1、BRITISH STANDARD BS 5863-1: 1984 IEC 381-1: 1982 Analogue signals for process control systems Part 1: Specification for direct current signals UDC 681.527.7:621.391.3.024:621.372.037.33BS5863-1:1984 This British Standard, having been prepared under the directionof the Industrial-process Measurement
2、and Control Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 29February1984 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PCL/1 Draft for comment 76/27133 DC ISBN 0 580 13753 8 Committees responsible fo
3、r this British Standard The preparation of this British Standard was entrusted by the Industrial-process Measurement and Control Standards Committee (PCL/-) to Technical Committee PCL/1 upon which the following bodies were represented: British Gas Corporation British Pressure Gauge Manufacturers Ass
4、ociation Department of Energy, Gas Standards Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Materials Users Association Gambica (BEAMA Ltd.) Institution of Gas Engineers National Coal Board STC Water Regulations and Fittings Scheme The following
5、bodies were also represented in the drafting of the standard, through subcommittees and panels: British Steel Corporation Health and Safety Executive Institute of Measurement and Control Institution of Chemical Engineers SIRA Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS
6、5863-1:1984 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Definitions 1 3 Specified values 1 Table I Ranges of analogue direct current signals 1BS5863-1:1984 ii BSI 09-1999 National foreword This Part of BS5863 has been prepared under the dire
7、ction of the Industrial-process Measurement and Control Standards Committee. It is identical with IEC Publication381-1:1982 “Analogue signals for process control systems. Part1: Direct current signals” published by the International Electrotechnical Commission (IEC). It supersedes BS3586:1970, which
8、 is withdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards. A British Standard does not purpo
9、rt 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 cover, an inside front co
10、ver, pages i and ii, pages1and 2 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.BS5863-1:1984 BSI 09-1999 1 1 Scope This standard is applicable to analogue direct
11、current signals used in industrial-process measurement and control systems to transmit information between elements of systems. This standard does not apply to signals used entirely within an element. 2 Definitions 2.1 elements of industrial-process measurement and control systems functional units,
12、or integrated combinations thereof, which transduce, process or transmit measured values, controlling, controlled and reference variables 2.2 analogue direct current signal a direct current signal, which varies in a continuous manner within its ranges, used in industrial-process measurement and cont
13、rol systems to transmit information 2.3 range of an analogue direct current signal the range is all values of the signal which lie between defined limits 2.4 lower limit the specified lowest value of the range NOTEThe lower limit may be either zero or a finite value; when zero is used, this is calle
14、d “true zero”; when a finite value is used, this is called “live zero”. 2.5 upper limit the specified highest value of the range 2.6 load impedance the resultant of the impedances of all connected receiving elements and connecting lines within the signal circuit 2.7 ripple content of the direct curr
15、ent signal the ratio of the peak-to-peak value of the alternating component with respect to the analogue direct current signal range 2.8 signal circuit common a number of “signal” circuits may have a common direct electrical connection. This is the “signal” circuit common, which may, or may not, be
16、connected to earth 2.9 power supply the supply which enables a system element to generate direct current signals by supplying the necessary d.c.power 2.10 ripple content of the power supply voltage the ratio of the peak-to-peak value of the alternating component with respect to the nominal power sup
17、ply voltage 3 Specified values 3.1 Ranges of analogue direct current signals The ranges of analogue direct current signals shall be as given inTable I. Table I Ranges of analogue direct current signals 3.2 Out-of-range values of analogue direct current signals In the case of the preferred signal the
18、0mA-value is exclusively reserved for indication of a signal circuit or power supply failure. 3.3 Ripple content of the direct current signal The ripple content of the signal shall be specified, and shall not exceed3%. In cases where the information is taken from the instantaneous value of the signa
19、l, for example in digital system elements with fast multiplexed inputs, the ripple content shall be specified for the element. 3.4 Signal common The point in the signal circuit with the lowest potential shall be the signal common. If the signal common is connected to the power supply it shall be con
20、nected to the power supply negative terminal (or zero volt terminal in the case of a bipolar power supply). 3.5 Earthing If a signal circuit is to be earthed, the signal common or the power supply negative terminal (or zero volt terminal in the case of a bipolar power supply) shall be earthed. Lower
21、 limit (mA) Upper limit (mA) Notes 4 0 20 20 a b a Preferred values. b Non-preferred values. At some future date these will be withdrawn.BS5863-1:1984 2 BSI 09-1999 3.6 Load impedance A transmitting or control system element shall be capable of continuously driving any load between0and3007. 3.7 Powe
22、r supplies Any transmitting system element using a power supply external to it shall be capable of operating with a power supply voltage which can vary between20Vd.c.and30Vd.c. The ripple content of the power supply voltage shall be specified and shall not exceed10% of the nominal power supply volta
23、ge. A stabilized power supply may be used. For evaluation and comparison of system element characteristics, a reference power supply voltage of24Vd.c.is recommended.blankBS 5863-1: 1984 IEC 381-1: 1982 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent nat
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