1、BRITISH STANDARD BS EN 60870-5-1:1994 IEC 870-5-1: 1990 Incorporating Amendment No.1 Telecontrol equipment and systems Part 5: Transmission protocols Section 5.1 Transmission frame formats The European Standard EN60870-5-1:1993 has the status of a British Standard UDC 621.398:621.316.1:681.3.04BS EN
2、 60870-5-1:1994 This British Standard, havingbeen prepared under thedirectionof the Power ElectricalEngineering StandardsPolicy Committee, waspublished underthe authorityof the Standards Boardand comes into effecton 31 October1991 BSI06-1999 The following BSI references relate to the work on this st
3、andard: Committee reference PEL/89 Draft for comment89/33064 DC ISBN 0 580 20111 2 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 which
4、the following bodies were represented: Association of Consulting Engineers BAMEMA (BEAMA) BEAMA Ltd. EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) Electricity Supply Industry in United Kingdom GAMBICA (BEAMA Ltd.) North of Scotland Hydro-Electric Board Te
5、lecommunication Engineering and Manufacturing Association Transmission and Distribution Association (BEAMA Ltd.) Amendments issued since publication Amd. No. Date Comments 8113 March 1994 Indicated by a sideline in the marginBSEN 60870-5-1:1994 BSI 06-1999 i Contents Page Committees responsible Insi
6、de front cover National foreword ii Foreword 2 Introduction 3 1 Scope 5 2 Object 5 3 Requirements for data transmission in telecontrol systems 5 3.1 High data integrity and data consistency 5 3.2 Short telecontrol transfer time 5 3.3 Support of bit oriented (code transparent) data transmission 5 4 Q
7、uantified rating of data integrity 5 4.1 Quantitative requirements for data integrity in telecontrol systems 6 5 Quantified rating of transmission efficiency 8 6 Transmission protocol specifications 8 6.1 Physical layer 8 6.2 Link layer 9 6.2.1 Link service classes provided 9 6.2.2 Dialogue procedur
8、es 10 6.2.3 Standard frame synchronization 10 6.2.4 Standard frame formats 10 6.2.5 Synchronization in transmission channels using switched carrier frequency 18 6.2.6 Main application fields of the defined format classes 18 6.2.7 Use of HDLC (High level data link control)-protocols 19 Appendix A Eff
9、ect of signal quality supervision on transmission efficiency and data integrity 20 Appendix B Quantitative ratings of data integrity and transmission efficiency 24 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications
10、30 Figure 1 Data integrity classes 7 Figure A.1 Bit signal detection: 22 a) without and b) with signal quality supervision Figure A.2 Influence of signal quality supervision on frame transmission efficiency and on data integrity 23 Figure B.1 Residual errors of format classes FT1.1, FT1.2, FT2 and F
11、T3 28 Figure B.2 Frame transmission efficiency of format classes FT1.1, FT1.2, FT2 and FT3 29 Table 1 Standard frame formats and code specifications 12 Publication(s) referred to Inside back coverBSEN 60870-5-1:1994 ii BSI 06-1999 National foreword This Section of BS7404 has been prepared under the
12、direction of the Power Electrical Engineering Standards Policy Committee and is identical with IEC Publication870-5-1:1989 “Telecontrol equipment and systems Part5: Transmission protocols Section1 Transmission frame formats”, published by the international Electrotechnical Commission (IEC). In1993 t
13、he European Committee for Electrotechnical Standardization (CENELEC) accepted IEC870-5-1:1990 as European Standard EN60870-5-1:1993. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN60870-5-1 and any reference to BS7404-5.1 should be read as a refere
14、nce to BS EN60870-5-1. The international standard does not give the up-to-date relation 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. Part 1: General considerations; Section 1.1: Gener
15、al principles; Section 1.2: Guide for specifications; Section 1.3: Glossary; Section 1.4: Basic aspects of telecontrol data transmission 1) ; Part2: Operating conditions; Section 2.1: Specification for classes of environmental conditions and power supplies; Section 2.2: Specification for electromagn
16、etic compatibility and erosive and corrosive influences 2) ; Part 3: Specification for interfaces (electrical characteristics); Part 4: Specification for performance; Part 5: Transmission protocols; Section 5.1: Specification for transmission frame formats; Section 5.2: Specification for transmissio
17、n procedures; Section 5.3: Specification for structure of application data; Section 5.4: Specification for coding specifications of application data; Part 6: Specification for telecontrol protocols compatible with ISO and CCITT standards 2) . Cross-references 1) Will be published after IEC870-1-4 ha
18、s been published. 2) Not yet published, envisaged as future work by IEC. International standard Corresponding British Standard BS7404 Telecontrol equipment and systems IEC870-1-1:1988 Section1.1:1991 General principles (Identical) IEC870-5-2 Section5.2 Specification for transmission procedures (Iden
19、tical)BS EN 60870-5-1:1994 BSI 06-1999 iii A British 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
20、. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, theENtitle page, pages2 to30, 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 tab
21、le on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60870-5-1 September1993 UDC 621.398:621.316.1:681.3.04 Descriptors: Telecontrol, data transmission, open system interconnection, protocol, data structure, frame, format English version Telecontrol equipment and
22、systems Part5: Transmission protocols Section1: Transmission frame formats (IEC870-5-1:1990) Matriels et systmes de tlconduite Partie5: Protocoles de transmission Section un: Formats de trames de transmission (CEI870-5-1:1990) Fernwirkeinrichtungen und Fernwirksysteme Teil5: bertragungsprotokolle Ha
23、uptabschnitt eins: Telegrammformate (IEC870-5-1:1990) This European Standard was approved by CENELEC on1993-07-06. 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
24、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 m
25、ade 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, Denmark, Finland, France, Germany, Greece, Ice
26、land, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de
27、 Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref.No.EN60870-5-1:1993EEN60870-5-1:1993 BSI 06-1999 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC870-5-1:1990 could be accepted without textual changes,
