BS 1646-4-1984 Symbolic representation for process measurement control functions and instrumentation - Specification for basic symbols for process computer interface and shared dis.pdf

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1、BRITISH STANDARD BS 1646-4: 1984 Symbolic representation for process measurement control functions and instrumentation Part 4: Specification for basic symbols for process computer, interface and shared display/control functions UDC 53.08:681.2:003.62BS1646-4:1984 This British Standard, having been p

2、repared under the directionof the Industrial-process Measurementand Control Standards Committee, was published under the authorityofthe Board of BSI andcomes into effect on 30 April 1984 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference PCL/4 Draft for

3、 comment 82/31347 DC ISBN 0 580 13782 1 Committees responsible for 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/4 upon which the following bodies were represented:

4、 Association of Consulting Engineers British Industrial Measuring and Control Apparatus Manufacturers Association (BEAMA) Energy Industries Council Institute of Measurement and Control Institution of Gas Engineers Ministry of Defence Transmission and Distribution Association (BEAMA) Amendments issue

5、d since publication Amd. No. Date of issue CommentsBS1646-4:1984 BSI 02-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Definitions 1 3 Basic symbols 2 4 Examples of use of the symbols 4 Figure 1 Basic symbol for comput

6、er based functions 3 Figure 2 Basic symbol for shared display/control functions 4 Publications referred to Inside back coverBS1646-4:1984 ii BSI 02-1999 Foreword This Part of BS1646 has been prepared under the direction of the Industrial-process Measurement and Control Standards Committee and is tec

7、hnically equivalent to the International Electrotechnical Commission (IEC) document65 (Central Office)30 “Industrial-process measurement and control functions and instrumentation Symbolic representation Basic symbols for process computer, interface, and shared display/control functions”. This IEC do

8、cument is also technically equivalent to the International Organization for Standardization (ISO) draft international standard ISO/DIS3511/4 “Industrial process measurement control functions and instrumentation Symbolic representation, Part4: Basic symbols for process computer, interface, and shared

9、 display/control functions”. Which of the two international bodies will eventually publish the international standard has yet to be decided. However, rather than await the publication of the international standard, and in recognition of the urgent need of the industry for a standard with world-wide

10、application based on an international text, the decision has been taken to publish a corresponding British Standard. The text of this standard is based on the IEC document with some editorial corrections. It is anticipated that any differences between either the ISO or IEC standards and this British

11、 Standard will be of a minor nature. 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. Summ

12、ary of pages This document comprises a front cover, an inside front cover, pages i andii, pages1 to10, 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 theinside front

13、 cover.BS1646-4:1984 BSI 02-1999 1 0 Introduction This Part of BS1646 has been devised to provide a universal means of communication among the various interests involved in the design, manufacture, installation and operation of measurement and control equipment used in the process industries. Requir

14、ements within the industries vary considerably; in recognition of this, this British Standard is presented in four Parts, as follows: Part 1: Basic requirements (directed towards the needs of those employing comparatively simple measurements and control means); Part 2: Additional basic requirements;

15、 Part 3: Detailed symbols for instrument interconnection diagrams; Part 4: Basic symbols for process computer, interface and shared display/control functions. The four Parts together are intended to: a) meet the requirements of those who, possibly employing more sophisticated measurement and control

16、 means, may wish to depict such aspects as the measurement techniques embodied in a particular instrument, or the means hydraulic, pneumatic, electrical, mechanical used for its actuation; b) provide standard symbolic representation for process measurement control functions and instrumentation. Thes

17、e symbols are not intended to replace graphic symbols for electrical equipment as given in BS3939. 1 Scope and field of application This Part of BS1646 specifies symbols for the representation of process computer and shared/control functions in the field of process measurement and control. The symbo

18、ls established in this part have been developed to be used in conjunction with the symbols devised in BS1646-1 and BS1646-2 and are supplementary. They are intended to provide a means to illustrate process computer and/or shared display/control functions in the field of process measurement and contr

19、ol and may be used separately or combined with the symbols of BS1646-1 and BS1646-2. They will enable users to show and identify in a simple form the functions of instruments, the process computer and shared display/control functions or any combination of these. It is permissible to use the basic sy

20、mbol for computer based functions (see3.1) throughout for any software based digital system. This is not intended to preclude the use of the basic symbol for shared display/control functions (see3.2) if the user considers this to be appropriate. The symbols are intentionally limited to the identific

21、ation on process flow diagrams, etc and do not provide a means of illustrating specific instruments or parts thereof. The letter code for function identification is given in the Tables of BS1646-1 and BS1646-2. The application methods are shown in the examples. NOTEThe titles of the publications ref

22、erred to in this standard are listed on Inside back cover. 2 Definitions The definitions given in BS1646-1 and BS1646-2 equally apply to this Part of BS1646. The following definitions also apply. 2.1 programmable the capability of the system to accept computer language created by the user for perfor

23、ming control strategies or complex functions 2.2 process computer a programmable device that operates in real time on process data, on-line (primarily sensor based), to perform user specifiable supervision and/or control functionsBS1646-4:1984 2 BSI 02-1999 2.3 configurable the capability of the sys

