1、BRITISH STANDARD BS 7404-1.4: 1995 IEC 870-1-4: 1994 Telecontrol equipment and systems Part 1: General considerations Section 1.4: Guide for basic aspects of telecontrol data transmission and organization of standards BS 7404-5 and BS 7404-6BS7404-1.4:1995 This British Standard, having been prepared
2、 under the directionof the Electrotechnical Sector Board (E/1), was publishedunderthe authority ofthe Standards Board and comesintoeffect on 15March1995 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference PEL/57 Draft for comment 89/33071 DC ISBN 0 580 2
3、3571 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electrotechnical Sector Board to Technical Committee PEL/57, Power system control and associated communications, upon which the following bodies were represented: Association of Cons
4、ulting Engineers BEAMA Ltd. BEAMA Metering Association (BMA) Electricity Association Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Transmission and Distribution Association (BEAMA) Ltd. Amendments issued since publication Amd. No. Date CommentsBS7404-1.4:1995 BSI 10-1999 i Contents Pag
5、e Committees responsible Inside front cover National foreword ii 1 Scope and object 1 2 Reference documents 1 3 Definition of technical terms 3 4 Basic communication structures and protocol models 5 5 Data communication principles 8 6 Introduction to IEC 870-5 and IEC 870-6 14 Figure 1 Basic communi
6、cation structure Overview 17 Figure 2 Structure and overview of standards in the OSI reference model 18 List of references Inside back coverBS7404-1.4:1995 ii BSI 10-1999 National foreword This Section of BS 7404 has been prepared under the direction of the Electrotechnical Sector Board, and is iden
7、tical with IEC Publication 870-1-4:1994 Telecontrol equipment and systems Part 1: General considerations Section 4: Basic aspects of telecontrol data transmission and organization of standards IEC 870-5 and IEC 870-6, published by the International Electrotechnical Commission (IEC). References in th
8、e text to IEC 870-5 and IEC 870-6 should be read as references to BS 7404-5 and BS 7404-6. In the area of process control, especially in the area of telecontrol and SCADA systems, there is an increasing demand for real-time data transmission. Inherent in this type of application are requirements wit
9、h respect to data integrity and guaranteed transmission time. The applicability of a particular type of communication network with its associated protocols depends upon its ability to fulfil these requirements. This is a function of a number of factors, including: bandwidth; traffic load (normal and
10、 avalanche conditions); transmission quality; coding and encryption schemes; computing power of communication front-ends and nodes. Each candidate system should be evaluated in the light of all of these factors. In particular, approaches to telecontrol data communication based on the OSI (open-syste
11、m interconnection) family of protocols (which were conceived originally for application to inter-computer communication and not for telecontrol) should be examined very carefully from this point of view. BS 7404-1.1:1991 describes the general principles of the layout and the functions of telecontrol
12、 systems. Clause 6 of that publication gives already some overviews on the transmission of telecontrol data, but both the complexity of the data transmission systems, as well as their numerous applications need a closer look. Due to this fact, a large number of different publications dealing with st
13、andardization of telecontrol protocols will be published. Therefore, it is necessary to give an overview in this report relating to the basic aspects of telecontrol data transmission. Cross-references Publication referred to Corresponding British Standard BS 4727 Glossary of electrotechnical, power,
14、 telecommunications, electronics, lighting and colour terms IEC 50(371):1984 Part 2 Terms particular to power engineering Group 12:1990 Telecontrol terminology IEC 50(721):1991 Part 3 Terms particular to telecommunications and electronics Group 03:1992 Telegraphy, facsimile and data communications B
15、S 7404 Telecontrol equipment and systems Part 1 General considerations IEC 870-1-1:1988 Section 1.1:1991 General principles IEC 870-1-2:1989 Section 1.2:1991 Guide for specifications IEC 870-1-3:1990 Section 1.3:1991 GlossaryBS7404-1.4:1995 BSI 10-1999 iii The following items are under consideration
16、: The Technical Committee has reviewed the provisions of ISO 2382, ISO 7498, ISO 8072, ISO/IEC 8073, ISO 8326, ISO 8327, ISO 8509, ISO 8822, ISO 8823, together with CCITT Recommendations R36, R37, R38, V11, V21, V22, V23, V24, V26, V27, V28, V29, V32, X3, X20, X21, X21bis, X22, X24, X25, X28 and X29
