SIST EN 61158-3-14:2012
(Main)Industrial communication networks - Fieldbus specifications - Part 3-14: Data-link layer service definition - Type 14 elements (IEC 61158-3-14:2010)
Industrial communication networks - Fieldbus specifications - Part 3-14: Data-link layer service definition - Type 14 elements (IEC 61158-3-14:2010)
2012-03-22 - Publication editing allocated to cpalagi@cencenelec.eu
Project handled under parallel procedures as FprEN 61158-300 and split into 5 parts to be published as EN 61158-3-12, 14, 19, 21 and 22.
Supersedes EN 61158-3-14:2008
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-14: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 14-Elemente (IEC 61158-3-14:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-14: Définition des services de couche liaison de données - Eléments de type 14 (CEI 61158-3-14:2010)
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-14. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 14 (IEC 61158-3-14:2010)
Ta del standarda IEC 61158 določa skupne elemente za osnovne časovno kritične sporočilne komunikacije med napravami v avtomatizacijskem okolju. Izraz »časovno kritičen« se uporablja za predstavljanje prisotnosti časovnega okna, v okviru katerega se zahteva dokončanje enega ali več določenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja določenih 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 zunanje vidno opravilo, ki ga zagotavlja nivo podatkovnih povezav procesnih vodil tipa 14 v zvezi z a) primitivnimi dejanji in dogodki opravila; b) parametri, povezanimi z vsakim primitivnim dejanjem in dogodkom, in obliko, ki jo prevzamejo; ter c) medsebojno povezavo med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji. Namen tega standarda je določiti opravila, ki se zagotavljajo za: – aplikacijski nivo procesnih vodil tipa 14 na meji med aplikacijskim nivojem in nivojem podatkovnih povezav referenčnega modela procesnih vodil ter – vodenje sistemov na meji med nivojem podatkovnih povezav in vodenje sistemov referenčnega modela procesnih vodil.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61158-3-14:2012
01-julij-2012
1DGRPHãþD
SIST EN 61158-3-14:2008
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-14. del:
Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 14 (IEC 61158-3-
14:2010)
Industrial communication networks - Fieldbus specifications - Part 3-14: Data-link layer
service definition - Type 14 elements (IEC 61158-3-14:2010)
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-14: Dienstfestlegungen des Data
Link Layer (Sicherungsschicht) - Typ 14-Elemente (IEC 61158-3-14:2010)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-14:
Définition des services de couche liaison de données - Eléments de type 14 (CEI 61158-
3-14:2010)
Ta slovenski standard je istoveten z: EN 61158-3-14:2012
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 61158-3-14:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-3-14:2012
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SIST EN 61158-3-14:2012
EUROPEAN STANDARD
EN 61158-3-14
NORME EUROPÉENNE
May 2012
EUROPÄISCHE NORM
ICS 25.040.40; 35.100.20; 35.110 Supersedes EN 61158-3-14:2008
English version
Industrial communication networks -
Fieldbus specifications -
Part 3-14: Data-link layer service definition -
Type 14 elements
(IEC 61158-3-14:2010)
Réseaux de communication industriels - Industrielle Kommunikationsnetze -
Spécifications des bus de terrain - Feldbusse -
Partie 3-14: Définition des services de Teil 3-14: Dienstfestlegungen des Data
couche liaison de données - Link Layer (Sicherungsschicht) -
Eléments de type 14 Typ 14-Elemente
(CEI 61158-3-14:2010) (IEC 61158-3-14:2010)
This European Standard was approved by CENELEC on 2012-03-28. 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61158-3-14:2012 E
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SIST EN 61158-3-14:2012
EN 61158-3-14:2012 - 2 -
Foreword
The text of document 65C/604/FDIS, future edition 2 of IEC 61158-3-14, 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 61158-3-14:2012.
The following dates are fixed:
(dop) 2012-12-28
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2015-03-28
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61158-3-14:2008.
EN 61158-3-14:2012 includes the following significant technical changes with respect to EN 61158-3-
14:2008:
provide stability date for the publication;
update the edition of IEC 61588;
update the Normative references and Bibliography;
update the value of Protocol type in 5.3.2;
correct the edit error;
specification changes for CPF3;
update of the requirements for all conformance classes;
update of the requirements for all conformance services.
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.
Endorsement notice
The text of the International Standard IEC 61158-3-14:2010 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/TR 61158-1 NOTE Harmonized as CLC/TR 61158-1.
IEC 61158-4-14 NOTE Harmonized as EN 61158-4-14.
IEC 61158-5-14 NOTE Harmonized as EN 61158-5-14.
IEC 61158-6-14 NOTE Harmonized as EN 61158-6-14.
