1、BRITISH STANDARD BS EN 60870-5-2: 1994 IEC 870-5-2: 1992 Incorporating Amendment No.1 Telecontrol equipment and systems Part 5: Transmission protocols Section 5.2 Link transmission procedures The European Standard EN60870-5-2:1993 has the status of a British Standard UDC 621.398:621.316.1:681.3.04BS
2、EN60870-5-2:1994 This British Standard, having been prepared under the directionof the Power ElectricalEngineering StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15 October1992 BSI 07-1999 The following BSI references relate to the work on t
3、his standard: Committee reference PEL/89 Draft for comment89/27230 DC ISBN 0 580 21218 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to Technical Committee PEL/89, upon
4、which the following bodies were represented: Association of Consulting Engineers BAMEMA (BEAMA) BEAMA Ltd. EEA (the Association of Electronics, Telecommunications and Buisness Equipment Industries) Electricity Supply Industry in United Kingdom GAMBICA (BEAMA Ltd.) North of Scotland Hydro-Electric Bo
5、ard Telecommunication Engineering and Manufacturing Association Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Date Comments 8114 March 1994 Indicated by a sideline in the marginBSEN60870-5-2:1994 BSI 07-1999 i Contents Page Committees responsible
6、 Inside front cover National foreword iii Foreword 2 Introduction 3 1 Scope and object 3 1.1 Scope 3 1.2 Object 3 2 Normative references 3 3 Formats and structures of standard transmission frames 4 3.1 Format FT1.1 4 3.2 Format FT1.2 5 3.3 Format FT2 6 3.4 Format FT3 7 4 Service primitives and eleme
7、nts of transmission procedures 8 4.1 SEND/NO REPLY service 9 4.1.1 Service primitives 9 4.1.2 Transmission procedure 9 4.2 SEND/CONFIRM service 9 4.2.1 Service primitives 9 4.2.2 Transmission procedure 10 4.3 REQUEST/RESPOND service 10 4.3.1 Service primitives 10 4.3.2 Transmission procedures 10 5 U
8、nbalanced transmission 11 5.1 Specification of length, control and address fields 11 5.1.1 Length field 11 5.1.2 Control field 11 5.1.3 Address field 13 5.2 Unbalanced transmission services 13 5.3 Unbalanced transmission procedures 14 5.3.1 SEND/NO procedures 14 5.3.2 Undisturbed SEND/CONFIRM proced
9、ures 15 5.3.3 Disturbed SEND/CONFIRM procedures 15 5.3.4 Undisturbed REQUEST/RESPOND procedures 15 5.3.5 Disturbed REQUEST/RESPOND procedures 15 6 Balanced transmission 23 6.1 Specification of length, control, and address fields 23 6.1.1 Length field 23 6.1.2 Control field 23 6.1.3 Address field 24
10、6.2 Balanced transmission services 25 6.3 Balanced transmission procedures 25 6.3.1 SEND/NO REPLY procedures 25 6.3.2 Undisturbed SEND/CONFIRM procedures 26 6.3.3 Undisturbed procedures with data flow control 26 6.3.4 Disturbed SEND/CONFIRM procedures 26 Annex A (normative) Time out interval for rep
11、eated frame transmission 33BSEN60870-5-2:1994 ii BSI 07-1999 Page Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 39 Figure 1 Relationship between service primitives and transmission procedures for basic link ser
12、vices 8 Figure 2 Example of the interaction between a polling procedure and an event-initiated transmission 14 Figure 3 Unbalanced transmission procedures, undisturbed SEND/CONFIRM procedures 16 Figure 4 Unbalanced transmission procedures, disturbed SEND/CONFIRM procedures 17 Figure 5 Unbalanced tra
13、nsmission procedures, undisturbed REQUEST/RESPOND procedures 18 Figure 6 Unbalanced transmission procedures, undisturbed REQUEST/RESPOND procedures 19 Figure 7 Unbalanced transmission procedures, undisturbed REQUEST/RESPOND procedures 20 Figure 8 Unbalanced REQUEST/RESPOND transmission procedures, d
14、isturbed REQUEST frame 21 Figure 9 Unbalanced REQUEST/RESPOND transmission procedures, disturbed RESPOND frame 22 Figure 10 Example of the interaction of service primitives and transmission procedures in a balanced system 25 Figure 11 Balanced transmission procedures, undisturbed SEND/CONFIRM proced
15、ures 27 Figure 12 Balanced transmission procedures, data flow control 28 Figure 13 Balanced transmission procedures, disturbed SEND frame 29 Figure 14 Balanced transmission procedures, disturbed SEND and ignored CONFIRM frame 30 Figure 15 Balanced transmission procedures, disturbed CONFIRM frame 31