17、, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this British Standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appl
18、ication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Publication referred to Corresponding British Standard IEC 870-5-1:1990 BS EN 60870-5-1:1994 Telecontrol equipment and systems Transmission protocols Frame formats BS 7404 Telecontrol equipment and
19、 systems Part 5 Transmission protocols IEC 870-5-2:1992 Section 5.2:1992 Link transmission procedures IEC 870-5-3:1992 BS EN 60870-5 Telecontrol equipment and systems Transmission protocols BS EN 60870-5-3:1992 Specification for general structure of application data IEC 870-5-4:1993 BS EN 60870-5-4:
20、1994 Definition and coding of application information elements BS 7404 Telecontrol equipment and systems IEC 870-5-5:199X Part 5 Transmission protocols Section 5.5:199X Basic application functions a IEC 870-5-X:199X Section 5.X:199X Telecontrol companion standards and profiles IEC 870-6-1:199X Secti
21、on 6.1:199X Application context and organization of standards b IEC 870-6-2:19XX Section 6.2:19XX Use of base standards (OSIlayers14) c IEC 870-6-3:19XX Section 6.3:199X Use of base standards (OSI layers 57) d IEC 870-6-4:199X Section 6.4:199X Network management e IEC 870-6-X:199X Section 6.X:199X F
22、unctional profiles a Will be published after IEC 870-5-5. b Will be published after IEC 870-6-1. c Will be published after IEC 870-6-2. d Will be published after IEC 870-6-3. e Will be published after IEC 870-6-4. Summary of pages This document comprises a front cover, an inside front cover, pages i
23、 to iv, pages 1 to 18, 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.iv blankBS7404-1.4:1995 BSI 10-1999 1 1 Scope and object This technical
24、report applies to telecontrol equipment and systems with coded bit serial data transmission for monitoring and control of geographically widespread processes. This report is intended as a brief tutorial on transmission techniques, equipment and protocols in view of their use in telecontrol systems.
25、It is thus intended as a guide to orient those using the standards defined in the series of IEC 870-5 and IEC 870-6. More precisely, it gives a frame of reference for evaluating solutions as well as defining and describing the key technical terms. Terms that are defined in IEC 50(371) and in IEC 870
26、-1-3 are complemented by further definitions in clause 3 of this report. It further provides: descriptions of applicable basic communication technologies; basic rules as to how different system layers (see clause 3) can be used together (i.e. which combinations of standards in different layers are t
27、echnically coherent and which are not). It is not intended to recommend or impose solutions, this being the role of IEC 870-5 and IEC 870-6. 2 Reference documents IEC 50(371):1984, International Electrotechnical Vocabulary (IEV) Chapter 371: Telecontrol. IEC 50(721):1991, International Electrotechni
28、cal Vocabulary (IEV) Chapter 721: Telegraphy, facsimile and data communication. IEC 870-1-1:1988, Telecontrol equipment and systems Part 1: General considerations Section1:General principles. IEC 870-1-2:1989, Telecontrol equipment and systems Part 1: General considerations Section2:Guidefor specifi
29、cations. IEC 870-1-3:1990, Telecontrol equipment and systems Part 1: General considerations Section3:Glossary. IEC 870-5-1:1990, Telecontrol equipment and systems Part 5: Transmission protocols Section1:Transmission frame formats. IEC 870-5-2:1992, Telecontrol equipment and systems Part 5: Transmiss
30、ion protocols Section2:Linktransmission procedures. IEC 870-5-3:1992, Telecontrol equipment and systems Part 5: Transmission protocols Section3:General structure of application data. IEC 870-5-4:1993, Telecontrol equipment and systems Part 5: Transmission protocols Section4:Definition and coding of
31、application information elements. IEC 870-5-5:199x, Telecontrol equipment and systems Part 5: Transmission protocols Section5:Basicapplication functions. (under consideration) IEC 870-5-x:199x, Telecontrol equipment and systems Part 5: Transmission protocols Sectionx:Telecontrol companion standards
32、and profiles. (under consideration) IEC 870-6-1:199x, Telecontrol equipment and systems Part 6: Telecontrol protocols compatible with ISO and CCITT standards Section 1: Application context and organization of standards. (underconsideration) IEC 870-6-2:199x, Telecontrol equipment and systems Part 6:
33、 Telecontrol protocols compatible with ISO and CCITT standards Section 2: Use of base standards (OSI layers 14). (under consideration) IEC 870-6-3:199x, Telecontrol equipment and systems Part 6: Telecontrol protocols compatible with ISO and CCITT standards Section 3: Use of base standards (OSI layer