28、 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 EN60870-5-1 on6 July1993. The following dates were fixed: Annexes designated “normative” are part
29、 of the body of the standard. In this standard, Annex ZA is normative. latest date of publication of an identical national standard (dop) 1994-08-01 latest date of withdrawal of conflicting national standards (dow) 1994-08-01IEC870-5-1:1990 BSI 06-1999 3 Introduction This section highlights specific
30、 requirements and conditions for data transmission in telecontrol systems and shows ways to meet those requirements. Existing standards for data transmission protocols are adopted where they fulfil the specific telecontrol requirements. In terms of the OSI (Open System Interconnection) reference mod
31、el of ISO-CCITT, which subdivides communication into seven layers, this specifies standards for the two lowest layers, namely the physical layer and the link layer. In particular the document specifies formats for bit serial frame transmission which comply with specified classes of data integrity. P
32、ublication870-5-2-2: Transmission Procedures (in preparation) will specify further standards for the link layer and for higher layers. This comprises dispositions for data contents within frames, i.e.services in various traffic modes and for various link and network configurations. The ultimate purp
33、ose of the communication function in process monitoring and control is to achieve maximum system consistency, i.e.there should be no discrepancies between the physical states of process variables and their image in the data base of the telecontrol system. This ultimate goal cannot be achieved comple
34、tely. The laws of causality dictate that the information about process states is delayed and environmental noise or component failures may falsify the information. All that can be expected is that the communication allows a high degree of system consistency to be maintained. For this reason the data
35、 transmission method shall support upgraded reliable and efficient information throughput in particular for short and urgent messages. The exploitation of the installed bandwidth with respect to these two qualities is the critical measure for telecontrol protocols, because the available bandwidths a
36、re limited. In an imperfect environment, however, high data integrity and efficient data transmission are conflicting properties: increasing demands for data integrity can be fulfilled at the expense of decreasing net speed of information flow. It is necessary, therefore, to find an acceptable compr
37、omise between these two properties, based on an analysis of the requirements. A pre-supposition for analytical treatment is the objective measurement of the required properties. Data transport is only one function of the total system. The speed and integrity requirements of data transmission shall b
38、e chosen to be consistent with the accuracy of the total system, i.e.all the system parameters should be matched. In addition to the required compromise between transmission speed and transmission integrity there are further conditions which influence the choice of an appropriate telecontrol protoco
39、l, as shown in the following diagram: IEC870-5-1:1990 4 BSI 06-1999IEC870-5-1:1990 BSI 06-1999 5 1 Scope This series of standards applies to telecontrol equipment and systems with coded bit serial data transmission for monitoring and controlling geographically widespread processes. This standard cov
40、ers asynchronous data transmission with half duplex and duplex link protocols operating with window size one for message transfers. 2 Object This section specifies the basic requirements for services to be provided by the link plus physical layers, for telecontrol applications. In particular it spec
41、ifies standards on coding, formating and synchronizing data frames of variable and fixed lengths which meet specified data integrity requirements. The specified block codes are suited for the transmission of bit serial frames over binary symmetric transmission channels using a memoryless bit encodin
42、g method. This means that the signal specification of each transmitted bit shall not depend on signals transmitted before that bit. NOTERecommendations for data transmission services using other than memoryless bit encoding methods (for example digital pulse duration modulation (DPDM), HDLC, etc.) a
43、nd duplex link protocols with window sizes greater than one are under consideration. 3 Requirements for data transmission in telecontrol systems According to the basic goals of telecontrol systems and to the particular environmental conditions, it is necessary that data transmission fulfils the foll
44、owing requirements: 3.1 High data integrity and data consistency Correct data transmission is required in the presence of harsh environmental conditions, such as electromagnetic interferences, differences in earth potential, ageing components and other sources of disturbance and noise incident on th
45、e transmission path. Under these conditions it is necessary to provide efficient protection of messages against: undetected bit errors; undetected frame errors caused by synchronization errors; undetected loss of information; gain of unintended information (i.e.simulation of messages by noise); sepa
46、ration or perturbation of coherent information. 3.2 Short telecontrol transfer time (see IEV371-08-16) Provision of short information transmission times by application of efficient frame transmission protocols, particularly for event initiated messages over transmission paths with limited bandwidth
47、and with uncertain noise characteristics. 3.3 Support of bit oriented (code transparent) data transmission No code restrictions on user data are required. The data link protocol accepts and transmits arbitrary bit sequence structures from the data source. 4 Quantified rating of data integrity A quan
48、titative specification of the data integrity in information transport systems is achieved by evaluating the contributions of the complement of data integrity, the non integrity of data. Basically there are two sources causing non integrity of data in a receiving station, namely: i) residual error rate (see IEV371-08-05)= ii) rate of residual information loss (see IEV371-08-09)=number of undetected wrong messages total number of messages sent -number of undetected lost messages total number of messages sent -IEC870-5-1:1990 6 BSI 06-1999 It is emphasized that only rates of undetecte