16、Figure 16 Balanced transmission procedures, disturbed channel in one direction 32 Figure A.1 Unbalanced transmission procedures, disturbed primary frame 35 Figure A.2 Unbalanced transmission procedures, disturbed secondary frame 36 Figure A.3 Balanced transmission procedures, disturbed primary frame
17、 37 Figure A.4 Balanced transmission procedures, disturbed secondary frame 38 Table 1 Unbalanced transmission, function codes of control field in messages sent from primary (PRM=1) 12 Table 2 Unbalanced transmission, function codes of control field in messages sent from secondary (PRM=0) 12 Table 3
18、Balanced transmission, function codes of control field in messages sent from primary (PRM=1) 24 Table 4 Balanced transmission, function codes of control field in messages sent from secondary (PRM=0) 24 List of references Inside back coverBSEN60870-5-2:1994 BSI 07-1999 iii National foreword This Sect
19、ion of BS7404 has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee and is identical with IECPublication870-5-2:1992 Telecontrol equipment and systems Part5:Transmission protocols Section2: Link transmission procedures, published by the International El
20、ectrotechnical Commission (IEC). In1993 the European Committee for Electrotechnical Standardization (CENELEC) accepted IEC870-5-2:1992 as European Standard EN60870-5-2:1993. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN60870-5-2 and any reference
21、 toBS7404-5.2 should be read as a reference to BS EN60870-5-2. The international standard does not give the up-to-date relationship between this Part of the IEC standard and the other published and envisaged Parts and Sections. Other Parts and Sections of this British Standard are as follows. Part1:
22、 General considerations; Section1.1: General principles; Section1.2: Guide for specifications; Section1.3: Glossary; Section1.4: Basic aspects of telecontrol data transmission 1) ; Part2: Operating conditions; Section2.1: Specification for classes of environmental conditions and power supplies; Sect
23、ion2.2: Specification for electromagnetic compatibility and erosive and corrosive influences 2) ; Part3: Specification for interfaces (electrical characteristics); Part4: Specification of performance; Part5: Transmission protocols Section5.1: Specification for transmission frame formats; Section5.2:
24、 Specification for link transmission procedures; Section5.3: Specification for structure of application data; Section5.4: Specification for coding specifications of application data; Part6: Specification for telecontrol protocols compatible with ISO and CCITT standards 2) . The Technical Committee h
25、as reviewed the provisions of IEC50(371):1984 to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. 1) Will be published after IEC870-1-4 has been published. 2) Not yet published, envisaged as future work by IEC. Cross-r
26、eferences International standard Corresponding British Standard BS7404 Telecontrol equipment and systems IEC870-1-1:1988 Section1.1:1991 General principles (Identical) IEC870-5-1:1990 Section5.1:1991 Specification for transmission frame formats (Identical)BSEN60870-5-2:1994 iv BSI 07-1999 A British
27、Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front co
28、ver, an inside front cover, pagesi to iv, theENtitle page, pages2 to40, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME
29、 EUROPENNE EUROPISCHE NORM EN60870-5-2 September1993 UDC 621.398:621.316.1:681.3.04 Descriptors: Teleprocessing, control processes, telecontrol, data transmission, open system interconnection, data transmission procedure, data multilink procedure, protocol, data structure, frame English version Tele
30、control equipment and systems Part5: Transmission protocols Section2: Link transmission procedures (IEC870-5-2:1992) Matriels et systmes de tlconduite Partie5: Protocoles de transmission Section2: Procdures de transmission de liaison de donnes (CEI870-5-2:1992) Fernwirkeinrichtungen und Fernwirksyst
31、eme Teil5: bertragungsprotokolle Hauptabschnitt2: bertragungsprozeduren der Verbindungsschicht (IEC870-5-2:1992) This European Standard was approved by CENELEC on 1993-07-06. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
32、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
33、(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 Aust
