ISA-5.3

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Copyright The Instrumentation, Systems, and Automation Society Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS

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ISA-5.3-1983, ISA-5.3-1983, Graphic Symbols for Distributed Distributed ControVShared Display Display Instrumentation, Instrumentation, Logic and Computer Systems ISBN 0-87664-707-7 Copyright 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, stored 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. IS 67 Alexander Drive P.O. Box 12277 Research Triangle Triangle Park, North Carolina 27709

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Preface

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This preface is included for informational purposes and is not part of ISA-5.3-1983. This Stand ard has been prepared as a pa rt of the service of ISA toward a goal of uniformity in the field of instrume ntation. To be of real value, this docume nt shou ld not be static but shou ld be subject to periodic review. Towards this end, the S ociety welcomes all commen ts and criticisms and asks that they b e addressed to the S ecretary, Standards and Practices B oard, ISA, 67 Alexan der D rive, P O. Box 12277, Re search Triangle Park, No rth Carolina 2770 9, telephon e 9 1 9549-841 1, e-mail: stand ards8 isa.org. The ISA Standards and Practices D epartmen t is aware of the growing ne ed for attention to the metric system of u nits in general, and the International System of Units (SI) in particular, in the preparation of instrumen tation standards. Th e De partm ent is further aw are of the ben efits to USA users of ISA Standards of incorporating suitable references to the SI (and the metric system ) in their bus iness and profes sional dealings with other countries. Towards this end this Depa rtment will endeavor to introduce SI and SI-acceptable m etric units in all new and revised standards to the greatest extent possible. The Metric Practice Guide, which has been pub lished by the Am erican So ciety for Testing and Materials as A NSI designation 2 21 0.1 (ASTM E380 -76. IEEE Std. 268-1975), and future revisions, will be the reference guide for definitions, symb ols, abbreviations, and conversion factors. The systems referenced in this Standa rd are based on ad vances in control systems technology since the publication of ISA-33.1, "Instrumentation Symbols and Identification." During recent years, technology h as evolved in terms of m icroprocessor-based systems presentl manufactured by man y companies a s "Distributed Con trol Systems." These systems may include components identified as "comp uters" as distinct from the integral processor, which derives the various functions of the system. The com puter component may be integrated into the overall system, via the com munication link, or it may be a stand-alone computer. In attempting to implement these system s, the need for supplem entary symbolism has becom apparent. The sym bols defined in ISA-S5.3 are intended to com plemen t those of ISA-S5.1, "Instrumentation S ym bols and Identification," for use on flow diagram s. In this way, the integration of distributed controllers and process computers into the more traditional instrument systems nalog, b inary, and d igital an be de picted clearly on flow diagrams and other documents to give an ove rall and comprehensive picture of how process variables are m easured and controlled. Distributed control systems appear to be similar to each other; howe ver, they are so diverse in philosophy that there m ust be a generic way to document their application. The second printing of ISA -33.3, dated April 1 983, was published to correct errors in the original 1982 edition. The definition for communication link, Section 3, has bee n corrected and an omitted abbreviation, C.R.T., added . Minor clarifications were also mad e to the Appen dix A artwork. The ISA Standards Comm ittee on G raphic Symbols for Distributed ControVShared Display Instrumentation, Logic, and Computer Systems, SP5.3, operates within the ISA Standards and Practices De partment, Dr. Thom as J. Harrison, Vice President. The persons listed below served as mem bers of the SP 5.3 Comm ittee. ISA-S5.3-1983


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NAME

COMPANY

D. E. Rapley, Cha irman A. B ohnenberger, Secretary (deceased) R. Barber V. Barta G. Bennett J. Biggs V. Bins M. A. Blaschke C. T. Carr oll W. Cohen W. M . Dillow R. E. Dragoo S. E. Gaertner L. K. Haberman E. Harrison T. Herrera C. Kenyon S. Keown 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 C. McAvinew J. M. McHenry J. M yron, Jr J. Nevelus L. Nicholson H. C. Prendergast W. A. Rock F. Sandt R. Shearer J. W. Stuckey

Stearns-Roger Enginee ring Corporation Johns-Ma nville Sales Corporation Ralph M. Parsons Company Dow Corning Corporation Bechtel Power Corporation Dow Chemical USA Toledo E dison Com pany Weyerhaeuser Company Foster Wheeler M. W. Kellogg Co. Gulf Science Technology Honeywe ll, Inc

w.

