SIST EN 61158-3-20:2015
(Main)Industrial communication networks - Fieldbus specifications - Part 3-20: Data-link layer service definition - Type 20 elements (IEC 61158-3-20:2014)
Industrial communication networks - Fieldbus specifications - Part 3-20: Data-link layer service definition - Type 20 elements (IEC 61158-3-20:2014)
This International Standard 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 20 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 20 fieldbus application layer at the boundary between the application and datalink layers of the fieldbus reference model;
• systems management at the boundary between the data-link layer and systems management of the fieldbus reference model.
Type 20 DL-service provides both a connected and a connectionless subset of those services specified in ISO/IEC 8886.
1.2 Specification
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;
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 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 20 data-link layer services defined in this standard.
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-20: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 20-Elemente (IEC 61158-3-20:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-20: Définition des services de la couche liaison de données - Éléments de type 20 (CEI 61158-3-20:2014)
L'IEC 61158-3-20:2014 définit les services fournis à la couche application de bus de terrain Type 20 au niveau de la frontière entre les couches application et liaison de données du modèle de référence de bus de terrain et à la gestion des systèmes au niveau de la frontière entre la couche liaison de données et la gestion des systèmes selon le modèle de référence de bus de terrain. Le service DL de Type 20 fournit un sous-ensemble connecté et un sous-ensemble sans connexion des services spécifiés dans l'ISO/CEI 8886.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-20. del: Specifikacija protokola na ravni podatkovnih povezav - Elementi tipa 20 (IEC 61158-3-20:2014)
Ta mednarodni standard 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 standard na abstrakten način določa na zunaj vidno opravilo, ki ga zagotavlja podatkovna povezovalna raven procesnih vodil tipa 20 v smislu
a) preprostih dejanj in dogodkov opravila;
b) parametrov, povezanih z vsakim preprostim dejanjem in dogodkom, ter obliko, ki jo prevzamejo; in
c) medsebojnih povezav med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji.
Namen tega standarda je opredeliti opravila, ki se zagotavljajo za:
• aplikacijsko raven procesnih vodil tipa 20 na meji med aplikacijo in podatkovno povezovalno ravnjo referenčnega modela procesnega vodila;
• upravljanje sistemov na meji med podatkovno povezovalno ravnjo in upravljanjem sistemov referenčnega modela procesnega vodila.
Protokol na ravni podatkovnih povezav tipa 20 zagotavlja podsklop povezljivih storitev in storitev brez povezave, ki so opisane v standardu ISO/IEC 8886.
1.2 Specifikacija
Glavni cilj tega standarda je določiti značilnosti konceptualnih opravil nivoja podatkovnih povezav, primernih za časovno kritične komunikacije, ter tako dopolniti osnovni referenčni model OSI pri usmerjanju razvoja protokolov časovnih povezav za časovno kritične komunikacije. Drugotni cilj je zagotoviti načrte prehoda iz predhodno obstoječih industrijskih komunikacijskih protokolov. Ta specifikacija se lahko uporablja kot podlaga za formalne programske vmesnike podatkovne povezave. Vseeno ne gre za formalni programski vmesnik, pri čemer mora vsak tak vmesnik obravnavati izvedbena vprašanja, ki jih ta specifikacija ne zajema, vključno z:
a) velikostmi in oktetnim naročanjem različnih večoktetnih parametrov opravil;
b) korelacijo parnih primitivov za zahtevo in potrjevanje ali navedbo in odziv.