34、ria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komi
35、tee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN60870-5-2:1993 EEN60870-5-2:1993 BSI 07-1999 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Stan
36、dard IEC870-5-2:1992 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as European Standard. The reference document was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN60870-5-2 on6 July 1993. The fol
37、lowing dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A and Annex ZA are normative. latest date of publication ofan identical national standard (dop) 1994-08-01 latest date of withdrawal ofconflicting national standards (dow) 1994-08-01
38、IEC870-5-2:1992 BSI 07-1999 3 Introduction This section of IEC870-5 is part of a series which highlights specific requirements and conditions for data transmission in telecontrol systems and describes ways to meet those requirements. In terms of the OSI (Open System Interconnection) reference model
39、of ISO-CCITT, which subdivides communication into seven layers, this section is concerned with the procedures required by the second layer: the link layer. Section1 covers the two bottom layers: the physical layer and the link layer, the latter being explained in terms of admissible frame formats an
40、d rules for frame synchronization. This section specifies standard link transmission procedures which operate on the link layer. 1 Scope and object 1.1 Scope This section of IEC870-5 applies to telecontrol equipment and systems with coded bit serial data transmission for monitoring and controlling g
41、eographically widespread processes. The defined link procedures are restricted to message transmission sequences operating with size1 windows. This means that the link layer of the primary station (station that initiates a message transfer) accepts a request for a new message transfer only when a pr
42、eviously accepted request for a message transfer is terminated either successfully or with an error indication. The procedures are applicable to balanced and unbalanced transmission in telecontrol systems using half duplex or duplex transmission channels. 1.2 Object The standard transmission procedu
43、res defined by this section are applicable to point-to-point, multiple point-to-point, multipoint-star, multipoint-partyline and multipoint-ring configurations as described in4.4 of IEC870-1-1. The data transmission functions in these systems are composed of three basic types of link transmission se
44、rvices, namely: 1. SEND/NO REPLY2. SEND/CONFIRM3.REQUEST/RESPOND The two services SEND/CONFIRM and REQUEST/RESPOND consist of a sequence of non-separable dialogue elements between requesting stations and responding stations. The protocol defined in this section accepts and processes only a single li
45、nk transmission service at a time in each direction of a bidirectional communication system. Each transmission service is terminated either successfully or with error reports before the next transmission service begins. This means that the window size for successive packet transfers is1 and the spec
46、ified error recovery for the transmission services SEND/CONFIRM and REQUEST/RESPOND utilize the stop-and-wait method for automatic repeat requests (ARQ). In point-to-point configurations equipped with duplex channel operation, the defined protocol supports balanced transmission procedures, that is s
47、imultaneous data transmission services in both directions of the communication link. This enables outstations to report spontaneous events to the control station as they occur, without having to be polled. This reduces reporting delays and leads to faster data acquisition. However, the use of an ind
48、ividual duplex communications channel to each outstation leads to increased equipment costs. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this section of IEC870-5. At the time of publication, the editions indicated
49、were valid. All standards are subject to revision, and parties to agreements based on this section of IEC870-5 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC50(371):1984, International Electrotechnical Vocabulary (IEV) Chapter371: Telecontrol. IEC870-1-1:1988, Telecontrol equipment and systems Part1: General consi
