SIST EN 61158-3-7:2008
Industrial communication networks - Fieldbus specifications - Part 3-7: Data-link layer service definition - Type 7 elements
Industrial communication networks - Fieldbus specifications - Part 3-7: Data-link layer service definition - Type 7 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 7 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 7 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.
Industrielle Kommunikationsnetze - Feldbusse - Teil 3-7: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 7-Elemente
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-7: Définition des services des couches de liaison de données - Eléments de type 7
La CEI 61158-3-7:2007 définit de manière abstraite le service visible de l'extérieur fourni par la couche de liaison de données de bus de terrain de Type 7 en termes:
- d'actions et événements primitifs du service;
- de 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 CEI 61158-3 annulent et remplacent la CEI 61158-3:2003. La présente édition de cette partie constitue une révision rédactionnelle. Cette édition inclut les modifications suivante:
- suppression du précédent bus de terrain de Type 6, et du paramètre fictif pour une couche de liaison de données des bus de terrain de Type 5, en raison d'un manque de pertinence avec le marché;
- 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 - 3-7. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 7 (IEC 61158-3-7:2007)
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 3-7. del: Definicija opravil na nivoju podatkovnih povezav - Elementi tipa 7 (IEC 61158-3-7:2007)Industrielle Kommunikationsnetze - Feldbusse - Teil 3-7: Dienstfestlegungen des Data Link Layer (Sicherungsschicht) - Typ 7-ElementeRéseaux de communication industriels - Spécifications des bus de terrain - Partie 3-7: Définition des services des couches de liaison de données - Eléments de type 7Industrial communication networks - Fieldbus specifications - Part 3-7: Data-link layer service definition - Type 7 elements35.110OmreževanjeNetworking35.100.20Podatkovni povezovalni slojData link layer25.040.40Merjenje in krmiljenje industrijskih postopkovIndustrial process measurement and controlICS:Ta slovenski standard je istoveten z:EN 61158-3-7:2008SIST EN 61158-3-7:2008en,de01-junij-2008SIST EN 61158-3-7:2008SLOVENSKI
STANDARDSIST EN 61158-3:20041DGRPHãþD
SIST EN 61158-3-7:2008
EUROPEAN STANDARD EN 61158-3-7 NORME EUROPÉENNE
EUROPÄISCHE NORM February 2008
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 61158-3-7:2008 E
ICS 35.100.20; 25.040.40 Partially supersedes EN 61158-3:2004
English version
Industrial communication networks -
Fieldbus specifications -
Part 3-7: Data-link layer service definition -
Type 7 elements (IEC 61158-3-7:2007)
Réseaux de communication industriels -
Spécifications des bus de terrain -
Partie 3-7: Définition des services
des couches de liaison de données -
Eléments de type 7 (CEI 61158-3-7:2007)
Industrielle Kommunikationsnetze -
Feldbusse -
Teil 3-7: Dienstfestlegungen des
Data Link Layer (Sicherungsschicht) -
Typ 7-Elemente (IEC 61158-3-7:2007)
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.
SIST EN 61158-3-7:2008
EN 61158-3-7:2008
- 2 -
Foreword The text of document 65C/473/FDIS, future edition 1 of IEC 61158-3-7, 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 61158-3-7 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 61158-3-7:2007 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 61158-4-7 NOTE
Harmonized as EN 61158-4-7:2008 (not modified). IEC 61158-5-7 NOTE
Harmonized as EN 61158-5-7:2008 (not modified). IEC 61158-6-7 NOTE
Harmonized as EN 61158-6-7:2008 (not modified). IEC 61784-1 NOTE
Harmonized as EN 61784-1:2008 (not modified). __________
SIST EN 61158-3-7:2008
- 3 - EN 61158-3-7:2008 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
ISO/IEC 7498-1 -1) Information technology - Open Systems Interconnection - Basic Reference Model:
The Basic Model EN ISO/IEC 7498-119952)
ISO/IEC 7498-3 -1) Information technology - Open Systems Interconnection - Basic Reference Model: Naming and addressing - -
ISO/IEC 10731 -1) 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. SIST EN 61158-3-7:2008
SIST EN 61158-3-7:2008
IEC 61158-3-7Edition 1.0 2007-12INTERNATIONAL STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-7: Data-link layer service definition – Type 7 elements
INTERNATIONAL ELECTROTECHNICAL COMMISSION VICS 35.100.20; 25.040.40 PRICE CODEISBN 2-8318-9413-1SIST EN 61158-3-7:2008
