1、BRITISH STANDARD BS5863-2: 1980 IEC381-2: 1978 Analogue signals for process control systems Part2: Specification for direct voltage signals UDC 65.011.56:681.527.7:621.391.3.024:621.372.037.33BS5863-2:1980 This BritishStandard, having been prepared under the directionof the Industrial-process Measur
2、ementand Control Standards Committee, was published under the authority ofthe Executive Board and comesinto effect on 31 March1980 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference PCL/1 Draft for comment75/26816 DC ISBN 0 580 11127 X Cooperating organi
3、zations The Industrial-process Measurement and Control Standards Committee, under whose direction this BritishStandard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: British Gas Corporation British Industrial Measuring
4、and Control Apparatus Manufacturers Association* British Steel Corporation CBMPE* Control and Automation Manufacturers Association (BEAMA)* Department of Industry (Computers Systems and Electronics) Electrical, Electronic, Telecommunications and Plumbing Union Electricity Supply Industry in England
5、and Wales* Electronic Engineering Association Engineering Equipment Users Association* Institute of Measurement and Control* Institution of Electrical Engineers Institution of Gas Engineers Oil Companies Materials Association* Post Office Engineering Union Scientific Instrument Manufacturers Associa
6、tion* SIRA Institute The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this BritishStandard: British Pressure Gauge Manufacturers Association Ministry of Defence National Coal Board N
7、ational Water Council Amendments issued since publication Amd. No. Date of issue CommentsBS5863-2:1980 BSI 11-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope 1 2 Definitions 1 3 Specified values 1 Table I Ranges of analogue direct voltage signals 1 Publ
8、ications referred to Inside back coverBS5863-2:1980 ii BSI 11-1999 National foreword This BritishStandard has been prepared under the direction of the Industrial-process Measurement and Control Standards Committee and is identical with Publication381-2 “Analogue signals for process control systems”
9、Part2 “Direct voltage signals” published by the International Electrotechnical Commission (IEC) in1978. This BritishStandard is issued as a Part2 in anticipation of the revision of IEC Publication381:1971 “Analogue d.c. current signals for process control systems” and IEC Publication381A:1975 “First
10、 Supplement to Publication381:1971”. When revised, these IEC Publications will be combined as IEC Publication381-1 second edition. An identical BritishStandard will then be prepared as Part1 of BS5863 and BS3586:1970 will be withdrawn. Terminology and conventions. The text of the International Stand
11、ard has been approved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in BritishStandards. The scope clause of the IEC Publication is unclear and for the purposes of this BritishStandard it should be und
12、erstood that it is applicable to transmission over short distances only. The reference in paragraph2 to IECPublication381(1971) is for information only and the related BritishStandard is BS3586:1970 “Analogue direct current signals for telemetry and control”. It should be noted that although3.2 does
13、 not specify the value of the ripplecontent, it is important nevertheless to establish the value and the frequencies of both the ripple content and any internally generated noise within a system element when a ripple-free d.c. power supply is used. Moreover, when the d.c.power supply is not ripple-f
14、ree the value of its ripple content should be given. 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 o
15、bligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, 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
16、the inside front cover.BS5863-2:1980 BSI 11-1999 1 1 Scope This standard specifies analogue direct voltage signals used in industrial process measurement and control systems to transmit information between the elements of systems. Contrary to the analogue direct current signal as specified in IEC Pu
17、blication381, AnalogueD.C.Current Signals for Process Control Systems, the analogue direct voltage signal is not intended for transmission over long distances. This standard does not apply to signals used entirely within an element. 2 Definitions 2.1 elements of industrial process measurement and co
18、ntrol systems functional units, or integrated combinations thereof, which ensure the transducing, transmitting or processing of measured values, control quantities, control variables and reference variables 2.2 analogue direct voltage signal a direct voltage signal used for transmission or processin
19、g which varies in a continuous manner according to one or several physical quantities 2.3 measured value of an analogue direct voltage signal the mean value during a stated duration 2.4 lower limit the signal voltage corresponding to the minimum value of the direct voltage signal 2.5 upper limit the
20、 signal voltage corresponding to the maximum value of the direct voltage signal 2.6 range of an analogue direct voltage signal the range determined by the lower limit and the upper limit of the signal voltage 2.7 load impedance the resultant of the impedances of all connected receivers 2.8 ripple co
21、ntent the ratio between the peak-to-peak value of the alternating component and the upper limit of the direct voltage signal 2.9 signal common a number of signal circuits may have common electrical connection. This is the signal common, which may or may not be connected to earth 2.10 signal isolatio
22、n the absence of an electrical connection between the signal circuit and all other circuits and earth 3 Specified values 3.1 Ranges of analogue direct voltage signals The ranges of analogue direct voltage signals shall be as given in Table I. Table I Ranges of analogue direct voltage signals 3.2 Rip
23、ple content The following values, applicable when using a ripple free d.c. power supply, should be specified: a) the ripple content within a system element and its frequencies; b) the noise generated internally within a system element and its frequencies. The ripple content resulting from the d.c. p
24、ower supply ripple should also be specified. 3.3 Signal common For unipolar signals, the signal negative should be the signal common. If the signal common is connected to a d.c. power supply, it should be connected to the power supply negative. For bipolar signals, the signal neutral should be the s
25、ignal common. If the signal common is connected to a d.c. power supply, it should be connected to the power supply neutral. 3.4 Earthing For unipolar signals, if the element is to be earthed, the signal negative and/or the d.c. power supply negative, or neutral where appropriate, should be earthed.
26、For bipolar signals, if the element is to be earthed, the signal neutral and/or the d.c. power supply neutral should be earthed. Lower limit (V) Upper limit (V) +1 0 0 10 + 5 a + 5 a +10 a +10 b a Voltage signals which can be derived from the direct current signals specified in IEC Publication381. b
27、 Voltage signal which can represent physical quantities with inherent bipolar nature.2 blankBS5863-2:1980 BSI 11-1999 Publications referred to See national foreword.BS5863-2: 1980 IEC381-2: 1978 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national b
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