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SIST EN 61158-3-14:2012
- 3 - EN 61158-3-14:2012
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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 61588 2009 Precision clock synchronization protocol for - -
networked measurement and control systems
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 8802-3 - Information technology - Telecommunications - -
and information exchange between systems -
Local and metropolitan area networks -
Specific requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access method
and physical layer specifications
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic reference model -
Conventions for the definition of OSI services
IETF RFC 768 - User Datagram Protocol - -
IETF RFC 791 - Internet Protocol - DARPA Internet Program - -
Protocol Specification
IETF RFC 793 - Transmission Control Protocol - DARPA - -
Internet Program Protocol Specification
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SIST EN 61158-3-14:2012
IEC 61158-3-14
®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-14: Data-link layer service definition – Type 14 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
S
ICS 25.04.40; 35.100.20; 35.110 ISBN 978-2-88912-067-3
® Registered trademark of the International Electrotechnical Commission
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SIST EN 61158-3-14:2012
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CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
1.1 Overview .6
1.2 Specifications.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.9
3.3 Data-link service terms and definitions .10
3.4 Symbols and abbreviations.13
3.5 Common conventions .15
4 DL service and concept .16
4.1 General .16
4.2 Services provided by the DLL.17
5 DL-management services .17
5.1 Overview .17
5.2 Non-periodic data annunciation .17
5.3 EndofNonPeriodicDataSendingAnnunciation service .19
5.4 DL-management for FRT applications.20
Bibliography.22
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses .11
Figure 2 – Communication model.16
Figure 3 – Sequence of non-periodic data annunciation service and end of non-
periodic data annunciation service .18
Table 1 – Non-periodic data annunciation primitives and parameters .18
Table 2 – EndofNonPeriodicDataSending service primitives and parameters .19
Table 3 – DL-management service primitives and parameters.20
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61158-3-14 © IEC:2010(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-14: Data-link layer service definition –
Type 14 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.
NOTE 1 Use of some of the associated protocol types is restricted by their intellectual-property-right holders. In
all cases, the commitment to limited release of intellectual-property-rights made by the holders of those rights
permits a particular data-link layer protocol type to be used with physical layer and application layer protocols in
type combinations as specified explicitly in the profile parts. Use of the various protocol types in other
combinations may require permission of their respective intellectual-property-right holders.
International Standard IEC 61158-3-14 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
• Provide stability date for the publication;
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• Update the edition of IEC 61588;
• Update the Normative references and Bibliography;
• Update the value of Protocol type in subclause 5.3.2;
• Correct the edit error;
• specification changes for CPF3;
• update of the requirements for all conformance classes;
• update of the requirements for all conformance services.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/604/FDIS 65C/618/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.
A list of all parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE 2 The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
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61158-3-14 © IEC:2010(E) – 5 –
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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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-14: Data-link layer service definition –
Type 14 elements
1 Scope
1.1 Overview
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
14 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 14 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.
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 14 data-link layer services defined in this standard.
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61158-3-14 © IEC:2010(E) – 7 –
2 Normative references
The following referenced documents are indispensable for the application of this standard. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 61588:2009, Precision clock synchronization protocol for networked measurement and
control system
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model – Basic Reference Model: The Basic Model
ISO/IEC 7498-3, Information technology – Open Systems Interconnection – Basic Reference
Model – Basic Reference Model: Naming and addressing
ISO/IEC 8802-3, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements – Part 3:
Carrier sense multiple access with collision detection (CSMA/CD) access method and
physical layer specifications
ISO/IEC 10731, Information technology – Open Systems Interconnection – Basic Reference
Model – Conventions for the definition of OSI services
IETF RFC 768, User Datagram Protocol, available at
IETF RFC 791, Internet protocol, available at
IETF RFC 793, Transmission Control Protocol, available at
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]
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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]
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]
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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);
acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
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3.3 Data-link service terms and definitions
3.3.1
communication macrocycle
set of basic cycles needed for a configured communication activity in a macro network
segment
3.3.2
communication phase
elapsed fraction of a cycle, measured from some fixed origin
3.3.3
communication scheduling
algorithms and operation for data transfers occurring in a deterministic and repeatable
manner
3.3.4
cyclic
repetitive in a regular manner
3.3.5
data DLPDU
DLPDU that carries a DLSDU from a local DLS-user to a remote DLS-user
3.3.6
destination FB Instance
FB instance that receives the specified parameters
3.3.7
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
3.3.8
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.
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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
3.3.9
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.
3.3.10
(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.
3.3.11
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.
3.3.12
FCS error
error that occurs when the computed frame check sequence value after reception of all the
octets in a DLPDU does not match the expected residual
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SIST EN 61158-3-14:2012
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3.3.13
frame
denigrated synonym for DLPDU
3.3.14
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link. 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
3.3.15
micro segment
part of a network where special scheduling is implemented
3.3.16
multipoint connection
connection from one node to many nodes
NOTE Multipoint connections allow data transfer from a single publisher to be received by many subscriber
nodes.
3.3.17
node
single DL-entity as it appears on one local link
3.3.18
offset
number of octets from a specially designated position
3.3.19
real-time
ability of a system to provide a required result in a bounded time
3.3.20
real-time communication
transfer of data in real-time
3.3.21
real-time Ethernet (RTE)
ISO/IEC 8802-3-based ne
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