1.3 Skladnost
Ta standard ne določa posameznih implementacij ali izdelkov ter ne omejuje implementacije entitet podatkovnih povezav v okviru sistemov za industrijsko avtomatizacijo. Ta oprema ni skladna s standardom za specifikacijo protokola na ravni podatkovnih povezav. Skladnost se doseže prek implementacije ustreznega protokola podatkovnih povezav, ki izpolnjuje storitve ravni podatkovnih povezav tipa 20, ki je določen v tem standardu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61158-3-20:2015
01-marec-2015
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-20. del:
Specifikacija protokola na ravni podatkovnih povezav - Elementi tipa 20 (IEC 61158
-3-20:2014)
Industrial communication networks - Fieldbus specifications - Part 3-20: Data-link layer
service definition - Type 20 elements (IEC 61158-3-20:2014)
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-20: Dienstfestlegungen des Data
Link Layer (Sicherungsschicht) - Typ 20-Elemente (IEC 61158-3-20:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-20:
Définition des services de la couche liaison de données - Éléments de type 20 (CEI
61158-3-20:2014)
Ta slovenski standard je istoveten z: EN 61158-3-20:2014
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 61158-3-20:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-3-20:2015
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SIST EN 61158-3-20:2015
EUROPEAN STANDARD EN 61158-3-20
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 25.040.40; 35.100.20; 35.110
English Version
Industrial communication networks - Fieldbus specifications -
Part 3-20: Data-link layer service definition - Type 20 elements
(IEC 61158-3-20:2014)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 3-20:
bus de terrain - Partie 3-20: Définition des services de la Dienstfestlegungen des Data Link Layer
couche liaison de données - Éléments de type 20 (Sicherungsschicht) - Typ 20-Elemente
(CEI 61158-3-20:2014) (IEC 61158-3-20:2014)
This European Standard was approved by CENELEC on 2014-09-17. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61158-3-20:2014 E
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SIST EN 61158-3-20:2015
EN 61158-3-20:2014 - 2 -
Foreword
The text of document 65C/759/FDIS, future edition 1 of IEC 61158-3-20, 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 61158-3-20:2014.
The following dates are fixed:
(dop) 2015-06-17
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2017-09-17
• latest date by which the national standards conflicting with
the 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 [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 61158-3-20:2014 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 NOTE Harmonized as EN 61158-1.
IEC 61158-2 NOTE Harmonized as EN 61158-2.
IEC 61158-4-20 NOTE Harmonized as EN 61158-4-20.
IEC 61158-5-20 NOTE Harmonized as EN 61158-5-20.
IEC 61158-6-20 NOTE Harmonized as EN 61158-6-20.
1)
IEC 61784-1:2014 NOTE Harmonized as EN 61784-1 (not modified).
IEC 62591:2010 NOTE Harmonized as EN 62591:2010 (not modified).
1)
To be published.
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SIST EN 61158-3-20:2015
- 3 - EN 61158-3-20:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 8886 - Information technology - Open Systems - -
Interconnection - Data link service
definition
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
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SIST EN 61158-3-20:2015
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SIST EN 61158-3-20:2015
IEC 61158-3-20
®
Edition 1.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 3-20: Data-link layer service definition – Type 20 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-20: Définition des services de la couche liaison de données – Éléments
de type 20
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-1717-7
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61158-3-20:2015
– 2 – IEC 61158-3-20:2014 © IEC 2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
1.1 General . 6
1.2 Specification . 6
1.3 Conformance . 6
2 Normative references . 7
3 Terms, definitions, symbols, abbreviations and conventions . 7
3.1 Reference model terms and definitions . 7
3.2 Service convention terms and definitions . 8
3.3 Common data-link service terms and definitions . 9
3.4 Additional Type 20 data-link specific definitions . 10
3.5 Common symbols and abbreviations . 17
3.6 Additional Type 20 symbols and abbreviations . 17
3.7 Common conventions . 18
4 Type 20 Data-link layer services . 19
4.1 General . 19
4.2 Data-link layer services . 20
Bibliography . 27
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 9
Figure 2 – Data exchange service . 21
Figure 3 – Receive only data service . 21
Figure 4 – Cyclic data transfer service . 22
Table 1 – DL-DATA-EXCHANGE primitives and parameters . 22
Table 2 – DL-RECEIVE primitive and parameters . 24
Table 3 – DL-CYCLIC-DATA primitives and parameters . 24
Table 4 – DLM-SET primitive and parameters . 25
Table 5 – DLM-GET primitive and parameters . 25
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SIST EN 61158-3-20:2015
IEC 61158-3-20:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-20: Data-link layer service definition –
Type 20 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 61158-3-20 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
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SIST EN 61158-3-20:2015
– 4 – IEC 61158-3-20:2014 © IEC 2014
The text of this standard is based on the following documents:
FDIS Report on voting
65C/759/FDIS 65C/769/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 the ISO/IEC Directives, Part 2.
A 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.
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.
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SIST EN 61158-3-20:2015
IEC 61158-3-20:2014 © IEC 2014 – 5 –
INTRODUCTION
This standard 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 standard is a conceptual architectural service,
independent of administrative and implementation divisions.
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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-20: Data-link layer service definition –
Type 20 elements
1 Scope
1.1 General
This International Standard 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
20 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 20 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.