R. C. von Brecht S. W h take J. H . Young


Bailey Me ter Company Exxon Coal USA Stone Web ster Engineering Corporation Amoco Oil Diamond Shamrock Corp. Ralph M. Parsons Company Ralph M. Parsons Company Dow Corning Corporation Aramco Services Sybro n Taylor Carnation Co Bec h el Pet ole um Westinghouse Be h el Pet ole um A. E. Staley Manufacturing International Coal Refining Co. Brown Root Foxboro Comp any Bechtel Power Corporation Sohio Coors Container Co. International Engineering Pennsylvania Power Light Stone &We bste r Engineering Cor Georgia Pacific Corporation Stearns-Roger En gineering Corporation M. W. Kellogg Co. Tex-A-Mation Bechtel Power Corporation

ISA-S5.3-1983 Licensee=KVAERNER E & C - AUSTRALIA/9980707001


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This Standard was approved for publication by the ISA Standards and Practices Board in June 1982.

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NAME

COMPANY

T. J. Harrison, Chairman

IBM Corporation Consultant The Foxboro Company Continental Oil Co. Bailey Controls Co. Philadelphia Electric Co. Boeing Company Isis Corp. Honeywell, Inc. Diamond Shamrock Corp. EG&G Idaho, Inc. ERDCO Engineering Corp. Bechtel Power Corp. Moore Products Company Gilbert A ssociates Allied C hemical Corp. Stearns-Roger, Inc.

W. Calder N. Conger B. Feikle R. T. Jone R. Keller O. . Lo ve tt, Jr. E. C. Magison A. P. McCauley J. W. Mock E. M. Nesvig G. Platt R. Prescott W. C. Weidman K. A. Whitman J. R. Williams B. A. Ch ristensen* L. N. Com bs* R. L. Galley* R. G. Marvin* W. B. Miller* R. L. Nickens*

Moore Products Company

*Director Emeritus ISA-S5.3-1983


5 Licensee=KVAERNER E & C - AUSTRALIA/9980707001


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Contents

.............................................................................................................................. Scape .................................................................................................................................

1 Purpose

2.1 Application to work activities .................................................................................... 2.2 Relationship to other IS

standards ......................................................................

2.3 Relationship to other standards .............................................................................

........................................................................................ ...........................................................................................................................

3 Definitisns and abbreviations 4 Symbols

4.1 General .................................................................................................................. 4.2 Distributed control/shared display symbols ........................................................... 4.3 Computer symbols ................................................................................................. 4.4 Lo gic and seqiiiential control syiwbols .................................................................... 4.5 Iriiternal systenii function sym ibol

..........................................................................

4. Cornmon syrnbols .................................................................................................. 4.7 Recorders an other historical data retention ........................................................ Identification

....................................................................................................................

5.1 Software alarms ..................................................................................................... 5.2 Contigarity of symbols ............................................................................................ Alarms

..............................................................................................................................

6.1 General .................................................................................................................. 6.2 Instrurnent system alarms .....................................................................................

A

~

pxamples~........................................................................................ ~ ~ ~ ~

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ISA-S5.3-1983




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Purpose

The purpose of this standard is to establish docume ntation for that class of instrumen tation consisting of computers, programm able controllers, minicomp uters and micro-processor based system s that have sha red control, shared display or other interface features. Sym bols are provided for interfacing field instrumentation, control room instrumentation and other hardw are to the above. Terminology is defined in the broades t generic form to describe the various categories of these devices. It is not the intent of this standard to m andate the us e of eac h type symb ol for eac h occu rrence of a gene ric device within the overall control system. Such usage could result in undue complexity in the cas e of a Piping and Instrument Drawing (P&ID). If, for example, a com puter compo nent is an integral part of a d istributed control system, the use of the com puter symb ol would normally be an undesirable redundancy. If, however, a sepa rate general purpose com puter is interfaced with the system, the inclusion of the com puter symbo l may provide the degree of clarity ne eded for control system u nderstanding. This standa rd attempts to provide the users with defined symbolism and rules for usage, which may be ap plied as nee ded to provide su fficient clarity of intent. Th e extent to w hich these symb ols are applied to various types of drawings remains with the u sers. The symb ols may be as simple or complex as need ed to define the process.

