1、 ISA-5.3-1 983, Graphic Symbols for Distributed ControVShared Display Instrumentation, Logic and Computer Systems ISBN 0-87664-707-7 Copyright O 1983 by the Instrument Society of America. All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, sto
2、red in a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), without the prior written permission of the publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709 Preface This preface is inc
3、luded for informational purposes and is not part of ISA-5.3-1 983. This Standard has been prepared as a part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. Towards th
4、is end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board, ISA, 67 Alexander Drive, P.O. Box 12277, Research Triangle Park, North Carolina 27709, telephone 91 9- 549-841 1, e-mail: standards8isa.org. The ISA Standards and
5、 Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benefits to USA users of ISA Standards of incor
6、porating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Towards this end this Department will endeavor to introduce SI and SI-acceptable metric units in all new and revised standards to the greatest extent possible. The Metric
7、Practice Guide, which has been published by the American Society for Testing and Materials as ANSI designation 221 0.1 (ASTM E380-76. IEEE Std. 268-1 975), and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conversion factors. The systems referenced in thi
8、s Standard are based on advances in control systems technology since the publication of ISA-33.1, “Instrumentation Symbols and Identification.“ During recent years, technology has evolved in terms of microprocessor-based systems presently manufactured by many companies as “Distributed Control System
9、s.“ These systems may include components identified as “computers“ as distinct from the integral processor, which derives the various functions of the system. The computer component may be integrated into the overall system, via the communication link, or it may be a stand-alone computer. In attempt
10、ing to implement these systems, the need for supplementary symbolism has become apparent. The symbols defined in ISA-S5.3 are intended to complement those of ISA-S5.1, “Instrumentation Symbols and Identification,“ for use on flow diagrams. In this way, the integration of distributed controllers and
11、process computers into the more traditional instrument systems - analog, binary, and digital - can be depicted clearly on flow diagrams and other documents to give an overall and comprehensive picture of how process variables are measured and controlled. Distributed control systems appear to be simi
12、lar to each other; however, they are so diverse in philosophy that there must be a generic way to document their application. The second printing of ISA-33.3, dated April 1983, was published to correct errors in the original 1982 edition. The definition for communication link, Section 3, has been co
13、rrected and an omitted abbreviation, C.R.T., added. Minor clarifications were also made to the Appendix A artwork. The ISA Standards Committee on Graphic Symbols for Distributed ControVShared Display Instrumentation, Logic, and Computer Systems, SP5.3, operates within the ISA Standards and Practices
14、 Department, Dr. Thomas J. Harrison, Vice President. The persons listed below served as members of the SP5.3 Committee. ISA-S5.3-1983 3 NAME D. E. Rapley, Chairman A. Bohnenberger, Secretary (deceased) R. Barber G. V. Barta G. Bennett J. Biggs R. V. Bins M. A. Blaschke C. T. Carroll W. Cohen W. M. D
15、illow R. E. Dragoo S. E. Gaertner L. K. Haberman E. Harrison T. Herrera C. Kenyon S. Keown T. H. King P. Kramer G. K. Kullberg D. G. Leonard G. Lind W. M. Lydecker R. E. Lynch J. E. Macko A. F. Marks R. G. Martin T. C. McAvinew J. M. McHenry T. J. Myron, Jr. J. Nevelus R. L. Nicholson H. C. Prenderg
16、ast W. A. Rock F. Sandt R. Shearer J. W. Stuckey w. su R. C. von Brecht S. W h ita ke r J. H. Young 4 COMPANY Stearns-Roger Engineering Corporation Johns-Manville Sales Corporation Ralph M. Parsons Company Dow Corning Corporation Bechtel Power Corporation Dow Chemical USA Toledo Edison Company Weyer
17、haeuser Company Foster Wheeler M. W. Kellogg Co. Gulf Science Instrumentation system diagrams; Specifications, purchase orders, manifests, and other lists; ISA-S5.3-1983 9 Construction drawings; Technical papers, literature, and discussions; Tagging of instruments; and Installation, operation, and m
18、aintenance instructions, drawings, and records. 2.2 Relationship to other ISA standards This standard complements ISA-S5.1, “Instrumentation Symbols and Identification,“ for symbols and formats representing functional identification codes. For clarification of examples, a limited amount of ISA-S5.1