– 2 – 61158-3-7 © 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.9 3.4 Symbols and abbreviations.13 3.5 Common conventions.14 4 Data-link layer services and concepts.16 4.1 Field of application, object.16 4.2 General description of services.16 4.3 Sequences of primitives.21 4.4 Buffer writing.22 4.5 Buffer reading.24 4.6 Buffer transfer.25 4.7 Explicit request for buffer transfer.26 4.8 Unacknowledged message transfer.30 4.9 Acknowledged message transfer.32 Bibliography.35
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses.11 Figure 2 – General description of medium allocation.20 Figure 3 – Primitives associated with the buffer writing service.23 Figure 4 – Primitives associated with the buffer reading service.24 Figure 5 – Primitives associated with the buffer transfer service.25 Figure 6 – Primitives associated with the specified explicit request for a buffer transfer.28 Figure 7 – Primitives associated with the free explicit request for a buffer transfer.29 Figure 8 – Primitives associated with the unacknowledged message transfer request service.31 Figure 9 – Primitives associated with the acknowledged message transfer request service.33
Table 1 – Summary of DL-services and primitives for buffer transfers.22 Table 2 – Summary of DL-services and primitives for message exchanges.22 Table 3 – DL-Put primitives and parameters.23 Table 4 – DL-Get primitives and parameters.24 Table 5 – DL-Buffer-Sent primitive and parameter.26 Table 6 – DL-Buffer-Received primitive and parameter.26 Table 7 – DL-Spec-Update primitives and parameters.28 Table 8 – DL-Free-Update primitives and parameters.30 SIST EN 61158-3-7:2008
61158-3-7 © IEC:2007(E) – 3 –
Table 9 – DL-Message primitives and parameters.31 Table 10 – DL-Message-Ack primitives and parameters.33
SIST EN 61158-3-7:2008
– 4 – 61158-3-7 © IEC:2007(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ INDUSTRIAL COMMUNICATION NETWORKS – FIELDBUS SPECIFICATIONS –
Part 3-7: Data-link layer service definition – Type 7 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 61158-3-7 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 an editorial revision. 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. SIST EN 61158-3-7:2008
61158-3-7 © 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. SIST EN 61158-3-7:2008
– 6 – 61158-3-7 © 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. SIST EN 61158-3-7:2008
61158-3-7 © IEC:2007(E) – 7 –
INDUSTRIAL COMMUNICATION NETWORKS – FIELDBUS SPECIFICATIONS –
Part 3-7: Data-link layer service definition – Type 7 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 7 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 7 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 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 7 data-link layer services defined in this standard. SIST EN 61158-3-7:2008
– 8 – 61158-3-7 © 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: 3.1.1 DL-address [7498-3]3.1.2 DL-connection [7498-1]3.1.3 DL-connection-end-point [7498-1]3.1.4 DL-connection-end-point-identifier [7498-1]3.1.5 correspondent (N)-entities
correspondent DL-entities
(N=2)
correspondent Ph-entities
(N=1) [7498-1]3.1.6 (N)-entity
DL-entity
(N=2)
Ph-entity
(N=1) [7498-1]3.1.7 flow control [7498-1]3.1.8 (N)-layer
DL-layer
(N=2)
Ph-layer
(N=1) [7498-1]3.1.9 DL-name [7498-3]3.1.10 peer-entities [7498-1]3.1.11 primitive name [7498-3]3.1.12 DL-protocol [7498-1]3.1.13 DL-protocol-connection-identifier [7498-1]3.1.14 DL-protocol-data-unit [7498-1]SIST EN 61158-3-7:2008
61158-3-7 © IEC:2007(E) – 9 –
3.1.15 DL-relay [7498-1]3.1.16 (N)-service
DL-service
(N=2)
Ph-service
(N=1) [7498-1]3.1.17 (N)-service-access-point
DL-service-access-point
(N=2)
Ph-service-access-point
(N=1) [7498-1]3.1.18 DL-service-data-unit [7498-1]3.1.19 DLS-user-data [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 confirm (primitive);
requestor.deliver (primitive) 3.2.3 deliver (primitive) 3.2.4 DL-service-primitive;
primitive 3.2.5 DL-service-provider 3.2.6 DL-service-user 3.2.7 indication (primitive);
acceptor.deliver (primitive) 3.2.8 multi-peer 3.2.9 request (primitive);
requestor.submit (primitive) 3.2.10 requestor 3.2.11 response (primitive);
acceptor.submit (primitive) 3.2.12 submit (primitive) 3.3 Data-link service terms and definitions 3.3.1
acknowledgement response DLPDU information that the recipient of an acknowledged message emits in order to signal either the proper reception of the message or the lack of available resources to store the message, received by the DLE on the local link that emitted the message which requested the acknowledgement SIST EN 61158-3-7:2008