Scope

This s tandard satisfies the requiremen ts for symb olically representing the func tions of distributed ControVshared display instrumen tation, logic, and co mpu ter systems. Th e instrumentation is generally co mpo sed of field ha rdware comm unication networks and con trol room operator devices. This standard is applicable to all industries using p rocess control and instrumentation systems. effort will be m ade on the flow diagram to explain the internal construction, configuration, or metho d of operation of this type of instrumentation, logic and com puter systems. Personnel needing to und erstand flow diagrams must have a basic unde rstanding of the total system in order to correctly interpret the diagram. The type of compu tation or the use of the p rocess variable w ithin a program is not indicated except in those case s where the process variable is a integral part of the co ntrol strategy. In applications where all instrument system data base information is available to the co mpu ter via the com mun ication link, the depiction of the com puter interconnections is optional in order to co nserve s pace on flow diagrams. 2.

Application to work activities

This standard is intended for use whenever any reference to an instrument is required. Such references m ay be required for the following use s as well as o thers: Flow diagram s, process and m echan ical; Instrumentation system diagrams; Specifications, purchase orders, m anifests, and other lists; --````,,,`,,,,,````,``,`,,,,,``-`-`,,`,,`,`,,`---

ISA-S5.3-1983




9

Construction drawings; Technical papers, literature, and discussions; Tagging of instruments; and Installation, operation, and maintenance instructions, drawings, and records. 2.2

Relationship to other IS

standards

This standard co mplements ISA-S5.1, "Instrumen tation Symbols and Identification," for symbols and formats represe nting functional iden tification codes. For clarification of examp les, a limited amount of ISA-S5.1 symbology has been included in this d ocument. 2.

Relationship to other standard

Where applicable, definitions no t included in Section 3 are in accordance with AN SI X3/TR-1-77, "Ame rican National Dictionary for Information Processing," and/or ISA-S5.1.

Definitions and abbreviations

Acc essible -A system feature that is viewable by and interactive with the operator, and allows the ope rator to perform user-permissible co ntrol actions, e.g., set point changes, auto-m anual transfers, or on-off actions. Ass ignab le-A system feature that permits an operator to chann el (or direct) a signal from one device to another, without the ne ed for changes in wiring, either by m eans of switches or via keyboard comm ands to the system. Co un ica tio n link-The physical hardware required to interconnect devices for the purpose of transmitting an d/or receiving data. Co pu ter co nt ro l system-A system in which all control action takes place within the control computer. Single or redundant computers may be used. Con figurable-A system feature that permits selection through entry of keyboard comm ands o the basic structure and characteristics of a device or system, such as control algorithms, display formats, or input/output terminations. C.R.T.-Cathode

Ray Tube

ist rib ut ed tr l system-Th at class of instrumentation (input/output devices, control devices and o perator interface devices) which in addition to executing the stated co ntrol functions also permits transmission of control, measurement, and operating information to and from a single or a plurality of use r-specifiable locations, con nec ted by a commu nication link. 1/04 n put/Out pu

Sh are d controller-A

control device that contains a plurality of pre-programm ed algorithms

strategies or functions to be imp lemented . Con trol of multiple process variables can be implem ented by sharing the capabilities of a single dev ice of this kind.

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ISA-S5.3-1983

Sh are d display-Th e operator interface device used to display signals and/or data on a time shared b asis. The sign als and/or data, ¡.e., alphanu meric and/or graphic, reside in a data bas from w here selective accessibility for display is at the com man d of a user. Software-Digital program s, procedures , rules, and associated documen tation required for the operation and/or m aintenance of a digital system. So ftw are link-The instruction.

interconnection of system compone nts or functions via software or keybo ard

Su pe rvis ory se t poi nt co ntr ol system-The generation of set point and/or other control information by a co mpu ter control system for u se by shared con trol, shared display or othe regulatory control dev ices.