24、tem to allow the user to select from pre-programmed functions (modular software units) those which are necessary to accomplish a control strategy or other complexfunctions, without the use of computer language 2.4 shared display/shared control shared functions, such as display, control and communica

25、tions, are shared in time, i.e.“time shared” functions. These functions are generally accomplished by a device containing pre-programmed algorithms that are user accessible, configurable and connectable to perform a given control strategy or function 2.5 distributed control system (DCS) the system d

26、esigned for process control purposes that always has a communication link(s) (data bus) but not necessarily a visual display unit (VDU), operator station(s) and/or a software link 2.6 software link the interconnection of system functions via keyboard or program instructions (soft wiring as opposed t

27、o hard wiring) 3 Basic symbols 3.1 Basic symbol for computer based functions. The symbol shall comprise: a) a thin line hexagon of approximately10mm width seeFigure 1(a) or an alternative thin line half circle; NOTE 1Several examples of the usage of the thin line half-circle are shown for reference

28、in clause4. b) a letter code in accordance with BS1646-1 and BS1646-2, showing the process computer functions. NOTE 2If required, a number may be included to facilitate identification. If only computer functions are provided, the basic symbol only may be used seeFigure 1(b). The basic symbol is usua

29、lly applied in conjunction with the basic symbols of BS1646-1 and BS1646-2 showing the measured process variable or actuated correcting unit seeFigure 1(c). Contiguous (touching) symbols imply communication between functions. NOTE 3The basic symbol may be rotated for drafting convenience. NOTE 4The

30、single horizontal line (seeBS1646-1) may be used to indicate the existence of an operator interface in the control room. NOTE 5The double horizontal line (seeBS1646-2) may be used to indicate accessibility at a local panel. NOTE 6This symbol is intended to represent computer and interface functions

31、performed by a programmable device. 3.2 Basic symbol for shared display/control functions. The symbol shall comprise: a) a thin line circle of approximately10mm diameter within a square seeFigure 2(a); b) a letter code in accordance with BS1646-1 and BS1646-2, showing the shared display/control func

32、tions. NOTE 1If required, a number may be included to facilitate identification. If only shared display/control functions are provided, the basic symbol only may be used seeFigure 2(b). The basic symbol is usually applied in conjunction with the basic symbols of BS1646-1 and BS1646-2 showing the mea

33、sured process variable or actuated correcting unit seeFigure 2(c). Contiguous (touching) symbols imply communication between functions. NOTE 2The basic symbol is not rotatable. NOTE 3The single horizontal line (seeBS1646-1) may be used to indicate the existence of an operator interface in the contro

34、l room. NOTE 4The double horizontal line (seeBS1646-2) may be used to indicate accessibility at a local panel. NOTE 5This symbol is intended to represent functions performed by a configurable device with shared functions for display and/or control.BS1646-4:1984 BSI 02-1999 3 Figure 1 Basic symbol fo

35、r computer based functionsBS1646-4:1984 4 BSI 02-1999 4 Examples of use of the symbols 4.1 Process computer examples 4.1.1 Pressure signal to computer Figure 2 Basic symbol for shared display/control functionsBS1646-4:1984 BSI 02-1999 5 4.1.2 Temperature signal to computer (input number211) with tem

36、perature recording and high alarm by computer (normally accessible to the operator) 4.1.3 Flow recording and control by computer 4.1.4 Control valve actuated by and position display (open-closed) on computer 4.1.5 Flow recording and control by computer; flow indication in control roomBS1646-4:1984 6

37、 BSI 02-1999 4.1.6 Pressure recording and control by computer with “back-up” by discrete instruments 4.1.7 Flow recording and control by computer; operator access in local control room, flow indication in central control roomBS1646-4:1984 BSI 02-1999 7 4.1.8 Cascade control and indication and record

38、ing of temperature by computer with “back-up” control and indication with common process connectionsBS1646-4:1984 8 BSI 02-1999 4.1.9 Cascade control and indication of level to flow by computer, with “back-up” control and indication 4.2 Shared display/control examples 4.2.1 Flow recording on shared

39、display 4.2.2 Shared control and recording of pressure, i.e. by distributed control (DCS) with pressure recording by a discrete instrument in control roomBS1646-4:1984 BSI 02-1999 9 4.2.3 Cascade control example LICA-106 DCS control (master) and low alarm LZA-107 “Hard-wired” trip system with its ow

40、n display, not duplicated in DCS, with its own alarm annunciation FRC-101 DCS recording control (slave of LICA-106) TA-110 “Hard-wired” high temperature alarm with its own display and duplicated on DCS with its own annunciation HS-103 “Hard-wired” local manual reset10 blankBS1646-4:1984 BSI 02-1999

41、Publications referred to BS 1646, Symbolic representation for process measurement control functions and instrumentation. BS 1646-1, Basic requirements. BS 1646-2, Specification for additional basic requirements. BS 1646-3, Specification for detailed symbols for instrument interconnection diagrams. B

42、S 3939, Graphical symbols for electrical power, telecommunications and electronics diagrams. BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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