19、symbology has been included in this document. 2.3 Relationship to other standards Where applicable, definitions not included in Section 3 are in accordance with ANSI X3/TR-1-77, “American National Dictionary for Information Processing,“ and/or ISA-S5.1. 3 Definitions and abbreviations Accessible-A s
20、ystem feature that is viewable by and interactive with the operator, and allows the operator to perform user-permissible control actions, e.g., set point changes, auto-manual transfers, or on-off actions. Assignable-A system feature that permits an operator to channel (or direct) a signal from one d
21、evice to another, without the need for changes in wiring, either by means of switches or via keyboard commands to the system. Communication link-The physical hardware required to interconnect devices for the purpose of transmitting and/or receiving data. Computer control system-A system in which all
22、 control action takes place within the control computer. Single or redundant computers may be used. Configurable-A system feature that permits selection through entry of keyboard commands of the basic structure and characteristics of a device or system, such as control algorithms, display formats, o
23、r input/output terminations. C.R.T.-Cathode Ray Tube Distributed control system-That class of instrumentation (input/output devices, control devices and operator interface devices) which in addition to executing the stated control functions also permits transmission of control, measurement, and oper
24、ating information to and from a single or a plurality of user-specifiable locations, connected by a communication link. 1/04 n put/Out pu t Shared controller-A control device that contains a plurality of pre-programmed algorithms which are user retrievable, configurable, and connectable, and allows
25、user defined control strategies or functions to be implemented. Control of multiple process variables can be implemented by sharing the capabilities of a single device of this kind. 10 ISA-S5.3-1983 Shared display-The operator interface device used to display signals and/or data on a time shared bas
26、is. The signals and/or data, .e., alphanumeric and/or graphic, reside in a data base from where selective accessibility for display is at the command of a user. Software-Digital programs, procedures, rules, and associated documentation required for the operation and/or maintenance of a digital syste
27、m. Software link-The interconnection of system components or functions via software or keyboard instruction. Supervisory set point control system-The generation of set point and/or other control information by a computer control system for use by shared control, shared display or other regulatory co
28、ntrol devices. 4 Symbols 4.1 General Standard instrumentation symbols as shown in ISA-S5.1 are retained as much as possible for flow diagram use, but are supplemented as necessary by the new symbols in Sections 4.2 through 4.6. Symbol size should be consistent with ISA-33.1, Section 3. The symbol de
29、scriptions listed to the right of each symbol are intended as guidelines for applications, and are not intended to be all inclusive. The symbol may be used if one or more of the descriptions apply. Shared signal lines can be expressed by the symbol for a system link (See Section 4.6.1 “8. 4.2 Distri
30、buted controVshared display symbols Advances in control systems brought about by microprocessor based instrumentation permit shared functions such as display, control and signal lines. Therefore, the symbology defined here should be “Shared Instruments,“ which means shared display and/or shared cont
31、rol. The square portion of this symbol, as shown in paragraphs 4.2.1 through 4.2.3 has the meaning of shared type instrument. 4.2.1 Normally accessible to operator Indicator/Controller/Recorder or Alarm Points-usually used to indicate video display. 1) Shared display. 2) Shared display and shared co
32、ntrol. 3) Access limited to communication link. 4) Operator Interface on communication link. 4.2.2 Auxiliary operators interface device 1) Panel mounted-normally having an analog faceplate-not normally mounted on main operator console. 2) Can be a backup controller or manual station. 3) Access may b
33、e limited to communication link. 4) Operator interface via the communication link. ISA-S5.3-1983 11 4.2.3 Not normally accessible to operator 1) Shared blind controller. 2) Shared display installed in field. 3) Computation, signal conditioning in shared controller 4) May be on communication link. 5)
34、 Normally blind operation. 6) May be altered by configuration 4.3 Computer symbols The following symbols should be used where systems include components identified as “computers,“ as distinct from an integral processor, which drive the various functions of a “distributed control system.“ The compute