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Symbols

General

4.

Standard instrumen tation symb ols as shown in ISA-S5.1 are retained as m uch as po ssible for flow diagram use, but are supplemented as neces sary by the new sym bols in Sections 4.2 through 4.6. Sym bol size shou ld be consistent with ISA -33 .1, Section 3. The sym bol descriptions listed to the right of ea ch sym bol are intende d as guidelines for applications, and are no t intended to be all inclusive. The sym bol may be used if one or mo re of the des criptions apply. Shared signal lines can be ex pressed by the symb ol for a sys tem link (See Section 4.6.1 4.2

Distributed co ntroVshared display symbols

Adva nces in control systems b rought about by microproces sor based instrum entation permit shared functions such as display, control and signal lines. Therefore, the sym bology defined here should be "Sh ared Instruments," which m eans shared display and/or shared control. The s quare portion of this symbol, as show n in paragraphs 4.2.1 through 4.2.3 has the m eaning of shared type instrument. 1 No rma lly acc ess ible to operator Indicator/Controller/Recorder or Alarm Points-usually

use d to indicate video display.

1) Shared display.

2) Shared display and shared control. 3) Acces s limited to comm unication link. 4) Ope rator Interface on commu nication link. 2 Au xiliary operato r's interface dev ice 1) Panel mounted-normally

hav ing an ana log faceplate-not normally m ounted on main operator console.

2) Ca n be a backup controller or ma nua l station. 3) Acces s may be limited to comm unication link. 4) Ope rator interface via the comm unication link.

ISA-S5.3-1983




11

4.2.3 Not normally accessible to operator

1) Shared blind controller. 2) Sha red display ins talled in field. 3) Comp utation, signa l conditioning in shared controller 4) May be on com munication link.

5) Normally blind operation.

6) May be altered by configuration 4.

Computer symbols

The following symbols should be used where systems include componen ts identified as "computers," as distinct from an integral processor, which drive the various functions of a "distributed control system." The compu ter componen t m ay be integrated with the sys tem 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-

usua lly used to indicate video display.

4.3.2 Not normally accessible to operator

1) Input/Output interface. 2) Comp utation/Signal conditioning within a com puter. 3) May be used as a blind controller or a software ca lculation

module.

4.

Logic and sequen tial control symbols

4.4.1 Ge nera l symbol-For see ISA-S5.1)

undefined complex interconnecting logic or sequence control. (Also

4.4.2 Distributed control interconn ecting log ic controller with binary or seque ntial logic functions.

1) Pack aged programm able logic controller, or digital logic controls integral to the distributed control equipment. 2) Not normally accessible b y the operator.

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ISA-S5.3-1983

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4.4.3

Distributed control interconn ecting log ic controller with binary or seque ntial logic functions. 1) Pack aged programm able logic controller, or digital logic controls integral to the distributed control equ ipmen t. 2) Norm ally acces sible to the operator.

Internal system function symbols

4.

Compu tation/Signal conditioning

4.5.1

1) For block identification refer to IS A-3 3.1 , Table 2 "Fun ction Des g at o for Re ays II

2) For extensive com putational requiremen ts, use designation pa n su pp e mentar ocu men at on 3) Used in conjunction with function relay bubbles per ISA-S5.1.

Common symbol

4.

System link

4.6.1

-0-o-

1) Used to indicate either a software link or ma nufacturer's system sup plied connections between functions. 2) Alternatively, link can b e implicitly sho wn by contiguous symbols. 3) May be used to indicate a comm unication link at the u ser's option.

4.7

Recorders a nd other historical data retention

Conventional hard-wired recording devices such as strip chart recorders shall be shown in accordance with ISA-33.1. (Refer to Appen dix A.2.2. of this standard.)

4.7.1

4.7.2

For assignable recording de vices use S ymb ol 4.2.1.

