1、 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 Rseaux de communication industriels Spcifications des bus de terrain Partie 3-20: Dfinition des ser
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20、munication networks Fieldbus specifications Part 3-20: Data-link layer service definition Type 20 elements Rseaux de communication industriels Spcifications des bus de terrain Partie 3-20: Dfinition des services de la couche liaison de donnes lments de type 20 INTERNATIONAL ELECTROTECHNICAL COMMISSI
21、ON COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 25.040.40; 35.100.20; 35.110 PRICE CODE CODE PRIX ISBN 978-2-8322-1717-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this p
22、ublication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 61158-3-20:2014 IEC 2014 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 General . 6 1.1Specification . 6 1.2Conformance . 6 1.3 2 Normative references
23、 . 7 3 Terms, definitions, symbols, abbreviations and conventions . 7 Reference model terms and definitions 7 3.1Service convention terms and definitions . 8 3.2Common data-link service terms and definitions 9 3.3Additional Type 20 data-link specific definitions . 10 3.4Common symbols and abbreviati
24、ons . 17 3.5Additional Type 20 symbols and abbreviations 17 3.6Common conventions 18 3.7 4 Type 20 Data-link layer services . 19 General . 19 4.1Data-link layer services . 20 4.2 Bibliography 27 Figure 1 Relationships of DLSAPs, DLSAP-addresses and group DL-addresses 9 Figure 2 Data exchange service
25、 . 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
26、primitive and parameters . 25 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 world
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36、blications. 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
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39、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. 4 IEC 61158-3-20:2014 IEC 2014 The text of this standard is based on the following documents: FDIS Rep
40、ort 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 ser
41、ies, 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
42、data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 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.
43、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 immediatel
44、y above. Thus, the data-link layer service defined in this standard is a conceptual architectural service, independent of administrative and implementation divisions. 6 IEC 61158-3-20:2014 IEC 2014 INDUSTRIAL COMMUNICATION NETWORKS FIELDBUS SPECIFICATIONS Part 3-20: Data-link layer service definitio
45、n Type 20 elements 1 Scope General 1.1 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 a
46、ctions 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 t
47、he 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 event
48、s, 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 s
49、ystems 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. Specification 1.2 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 M