35、r component may be integrated with the system via the data link, or it may be a stand-alone computer. 4.3.1 Normally accessible to operator Indicator/Controller/Recorder or Alarm Point- usually used to indicate video display. 4.3.2 Not normally accessible to operator O 1) Input/Output interface. 2)
36、Computation/Signal conditioning within a computer. 3) May be used as a blind controller or a software calculation module. 4.4 Logic and sequential control symbols 4.4.1 General symbol-For undefined complex interconnecting logic or sequence control. (Also see ISA-S5.1). O 4.4.2 Distributed control in
37、terconnecting logic controller with binary or sequential logic functions. 1) Packaged programmable logic controller, or digital logic controls integral to the distributed control equipment. 2) Not normally accessible by the operator. 12 ISA-S5.3-1983 4.4.3 Distributed control interconnecting logic c
38、ontroller with binary or sequential logic functions. 1) Packaged programmable logic controller, or digital logic controls integral to the distributed control equipment. 2) Normally accessible to the operator. 4.5 Internal system function symbols 4.5.1 Computation/Signal conditioning n U 4.6 Common s
39、ymbols 4.6.1 System link -0-o- 1) For block identification refer to ISA-33.1, Table 2 “Function Des i g n at o n s for Re I ays .II 2) For extensive computational requirements, use designation “ C. II Ex p I a i n o n su p p I e ment ar y d ocu m en t at i on . 3) Used in conjunction with function r
40、elay bubbles per ISA-S5.1. 1) Used to indicate either a software link or manufacturers system supplied connections between functions. 2) Alternatively, link can be implicitly shown by contiguous symbols. 3) May be used to indicate a communication link at the users option. 4.7 Recorders and other his
41、torical data retention 4.7.1 Conventional hard-wired recording devices such as strip chart recorders shall be shown in accordance with ISA-33.1. (Refer to Appendix A.2.2. of this standard.) 4.7.2 For assignable recording devices use Symbol 4.2.1. 4.7.3 Long term/mass storage of a process variable by
42、 digital memory means such as tape, disc, etc., shall be depicted in accordance with 4.2 or 4.3 of this standard, depending on the location of the device. 5 Identification For purposes of this standard, identification codes shall be consistent with ISA-33.1, with the following additions. 5.1 Softwar
43、e alarms Software alarms may be identified by placing ISA-S5.1, Table 1, letter designators on the input or output signal lines of the controls, or other specific integral system component. See Section 6 Alarms of this standard. ISA-S5.3-1983 13 5.2 Contiguity of symbols Two or more symbols can adjo
44、in to express the following means in addition to those shown in ISA-S5.1: 1) Communication among the associated instruments, e. g., Hard wiring Internal system link Backup Instrument integrated with multiple functions, e.g., Multipoint recorder Control valve with integrally mounted controller. 2) Th
45、e application of contiguous symbols is a user option. If the intent is not absolutely clear, contiguous symbols should not be used. 6 Alarms 6.1 General All hard-wired standard devices and alarms, as distinct from those devices and alarms specifically covered in this standard, shall be shown in acco
46、rdance with ISA-33.1, Table 1. The examples in paragraph 6.2 illustrate principles of the methods of symbolization and identification. Additional applications that adhere to these principles may be devised as required. The location of the alarm identifiers is left to the discretion and convenience o
47、f the user. 6.2 Instrument system alarms 6.2.1 Multiple alarm capability is provided in most systems. Alarms covered by this standard should be identified as shown by the examples in 6.2.2 and 6.2.3. 14 ISA-S5.3-1983 6.2.2 Alarms on measured variables shall include the variable identifiers, .e.: Pre
48、ssure: PA H PA L d P/dt P DA (High) (Low) (Rate of change) (Deviation from set point) PAH dP/dt PDA r- I Example 6.2.2 6.2.3 Alarms on controller output shall use the undefined variable identifier X, .e.: XAH XAL d/dt (High) (Low) (Rate of change) r- I 102 Example 6.2.3 ISA-S5.3-1983 15 Appendix A -
49、 Examples A.l Examples of use A.l .I The following figures illustrate some of the various combinations of symbols presented in this standard and ISA-S5.1. These symbols may be combined as necessary to fulfill the needs of the user. A.1.2 Controllers located in the diagram main information line are to be considered the primary controllers. All devices outside the main line provide a backup or secondary function. m 1 I - r- I A i Figure AI. Computer Control-No Backup - Shared Display r- I I I m - 1 8 1” * Figure A2. Computer Co
