references
The following referenced documents are indispensable for the application 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.
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
3 Terms, definitions, symbols, abbreviations and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviations
and conventions apply.
3.1 Reference model terms and definitions
This standard 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.
[ISO/IEC 7498-3]
3.1.1 DL-address
[ISO/IEC 7498-1]
3.1.2 DL-address-mapping
[ISO/IEC 7498-3]
3.1.3 called-DL-address
[ISO/IEC 7498-3]
3.1.4 calling-DL-address
[ISO/IEC 7498-1]
3.1.5 centralized multi-end-point-connection
[ISO/IEC 7498-1]
3.1.6 DL-connection
[ISO/IEC 7498-1]
3.1.7 DL-connection-end-point
[ISO/IEC 7498-1]
3.1.8 DL-connection-end-point-identifier
[ISO/IEC 7498-1]
3.1.9 DL-connection-mode transmission
[ISO/IEC 7498-1]
3.1.10 DL-connectionless-mode transmission
[ISO/IEC 7498-1]
3.1.11 correspondent (N)-entities
correspondent DL-entities  (N=2)
correspondent Ph-entities  (N=1)
[ISO/IEC 7498-1]
3.1.12 DL-duplex-transmission
[ISO/IEC 7498-1]
3.1.13 (N)-entity
DL-entity  (N=2)
Ph-entity  (N=1)
[ISO/IEC 7498-1]
3.1.14 DL-facility
[ISO/IEC 7498-1]
3.1.15 flow control

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SIST EN 61158-3-18:2008
61158-3-18 © IEC:2007(E) – 9 –
[ISO/IEC 7498-1]
3.1.16 (N)-layer
DL-layer  (N=2)
Ph-layer  (N=1)
[ISO/IEC 7498-1]
3.1.17 layer-management
[ISO/IEC 7498-3]
3.1.18 DL-local-view
[ISO/IEC 7498-3]
3.1.19 DL-name
[ISO/IEC 7498-3]
3.1.20 naming-(addressing)-domain
[ISO/IEC 7498-1]
3.1.21 peer-entities
[ISO/IEC 7498-3]
3.1.22 primitive name
[ISO/IEC 7498-1]
3.1.23 DL-protocol
[ISO/IEC 7498-1]
3.1.24 DL-protocol-connection-identifier
[ISO/IEC 7498-1]
3.1.25 DL-protocol-data-unit
[ISO/IEC 7498-1]
3.1.26 DL-relay
[ISO/IEC 7498-1]
3.1.27 reset
[ISO/IEC 7498-3]
3.1.28 responding-DL-address
[ISO/IEC 7498-1]
3.1.29 routing
[ISO/IEC 7498-1]
3.1.30 segmenting
[ISO/IEC 7498-1]
3.1.31 (N)-service
DL-service  (N=2)
Ph-service  (N=1)
[ISO/IEC 7498-1]
3.1.32 (N)-service-access-point
DL-service-access-point  (N=2)
Ph-service-access-point  (N=1)
[ISO/IEC 7498-3]
3.1.33 DL-service-access-point-address
[ISO/IEC 7498-1]
3.1.34 DL-service-connection-identifier
[ISO/IEC 7498-1]
3.1.35 DL-service-data-unit
[ISO/IEC 7498-1]
3.1.36 DL-simplex-transmission
[ISO/IEC 7498-1]
3.1.37 DL-subsystem
[ISO/IEC 7498-1]
3.1.38 systems-management
[ISO/IEC 7498-1]
3.1.39 DLS-user-data

3.2 Service convention terms and definitions
This standard also makes use of the following terms defined in ISO/IEC 10731 as they apply
to the data-link layer:
3.2.1 acceptor
3.2.2 asymmetrical service

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SIST EN 61158-3-18:2008
– 10 – 61158-3-18 © IEC:2007(E)
3.2.3 confirm (primitive);
requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-confirmed-facility
3.2.6 DL-facility
3.2.7 DL-local-view
3.2.8 DL-mandatory-facility
3.2.9 DL-non-confirmed-facility
3.2.10 DL-provider-initiated-facility
3.2.11 DL-provider-optional-facility
3.2.12 DL-service-primitive;
primitive
3.2.13 DL-service-provider
3.2.14 DL-service-user
3.2.15 DLS-user-optional-facility
3.2.16 indication (primitive);
acceptor.deliver (primitive)
3.2.17 multi-peer
3.2.18 request (primitive);
requestor.submit (primitive)
3.2.19 requestor
3.2.20 response (primitive);
acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
3.3 Data-link service terms and definitions
3.3.1
DLE station identifier
network address assigned to a DLE
3.3.2
DLE station slot
unit (granularity of one) of position dependent mapping (for cyclic data field) of which a DLE
may occupy one or more, delineated by the range beginning at the DLE station identifier with
a length equal to the configured number of occupied slots
3.3.3
DL-segment, link, local link
single DL-subnetwork in which any of the connected DLEs may communicate directly, without
any intervening DL-relaying, whenever all of those DLEs that are participating in an instance
of communication are simultaneously attentive to the DL-subnetwork during the period(s) of
attempted communication

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SIST EN 61158-3-18:2008
61158-3-18 © IEC:2007(E) – 11 –
3.3.4
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-
layer entity
NOTE  This definition, derived from ISO/IEC 7498-1, is repeated here to facilitate understanding of the critical
distinction between DLSAPs and their DL-addresses.
3.3.5
DL(SAP)-address
either an individual DLSAP-address, designating a single DLSAP of a single DLS-user, or a
group DL-address potentially designating multiple DLSAPs, each of a single DLS-user
NOTE  This terminology is chosen because ISO/IEC 7498-3 does not permit the use of the term DLSAP-address to
designate more than a single DLSAP at a single DLS-user.
3.3.6
(individual) DLSAP-address
DL-address that designates only one DLSAP within the extended link
NOTE  A single DL-entity may have multiple DLSAP-addresses associated with a single DLSAP.
DLS-user-entity
DLS-user-entity
DLS-users
DLSAP DLSAP DLSAP
DLSAP-
address DLSAP-
DLSAP-
group DL-
address
addresses
address
DL-layer
DL-entity
PhSA P PhSA P
Ph-layer

NOTE 1  DLSAPs and PhSAPs are depicted as ovals spanning the boundary between two adjacent layers.
NOTE 2  DL-addresses are depicted as designating small gaps (points of access) in the DLL portion of a DLSAP.
NOTE 3  A single DL-entity may have multiple DLSAP-addresses and group DL-addresses associated with a
single DLSAP.
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses
3.3.7
extended link
DL-subnetwork, consisting of the maximal set of links interconnected by DL-relays, sharing a
single DL-name (DL-address) space, in which any of the connected DL-entities may
communicate, one with another, either directly or with the assistance of one or more of those
intervening DL-relay entities
NOTE  An extended link may be composed of just a single link.

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SIST EN 61158-3-18:2008
– 12 – 61158-3-18 © IEC:2007(E)
3.3.8
frame
denigrated synonym for DLPDU
3.3.9
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link
NOTE  A single DL-entity may have multiple group DL-addresses associated with a single DLSAP. A single
DL-entity also may have a single group DL-address associated with more than one DLSAP.
...