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Programmable Controllers
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In memory of Arthur Parr, 1913–1992 .
Man is still the most extraordinary computer of all.
John F. Kennedy
21 May 1963
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Programmable Controllers
An engineer’s guide
Third edition
E.A. Parr, MSc, CEng, MIEE, MInstMC
Newnes
AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD
PARIS SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO
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Newnes
An imprint of Elsevier
Linacre House, Jordan Hill, Oxford OX2 8DP
200 Wheeler Road, Burlington, MA 01803
A division of Reed Educational and Professional Publishing Ltd
A member of the Reed Elsevier plc group
First published 1993
Second edition 1999
Third edition 2003
Copyright © E.A. Parr 1993, 1999, 2003. All rights reserved.
The right of E.A. Parr to be identified as the author of this work
has been asserted in accordance with the Copyright, Designs and
Patents Act 1988
No part of this publication
may be reproduced in any material form (including
photocopying or storing in any medium by electronic
means and whether or not transiently or incidentally
to some other use of this publication) without the
written permission of the copyright holder except
in accordance with the provisions of the Copyright,
Designs and Patents Act 1988 or under the terms of a
licence issued by the Copyright Licensing Agency Ltd,
90 Tottenham Court Road, London, England W1T 4LP.
Applications for the copyright holder’s written permission
to reproduce any part of this publication should be addressed
to the publishers
British Library Cataloguing in Publication Data
A catalogue record for this book is available
from the British Library
ISBN 0 7506 5757 X
For information on all Newnes publications visit our website at:
newnespress.com
Typeset by Integra Software Services Pvt. Ltd, Pondicherry, India
www.integra-india.com
Printed and bound in Great Britain
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Contents
Preface
xi
1 Computers and industrial control
1
1.1 Introduction
1
1.2 Types of control strategies
1
1.2.1 Monitoring subsystems
2
1.2.2 Sequencing subsystems
2
1.2.3 Closed loop control subsystems
4
1.2.4 Control devices
5
1.3 Enter the computer
6
1.3.1 Computer architectures
7
1.3.2 Machine code and assembly language programming
11
1.3.3 High level languages
11
1.3.4 Application programs
14
1.3.5 Requirements for industrial control
14
1.3.6 The programmable controller
18
1.4 Input/output connections
21
1.4.1 Input cards
21
1.4.2 Output connections
22
1.4.3 Input/output identification
28
1.5 Remote I/O
29
1.6 The advantages of PLC control
31
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