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है”ह”ह

IS 12754-4 (1989): Industrial process measurement controlfunctions and instrumentation - Symbolic representation,Part 4: Basic symbols for process computer, interface andshared display/control functions [MED 17: ChemicalEngineering Plants and Related Equipment]

IS 12754 ( Part 4 ) : 1989 IS0 351 l/4 1985

Indian Standard INDUSTRIAL PROCESS MEASUREMENT CONTROL

FUNCTIONS AND INSTRUMENTATION - SYMBOLIC REPRESENTATION

PART 4 BASIC SYMBOLS FOR PROCESS COMPUTER, INTERFACE, AND

SHARED DISPLAY/CONTROL FUNCTIONS

‘4Teh wmi

UDC 621-5 : 003#62

@J BIS 1990

BUREAUOF INDIAN STANDARDS MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

February 1990 Price Group 5

IS 12764 ( Part 4 ) : 1999

IS0 361 l/4 : 1986

Indian Standard

INDUSTRIAL PROCESS MEASUREMENT CONTROL FUNCTIONS AND INSTRUMENTATION -

SYMBOLIC REPRESENTATION

PART 4 BASIC SYMBOLS-FOR PROCESS COMPUTER, INTERFACE, AND

SHARED DISPLAY/CONTROL FUNCTIONS

NATIONAL FOREWORD

This Indian Standard ( Part 4 ). which is identical with IS0 351 l/4 : 1985 *Industrial process measurement control functions and instrumentation - Symbolic representation - Part 4: Basic symbols for process computer, interface, and shared display/control functions’ issued by the International Organization for Standardization ( IS0 ) was adopted on 18 August 1989 by the Bureau of Indian Standards on the recommendation of the Chemical Engineering Sectional Committee ( HMO 17/EDC 57 ) and approval of the Heavy Mechanical Engineering Division Council.

Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard’.

This Indian Standard is in four parts as detailed out in the Introduction.

1

As in the Original Standard, this Page is Intentionally Left Blank

IS 12764 ( Part 4 ) : 1689 IS0 3611/4 : 1666.

0 Introduction 0

This International Standard has been devised to provide a universal means of communication between the various in- terests involved in the design, manufacture, installation and operation of measurement and control equipment used in the process industries.

Requirements within the industries vary considerably; in recognition of this, this International Standard is presented in four parts as follows:

Part 1: Basic requirements (directed towards the needs of those employing comparatively simple measurement and control means).

Part 2: Extension of basic requirements.

Part 3: Detailed symbols for instrument interconnection diagrams.

Part 4: Basic symbols for process computer, interface func- tions, and shared display/control functions.

They are intended to provide a means of illustrating process computer and/or shared display/control functions in the field of process measurement and control and may be used with the symbols of IS0 3511/ 1 and IS0 3511/2. They will enable users to show and identify in simple form the functions of instru- ments, the process computer, and shared display/control func- tions, or any combination of these.

It is permissible to use the basic symbol for computer-based functions (see 3.1) throughout for any software-based digital system. This is not intended to preclude the use of the basic symbol for shared display/control functions (see 3.2) if the user considers this to be appropriate.

The symbols are intentionally limited to identification on pro- cess flow diagrams, piping and instrument diagrams, etc. and do not provide means of illustrating specific instruments or parts thereof.

The letter code for function identification shall be taken from table 1 of IS0 3511/l and IS0 3511/2.

The application methods are shown in the examples.

These parts together are intended to 2 Definitions

a) meet the requirements of those who, possibly employ- ing more sophisticated measurement and control 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. These symbols are not intended to replace graphical symbols for electrical equipment as contained in IEC Publication 617, Graphical symbols for diagrams.

1 Scope and field of application

The symbols established in this part of IS0 3511 have been developed to be used in conjunction with the symbols given in IS0 3511/l and IS0 3511/2 and shall be considered as sup- plementary.

For the purposes of this part of IS0 3511, the following defini- tions and the definitions given in IS0 3511/ 1 and IS0 3511 i2 apply.

2.1 programmable: Term indicating the capability of the system to accept instructions in computer language given by the user for performing control strategies or complex functions.

2.2 configurable: Term indicating the capability of the system to allow the user to select, from pre-programmed func- tions (modular software units). those which are necessary to accomplish a control strategy or other complex functions, without the use of computer language.

2.3 process computer: Programmable device which operates in real time on process data, on-line (primarily sensor- based). to perform user specifiable supervision and/or control functions.

3

IS 12764 ( Part 4 ) : 1999 IS0 361114 : 1996

2.4 shared display/shared control system: System in which shared functions, such as display, control and com-

munications, are shared in time, i.e. “time-shared” functions.