– 10 – 61158-3-7 © IEC:2007(E) 3.3.2
basic cycle sequence of scanning by the bus-arbitrator of a) a set of DLCEP-identifiers for variables, requests, and cyclical application messages; b) plus a window provided for aperiodic exchanges; c) plus a window provided for message services; d) plus a window provided for synchronization 3.3.3
basic transaction succession of DLPDUs related to a single DL-service instance 3.3.4
bus-arbitrator (BA) DLE that controls each data producer's right to access the medium NOTE
At any given instant one and only one bus-arbitrator is active in each DL-segment of a DL-subnetwork. 3.3.5
control field portion of an emitted or received DLPDU that gives the nature of the data exchanged and the type of exchange 3.3.6
destination address three octets specifying the DL-segment of the DLE to whom the message is sent, and the destination DLSAP’s sub-address within the local link 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
DL-segment, local link set of devices that respect the DL-protocol and that are interconnected through a PhL. Only one bus-arbitrator is active on a single DL-segment 3.3.9
DLCEP-identifier two octets specifying a link-local DLCEP-identifier associated with a system variable. A DLCEP-identifier uniquely designates a single DL-accessible variable within the local link 3.3.10
DLCEP-identifier DLPDU information that a bus-arbitrator emits to allocate the local link to a data publisher for the purpose of exchanging a variable 3.3.11
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. SIST EN 61158-3-7:2008
61158-3-7 © IEC:2007(E) – 11 –
PhSAP PhSAP DL-entity DLS-user-entity DLS-user-entity DLSAP DLSAP DLSAP DLSAP-
addresses group DL-
address DLSAP-
address Ph-layer DL-layer DLS-users DLSAP-
address
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 3.3.12
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. 3.3.13
(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. 3.3.14
end of message transaction indication DLPDU information that the source entity of a message emits in order to return link access control to the bus-arbitrator at the end of a message transaction 3.3.15
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. SIST EN 61158-3-7:2008
– 12 – 61158-3-7 © IEC:2007(E) 3.3.16
frame denigrated synonym for DLPDU 3.3.17
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 3.3.18
identified variable (or simply "variable") DLL system variable for which an associated DLCEP-identifier has been defined 3.3.19
invalid DLCEP-identifier DLCEP-identifier not recognized locally 3.3.20
macrocycle set of basic cycles needed for all cyclical DLCEP-identifiers to be scanned 3.3.21
message DLPDU identifier information that a bus-arbitrator emits to allocate the medium to a source DLE for a message transfer 3.3.22
message response DLPDU information that a data publisher emits in response to a message identifier DLPDU. This information is received and retained by the desired destination entity or entities 3.3.23
node single DL-entity as it appears on one local link 3.3.24
periodic scanning of variables action by the bus-arbitrator that guarantees the cyclical exchange of variables NOTE
This is the basic principle of the Type 7 DL-service and protocol. 3.3.25
published identified variable variable that corresponds to a DLCEP-identifier for which the DLE emits data 3.3.26
receiving DLS-user DL-service user that acts as a recipient of DLS-user-data NOTE
A DL-service user can be concurrently both a sending and receiving DLS-user. 3.3.27
request DLPDU identifier the information that a bus-arbitrator emits to allocate the medium to the initiator of an explicit request for a buffer transfer SIST EN 61158-3-7:2008
61158-3-7 © IEC:2007(E) – 13 –
3.3.28
request response DLPDU the information that the initiator of an explicit request for a buffer transfer emits in response to a request identifier DLPDU. This information is received by the bus-arbitrator 3.3.29
sending DLS-user DL-service user that acts as a source of DLS-user-data 3.3.30
source address three octets specifying the local link-id of the entity sending the message, and the source DLSAP’s sub-address within the local link 3.3.31
subscribed identified variable variable that corresponds to a DLCEP-identifier for which the DLE rece
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