Long term/mass storage of a process variable by digital m emo ry mean s such as tape, disc, etc., sha ll be depicted in accordanc e with 4.2 or 4.3 of this standard, d epen ding on the location of the device. 4.7.3

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Identification

For purposes of this standard, identification codes shall be consistent with ISA-33.1, with the following additions. 5.1

Software alarms

Software alarm s may be identified by placing ISA -S5.1, Table 1, letter designators on the inp ut or output signal lines of the controls, or other specific integral sys tem comp onen t. See Section Alarms of this standa rd.

ISA-S5.3-1983




13

Two or more symbols c an ad join to express the following m eans in addition to those show n in ISA-S5.1: 1)

Comm unication among the associated instruments, e. g., Hard wiring Internal system link Backup

2)

Instrum ent integrated with multiple functions, e.g., Multipoint recorder Control valve with integrally mounted controller.

The application of contiguous symbols is a user option. If the inten t is not abso lutely clear, con tiguou s symbo ls shou ld no be used.

Alarms

6.1 General All hard-wired standard devices and alarms, as distinct from those devices and a larms specifically co vered in this standard, shall be shown in accordance with ISA-3 3.1, Table 1 The examples in paragraph 6.2 illustrate principles of the methods of symbolization and identification. Add itional applications that adhere to these principles may be devised as required. The location of the alarm identifiers is left to the discretion and convenience of the user.

6.2 Instrument system alarms Multiple alarm capability is provided in most systems. Alarms co vered by this standard should b e identified as shown by the examples in 6.2.2 and 6.2.3. 6.2.1

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ISA-S5.3-1983

6.2.2 Alarms on measured variables shall include the variable identifiers, ¡.e.:

Pressure:

PA PA P/dt P DA

(High) (Low) (Rate of change) (Deviation from se t point)

PAH

r--------

dP/dt PDA

Example 6.2.2

6.2.3 Alarm s on controller output shall use the un defined variable identifier X, ¡.e.

d/dt

(High) (Low) (Rate of chang e)

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xample 6.2.3

ISA-S5.3-1983




15

Appendix A

Examples of

xamples

se

The following figures illustrate some of the various com binations of symbols p resented in this standard and ISA-S5.1. The se symbo ls may be combined as n ecessa ry to fulfill the n eeds of the user. .I

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 seco ndary function.

r-----

-----

r---

Figure

. Computer Control-No

Backup Shared Display

Figure A2. Computer Control-With

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’-

Analog Backup

Figure A3. Computer Control-Full Analog Backup Through Set Point Tracking (SPT)

16Systems, and Automation Society Copyright The Instrumentation, Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS

*Usage oí suffix (KI optional. Figure A4. Computer Control-Full Backup from Distribute Control Instrumentation. Computer Uses Instri ment System Communication Link



ISA-S5.3-1983

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r----

-1

Figure A5. Shar ed Display/Shared Control-No

Backup

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Ei---

Figure A6. Sha red Display/Shared Control-With Operator’s Interface Device

Auxilia

r--04

Figure A7. Analog Control-Interfaced with Shared Display. Shar ed Control Backup

_07

Figure AQ. Analog ControC-Blind Controller. Shared Display

ISA-S5.3-1983


Figure A8. Share d Displa y/Sha red Control-With Controller Backup

Analo

‘---Fi 08

Figure lo . Blind Sha red Control-With Interface Backup



Auxiliary Operator!

17

r-----

Figure

-----

1. Supervisory Set Point Control-Analog

Controller with Conventional Faceplate. Computer Supervisory Set Po int via Communicati on Link

r----

Figure

*User identification is optional

-F:---

5p

.P.

Figure

Supervisory Set Point Control-Analog

Con-

troller Complete with Conventional Faceplate. Computer Supervisory Set Point Hardwired.

