1、CENELEC ENxb0870-5- 5 75 m 3404583 OLb7108 54b BRITISH STANDARD Telecontrol equipment and systems Part 5. Llransmission protocols Section 5 Basic application functions The European Standard EN 60870-55 : 1995 has the status of a Britjsh Standard ICs 33.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS
2、 PERMITTED BY COPYRIGHT LAW BS EN 60870-5-5 : 1996 EC 870-5-5 : 1995 CENELEC ENmb0870-5- 5 95 m 3404583 0367309 482 m BS EN 60870-5-5 : 1996 Amd. No. Committees responsible for this British Standard Date Text affected The preparation of this British Standard was entrusted to Technical Committee PEU5
3、7, Power system control and associated communications, upon which the following bodies were represented Association of Consulting Engineers BEAMA Ltd. BEAMA Metering Association MA) EEA (Association of Electronics, Telecommunications and BusineSc Equipment Electricity Association GAMBICA (BEAMA Ltd.
4、) ?i-ansmission and Distribution Association (BEAMA Ud.) Industries) This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1996 O BSI 1996 The following BSI r
5、eferences relate to the work on this standard Committee reference PEU57 Draft for comment 90/25650 DC ISBN O 580 24898 4 CENELEC EN*b0870-5- 5 95 3404583 OLb7LLO LT4 M BS EN 60870-5-5 : 1996 Contents Page Committees responsible Inside front cover National foreword ll Foreword 2 Text of EN 60870-5-5
6、4 i I CENELEC EN*b0870-5- 5 95 M 3404583 OLb7LLL 030 M BS EN 60870-5-5 : 1996 National foreword This British Standard has been prepared by Technical Committee PEU57 and is the English language version of EN 60870-55 : 1995 Telecontrol equipment and systems Part 5: Triznsmission protocols, Section 5:
7、 Basic application functions, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 870-5-5 1995 published by the International Electrotechnical Commission (IEC). Cross-references Publication referred to IEC 50(371) : 1984 IEC 870-1-1 : 1988 EN
8、60870-5-1 : 1993 (IEC 870-51 : 1990) (IEC 870-52 : 1992) (IEC 870-53 : 1992) EN 60870-5-2 : 1993 EN 60870-5-3 : 1992 EN 60870-54 : 1993 (IEC 870-5-4 : 1993) IS0 7498 : 1984 Corresponding British Standard BS 4727 Glossaqy of electrokchnicd, power, telecommunication, electronics, lighting and colour t
9、emns Part 2 Tm partiadar to power engineering Group 12 : 1990 Telecontrol temzinObgy BS 7404 Telecontrol equipment and systems Part 1 Geneml consWations Section 1.1 : 1991 Genemlprincipks BS EN 60870 Telecontrol equipment and systems Part 5 Transmission protocols Section 5.1 : 1994 Transmission fram
10、e formats Section 5.2 : 1994 Link transmission procedures Section 5.3 : 1992 Speficatitmfigmmcd structure of application data Section 5.4 : 1993 Definition and coding of application information elements BS 6568 Refrence model of open systems interconnection Part 1 : 1988 Basic refme model (incorpora
11、ting connectionless-mode transmission) Compliance with a British Standard does not of itself confer immunity from legal obligations. 11 O BSI 1996 EUROPEIN STNARD NORME EUROPENNE EUROP 1 contains pontanmus data Class 2 contains cydic data A-RD-DATA.ind *I I I I I I I I I I I I I I T A-M-OATA.req Fig
12、ure 10 - Sequential procedure, polling procedure - CENELEC EN*b0870-5- 5 95 3404583 0167137 347 M services Page 26 EN 60870-5-5 : 1995 CONTROLLED STATION 6.3 Cyclic data transmission Cyclic data transmission is used to provide a continuous updating function of current values of process variables in
13、telecontrol systems operating with balanced and unbalanced transmission procedures. This procedure is usually executed with low priority which means that it can be interrupted by event-triggered communication requests. 6.3.1 Description of sequential procedure (see figure 1 1) The application proces
14、s in the controlled station overwrites cyclically the actual values of process variables into a buffer memory. The actual value of this buffer memory is trans- mitted to the controlling station at cyclic intervals, see figure 11. The arrival of the data is indicated to the process in the controlling
15、 station by an A-CYCLIC-DATAhd. Application function of CONTROLLING STATION i i A-CYCLIC-DATAPeriod4.ind l l - 1 A-CYCLIC-DATAPeriodlO.ind * NOTE - CYCLIC-DATA can be a set of periodically acquired data that are transmitted by an independent transmission cycle. Figure 11 - Sequential procedure, cyclic data transmission