Type 20 DL-service provides both a connected and a connectionless subset of those services
specified in ISO/IEC 8886.
1.2 Specification
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;
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 does it constrain
the implementations of data-link entities within industrial automation systems.
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SIST EN 61158-3-20:2015
IEC 61158-3-20:2014 © IEC 2014 – 7 –
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 20 data-link layer services defined in this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 8886, Information technology – Open Systems Interconnection – Data link service
definition
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:
3.1.1 DL-address [ISO/IEC 7498-3]
3.1.2 DL-address-mapping [ISO/IEC 7498-1]
3.1.3 called-DL-address [ISO/IEC 7498-3]
3.1.4 calling-DL-address [ISO/IEC 7498-3]
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 [ISO/IEC 7498-1]
correspondent DL-entities
(N=2)
correspondent Ph-entities
(N=1)
3.1.12 DL-duplex-transmission [ISO/IEC 7498-1]
3.1.13 (N)-entity [ISO/IEC 7498-1]
DL-entity (N=2)
Ph-entity (N=1)
3.1.14 DL-facility [ISO/IEC 7498-1]
3.1.15 flow control [ISO/IEC 7498-1]
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3.1.16 (N)-layer [ISO/IEC 7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.17 layer-management [ISO/IEC 7498-1]
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 7498-3]
3.1.21 peer-entities [ISO/IEC 7498-1]
3.1.22 primitive name [ISO/IEC 7498-3]
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 7498-1]
3.1.28 responding-DL-address [ISO/IEC 7498-3]
3.1.29 routing [ISO/IEC 7498-1]
3.1.30 segmenting [ISO/IEC 7498-1]
3.1.31 (N)-service [ISO/IEC 7498-1]
DL-service (N=2)
Ph-service (N=1)
3.1.32 (N)-service-access-point [ISO/IEC 7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.33 DL-service-access-point-address [ISO/IEC 7498-3]
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 [ISO/IEC 7498-1]
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
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);
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acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
3.3 Common data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Many definitions are common to more than one protocol Type; they are not necessarily used by all protocol
Types.
3.3.1
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
3.3.2
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-
layer entity
Note 1 to entry: This definition, derived from ISO/IEC 7498-1, is repeated here to facilitate understanding of the
critical distinction between DLSAPs and their DL-addresses.
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
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3.3.3
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 1 to entry: 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.
3.3.4
(individual) DLSAP-address
DL-address that designates only one DLSAP within the extended link
Note 1 to entry: A single DL-entity may have multiple DLSAP-addresses associated with a single DLSAP.
3.3.5
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 1 to entry: An extended link may be composed of just a single link.
3.3.6
frame
denigrated synonym for DLPDU
3.3.7
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link
Note 1 to entry: 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.
3.3.8
node
single DL-entity as it appears on one local link
3.3.9
receiving DLS-user
DL-service user that acts as a recipient of DLS-user-data
Note 1 to entry: A DL-service user can be concurrently both a sending and receiving DLS-user.
3.3.10
sending DLS-user
DL-service user that acts as a source of DLS-user-data
3.4 Additional Type 20 data-link specific definitions
3.4.1
analog controller
controller designed for use with only 4-20 mA current signaling that meets all requirements of
a current input device or current output device
3.4.2
analog signal
low frequency current, predominantly 4-20 mA signal sent to or originating from a field device
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3.4.3
analog signal spectrum
frequencies from zero to 25 Hz at unit amplitude and decreasing at 40 dB per decade above
25 Hz
3.4.4
analog test filter
two-pole low-pass Butterworth filter with the cutoff frequency of 25 Hz
3.4.5
application
function or data structure for which data is consumed or produced
3.4.6
application object
object class that manages and provides the run time exchange of messages across the
network and within the network device
Note 1 to entry: Multiple types of application object classes may be defined.
3.4.7
application relationship
cooperative association between two or more application-entity-invocations for the purpose of
exchange of information and coordination of their joint operation
Note 1 to entry: This relationship is activated either by the exchange of application-protocol-data-units or as a
result of pre-configuration activities.
3.4.8
application relationship endpoint
context and behaviour of an application relationship as seen and maintained by one of the
application processes involved in the application relationship
Note 1 to entry: Each application process involved in the application relationship maintains its own application
relationship endpoint.
3.4.9
attribute
description of an externally visible characteristic or fe
...
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