1、 IEC 61158-4-20 Edition 1.0 2014-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial communication networks Fieldbus specifications Part 4-20: Data-link layer protocol specification Type 20 elements Rseaux de communication industriels Spcifications des bus de terrain Partie 4-20: Spcification
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20、IONALE Industrial communication networks Fieldbus specifications Part 4-20: Data-link layer protocol specification Type 20 elements Rseaux de communication industriels Spcifications des bus de terrain Partie 4-20: Spcification du protocole de la couche liaison de donnes lments de type 20 INTERNATION
21、AL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 25.040.40; 35.100.20; 35.110 PRICE CODE CODE PRIX ISBN 978-2-8322-1728-3 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make s
22、ure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 61158-4-20:2014 IEC 2014 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 General . 7 1.1Specifications 7 1.2P
23、rocedures 7 1.3Applicability . 7 1.4Conformance . 7 1.5 2 Normative references . 8 3 Terms, definitions, symbols and abbreviations 8 Reference model terms and definitions 8 3.1Service convention terms and definitions . 9 3.2Common terms and definitions 10 3.3Additional Type 20 definitions 12 3.4Comm
24、on symbols and abbreviations . 18 3.5Data units 18 3.5.1Miscellaneous 18 3.5.2Additional Type 20 symbols and abbreviations 19 3.6 4 Data-link layer protocol specification 20 Overview . 20 4.1Parameters, timers and variables 21 4.2Parameters 21 4.2.1Timers . 22 4.2.2Variables . 22 4.2.3Logical link c
25、ontrol 23 4.3General DLPDU structure 23 4.3.1DLPDU specific encoding and procedures . 26 4.3.2Framing . 27 4.3.3Error detection . 27 4.3.4Slave response to communication error . 28 4.3.5Medium access control 30 4.4Overview . 30 4.4.1Master controlled medium access 31 4.4.2Burst mode controlled mediu
26、m access . 32 4.4.3Token passing summary 32 4.4.4XMIT machine . 33 4.4.5RECV machine 34 4.4.6Slave MAC machine 35 4.4.7Master MAC machine 38 4.4.8DL-management-information . 41 4.5 Bibliography 42 Figure 1 Relationships of DLSAPs, DLSAP-addresses and group DL-addresses 11 Figure 2 DLPDU Structure .
27、23 Figure 3 Delimiter Structure . 23 Figure 4 Construction of 1-octet address field 24 IEC 61158-4-20:2014 IEC 2014 3 Figure 5 Construction of 5-octet address field 25 Figure 6 APDU format 25 Figure 7 DLPDU framing 27 Figure 8 Two dimensional parity detection . 28 Figure 9 Communication error respon
28、se DLL payload 29 Figure 10 MAC state machines 31 Figure 11 Master controlled medium access 31 Figure 12 Burst mode controlled medium access . 32 Figure 13 XMIT state machine . 33 Figure 14 RECV state machine 34 Figure 15 Slave MAC state machine 36 Figure 16 Master MAC state machine 38 Table 1 Slave
29、 response to communication error . 29 Table 2 Communication error code values . 29 Table 3 Token passing . 32 Table 4 XMIT state transitions . 33 Table 5 RECV state transitions 35 Table 6 Slave MAC state transitions 37 Table 7 Master MAC state transitions. 39 Table 8 Master DL parameters . 41 Table
30、9 Slave DL parameters . 41 4 IEC 61158-4-20:2014 IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INDUSTRIAL COMMUNICATION NETWORKS FIELDBUS SPECIFICATIONS Part 4-20: Data-link layer protocol specification Type 20 elements FOREWORD 1) The International Electrotechnical Commission (IEC) is a worl
31、dwide 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 a
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36、ch 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 Publica
37、tion 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 no
38、t 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 techni
39、cal 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 P
40、ublications. 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
41、 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-pr
42、operty-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
43、 IEC 61784-2. International Standard IEC 61158-4-20 has been prepared by subcommittee 65C: Industrial networks, of IEC technical committee 65: Industrial-process measurement, control and automation. IEC 61158-4-20:2014 IEC 2014 5 The text of this standard is based on the following documents: FDIS Re
44、port on voting 65C/762/FDIS 65C/772/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 parts of the IEC 61158 series
45、, 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“
46、in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for th
47、e correct understanding of its contents. Users should therefore print this document using a colour printer. 6 IEC 61158-4-20:2014 IEC 2014 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 standar
48、ds in the set as defined by the “three-layer” fieldbus reference model described in IEC 61158-1. The data-link protocol provides the data-link service by making use of the services available from the physical layer. The primary aim of this standard is to provide a set of rules for communication expr
49、essed in terms of the procedures to be carried out by peer data-link entities (DLEs) at the time of communication. These rules for communication are intended to provide a sound basis for development in order to serve a variety of purposes: a) as a guide for implementors and designers; b) for use in the testing and procurement of equipment; c) as part of an agr
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