-.P

--

3. Supervisory Set Point Control-Shared Display Shared Control with Fu ll Computer Access via the Communication Link

.2 Typical Flow Diagram com bines the basic symbols of this standard in a simplified drawing. It is intended A.2.1 Figure to provide a hypothetical example and to stimulate the user's imagination in the application symbolism to this equipment. Figure A.14 is arranged in the following manner: Volumetric fuel and air flows provide inputs for combustion system firing rate and fuel air ratio via distributed control instrum entation. Set points for both rate and ratio can be computer generated. Combustion air and gas pressures are m onitored by pressure switches which control the gas safety shutoff valve via U C-600 "distributed control interconnecting logic. Ma terial moisture content is measu red, dry weight of the input m aterial is calculated, and feed rate is controlled by MT -300 and WC -301. Discharged material moisture content is read by MT-302. At this point, firing rate an d/orfee d rate could be controlled by the Distributed Control System (DCS) instrumentation or by the computer taking other process variables into consideration.

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18


ISA-S5.3-1983 Licensee=KVAERNER E & C - AUSTRALIA/9980707001


4)

British therm al u nit (Btu) analysis (AT-97) is input to the co mpu ter syste m to gen erate feed forward control adjusting firing rate, in Btu/hr. The set point is calculated by the computer, based on feed rate, weight, and moisture content Interna l syste m links are shown for selected com puter input/output, while the firing rate and ratio set points are implied. Shown in the same manner, the links between the calculation modules an d the controllers are implied by con tiguous symbols, while the wild flow to the ratio control is shown in the s ystem link symbol. ` , , ` , ` , , ` , , ` ` ` ` , , , , , ` , ` ` , ` ` ` ` , , , , , ` , , , ` ` ` ` -

-

--_-___97

Figure A.14

ISA-S5.3-1983


xample

97

implified drawing



19

com bines the sym bols to depict a cascad e loop with alarms. Notes are added A.2.2 Figure on the diagram itself for clarification purpo ses only.

LEVEL TRANSMITTER COMPLEX INTERCONNECTING LOGIC

ALARM WARNING ON MEASURED VARIABLE

INSTRUMENT YSTEM

xxx

LINK

LOGIC DETAIL REFERENCE

PID ALGORITHM PERFORMED BY INSTRUMENT SYSTEM SEE NOTE 1

INPUT CONDITIONING (Sa RT. FUNCTION)

------ - - - HARD-WIRE

HARD-WIRE STRIP CHART RECORDER SEE NOTE

Notes: Share Display 1. Display/adjustments on console. Communication via data link. in console. 2. data selected Field mounted.

Figure A.15

20


ypical flow diagram-cascade

control loop



ISA-S5.3-1983

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D e v e l o p in g a n d p r o m u l g a t in g t e c h n i c a l ly s o u n d c o n s e n s u s s t a n d a rd s , r e c o m m e n d e d p r a c ti c e s, a n d t e c h n i c a l r e p o r t s i s o n e o f I S A ' s p r i m a r y goals. To achieve this goal the Standards and Practices Department r e l ie s o n t h e t e c h n i c a l e x p e r t i s e a n d e f f o r t s o f v o l u n t e e r c o m m i t te e m e m b e r s , c h a ir m e n , a n d r e v i e w e r s .

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I S A i s a n A m e r i c a n N a t i o n a l S t a n d a r d s I n s t i t u t e (A N S I ) a c c r e d i t e d o r g a n i z a t io n . I S A a d m i n i s t e r s U n i t e d S ta t e s T e c h n i c a l A d v i s o r y G r o u p s ( U ST A G s) a n d p r o v i d e s s e c r e ta r ia t s u p p o r t f o r I n t e rn a t i o n a l E l e c t r o t e c h n i c a l C o m m i s s i o n E C ) a n d I n t e r n a t i o n a l O r g a n i z a t io n f o r S t a n d a r d i z a t i o n (ISO) c o m m i tt e e s t h a t d e v e l o p p r o c e s s m e a s u r e m e n t a n d c o n t r o l s t a n d a r d s . T o o b t a i n a d d i t i o n a l in f o r m a t i o n o n t h e S o c i e t y ' s s t a n d a r d s p r o g r a m , p l e a s e w r it e :

Attn: Standards Department 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709

ISBN:




0-87664-707-7

ISA-5.3

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