These functions are generally accomplished by devices contain-

ing pre-programmed algorithms which are user accessible, con-

figurable and connectable to perform a given control strategy

or function.

2.5 distributed control system (DCS) : System for process control purposes which, while being functionally integrated,

consists of sub-systems which may be physically separated and

remotely located from one another. These sub-systems are nor- mally connected by a communication link (e.g. data bus).

2.6 software link: Interconnection of system functions via

keyboard or program instructions (soft wiring as opposed to

hard wiring).

- a letter code in accordance with IS0 3511 /l and

IS0 3511/2 denoting the process computer functions.

If required, a number may be included to make identification

easier.

If only computer functions are provided, the basic symbol alone

may be used [see figure 1 b)l.

The basic symbol is usually applied in conjunction with the

basic symbols of IS0 3511/l and IS0 3511/2 showing

measured process variables or actuated correcting unit [see

figure 1c)l.

3 Basic symbols

3.1 Basic symbol for computer-based functions

The symbol comprises

- a thin line hexagon of approximately 10 mm width be- tween two parallel sides [see figure lall;

0

a) Basic symbol

a--’

Symbols which touch each other imply communication be-

tween functions.

NOTES

1 An acceptable alternative symbol, used by some countries, is the thin line half-circle. Several examples &f this usage a!e shown for

reference in clause 4.

2 The single horizontal line (see IS0 351 l/l) should be used to in-

dicate the existence of operator interface in the control room.

3 The double horizontal line (see IS0 3511/2) should be used to in-

dicate accessibility at a local panel.

4 This symbol is intended to represent cbmputer and interface func-

tions performed by a programmable device.

bj Symbol for process computer only

c) Symbol in connection with

instruments

Figure 1

4

IS 12764 ( Part 4 ) : 1989 IS0 3511,‘4 : 1986

3.2 Basic symbol for shared display/control functions

The symbol comprises

The basic symbol is usually applied in conjunction with the

basic symbols of IS0 3511 /l and IS0 3511/Z showing

measured process variables or actuated correcting unit (see figure 2~91.

- a thin line circle of approximately 10 mm in diameter set

inside a square [see figure 2a)l;

Symbols which touch each other imply communication be- tween functions.

NOTES - a letter code in accordance with IS0 3511 /l and

IS0 3511/2 denoting the shared display/control functions.

If required, a number may be included to make identification

easier.

If only shared display/control functions are provided, the basic

symbol alone may be used [see figure 2b)l.

1 The basic symbol is not rotatable.

2 The single horizontal line (see IS0 3511/l) should be used to in- dicate the existence of operator interface.

3 The double horizontal line lsee IS0 3511/2) should be used to in- dicate accessibility at a local panel. *

4 This symbol is intended to represent functions performed by a con- figurable device with shared functions for display and/or control.

Kl

a) Basic symbol

Q 8

b) Symbol for shared c) Symbol in connection with

display/shared control only instruments

I

Figure 2

IS 12764 ( Part4 ) : 1999 IS0 3611/4 : 1986

4 Examples of use of the symbols

4.1 Process computer examples

4.1.1 Pressure signal to computer

P j-c. Alternative method

4.1.2 Temperature signal to computer (input number 2111 with temperature recording and high &arm by computer normally accessible to the operator

Alternative method

4.1.3 Flow recording and control by computer

4.1.4 Control valve actuated and position display (open-shut) on computer

Alternative method

6 i

IS 12754 ( Part 4 ) : 1989 - IS0 3511,‘4 : 1985 L

4.1.5 Flow recording and control by computer, flow indication in control room

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 room

*

- I

IS12764( Part4 ):1999

IS0 3511/4:1986

4.1.8 Cascade control and indication and recording of temperature by computer with “back-up” control and indication with common process connections 1”

Alternative method

/ / I I

8

__._.,___-_ *. .__ ,,.I _“_. I

18 12764 ( Part 4 ) : 1999 ISC) 361 l/4 : 1986

4.1.9 Indication and cascade control of. level to flow by computer, with connected “back-up” control and indication

4.2 Shared display/control examples

4.2.1 Flow recording on shared display

FR

L 4.2.2 Shared control and recording of pressure, i.e. by distributed control system (DCS) with pressure recording by a discrete instrument in control room

.

---. .._“.

.

IS12754( Pert4 ):1999

IS0 9511/4:1986

42.3 Cascade control examples

LEA-106 DCS control (master) and low alarm

LZA-107 “Hard-wired” protection system with its own alarm announcement, not duplicated in DCS

FRC-101 DCS recording control (slave of LICA-106)

TA-110 “Hard-wired” high temperature alarm with its own announcement and duplicated in DCS

HS-103 “Hard-wired” local manual reset

*

I

10

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