34、s 57). (under consideration) IEC 870-6-4:199x, Telecontrol equipment and systems Part 6: Telecontrol protocols compatible with ISO and CCITT standards Section 4: Network management. (under consideration) IEC 870-6-x:199x, Telecontrol equipment and systems Part 6: Telecontrol protocols compatible wit
35、h ISO and CCITT standards Section x: Functional profiles. (under consideration) ISO 2382, Information technology Vocabulary. ISO 7498:1984, Information processing systems Open Systems Interconnection Basic reference model. ISO 8072:1986, Information processing systems Open Systems Interconnection Tr
36、ansport service definition. BS7404-1.4:1995 2 BSI 10-1999 ISO/IEC 8073:1992, Information technology Telecommunications and information exchange between systems Open Systems Interconnection Protocol for providing the connection-mode transport service. ISO 8326:1987, Information processing systems Ope
37、n Systems Interconnection Basic connection oriented session service definition. ISO 8327:1987, Information processing systems Open Systems Interconnection Basic connection oriented session protocol specification. ISO 8509:1987, Information processing systems Open Systems Interconnection Service conv
38、entions. ISO 8822:1988, Information processing systems Open Systems Interconnection Connection oriented presentation service definition. ISO 8823:1988, Information processing systems Open Systems Interconnection Connection oriented presentation protocol specification. CCITT Recommendation R 35:1989,
39、 Blue Book, Fascicle VII.1, Standardization of FMVFT systems for a modulation rate of 50 bauds. CCITT Recommendation R 36:1989, Blue Book, Fascicle VII.1, Coexistence of 50-baud/120-Hz channels, 100-baud/240-Hz channels, 200-baud/360-Hz or 480-Hz channels on the same voice-frequency telegraph system
40、. CCITT Recommendation R 37:1989, Blue Book, Fascicle VII.1, Standardization of FMVFT systems for a modulation rate of 100 bauds. CCITT Recommendation R 38 A:1989, Blue Book, Fascicle VII.1, Standardization of FMVFT systems for a modulation rate of 200 bauds with channels spaced at 480 Hz. CCITT Rec
41、ommendation V 11:1989, Blue Book, Fascicle VIII.1, Electrical characteristics for balanced double-current interchange circuits for general use with integrated circuit equipment in the field of data communications. CCITT Recommendation V 21:1989, Blue Book, Fascicle VIII.1, 300 bits per second duplex
42、 modem standardized for use in the general switched telephone network. CCITT Recommendation V 22:1989, Blue Book, Fascicle VIII.1, 1 200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits. CCITT Reco
43、mmendation V 23:1989, Blue Book, Fascicle VIII.1, 600/1 200-baud modem standardized for use in the general switched telephone network. CCITT Recommendation V 24:1989, Blue Book, Fascicle VIII.1, List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-termi
44、nating equipment (DCE). CCITT Recommendation V 26:1989, Blue Book, Fascicle VIII.1, 2 400 bits per second modem standardized for use on 4-wire leased telephone-type circuits. CCITT Recommendation V 27:1989, Blue Book, Fascicle VIII.1, 4 800 bits per second modem with manual equalizer standardized fo
45、r use on leased telephone-type circuits. CCITT Recommendation V 28:1989, Blue Book, Fascicle VIII.1, Electrical characteristics for unbalanced double-current interchange circuits. CCITT Recommendation V 29:1989, Blue Book, Fascicle VIII.1, 9 600 bits per second modem standardized for use on point-to
46、-point 4-wire leased telephone-type circuits. CCITT Recommendation V 32:1989, Blue Book, Fascicle VIII.1, A family of 2-wire, duplex modems operating at data signalling rates of up to 9 600 bits/s for use on the general switched telephone network and on leased telephone-type circuits. CCITT Recommen
47、dation X 3:1989, Blue Book, Fascicle VIII.2, Packet assembly/disassembly facility (PAD) in a public data network. CCITT Recommendation X 20:1989, Blue Book, Fascicle VIII.2, Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for start-stop transmission servi
48、ces on public data networks. CCITT Recommendation X 21:1989, Blue Book, Fascicle VIII.2, Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for synchronous operation on public data networks. CCITT Recommendation X 21bis:1989, Blue Book, Fascicle VIII.2, Use
49、on public data networks of data terminal equipment (DTE) which is designed for interfacing to asynchronous duplex V-series modems. BS7404-1.4:1995 BSI 10-1999 3 CCITT Recommendation X 22:1989, Blue Book, Fascicle VIII.2, Multiplex DTE/DCE interface for user classes 36. CCITT Recommendation X 24:1989, Blue Book, Fascicle VIII.2, List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment
