Process Control Systems Principles of design, operation and interfac
This book reflects the considerable current industrial interest and investment in process control systems. The use of computer systems in process control can provide great benefits, and it is estimated that efficiency can be increased by up to 30%. It is
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To my sons Drazen, Dinko, Alan and Ozren To the memory of the distinguished men and teachers Emerik Jovic and Zlatko Singer
Process Control
Systems
Principles of design, operation and interfacing SECOND EDITION
Fran Jovic Professor of Control Engineering, University of Zagreb; Section Manager Computer Systems and Intelligent Process Control Engineering, A TM Zagreb Company, Yugoslavia English Language Edition Consultant: R.M. Henry, School of Control Engineering, University of Bradford
Ignl
SPRINGER-SCIENCE+BUSINESS MEDIA, BV
First edition 1986 Second edition 1992 © 1986, 1992 Fran Jovic Originally published by Chapman & Hall in 1992 Softcover reprint of the hardcover 2nd edition 1992 Typeset in 1O/12pt Times by Graphicraft Typesetters Ltd., Hong Kong ISBN 978-94-010-5380-8 ISBN 978-94-011-3116-2 (eBook) DOl 10.1007/978-94-011-3116-2 Apart from any fair dealing for the purposes of research or private study, or criticism or review, as permitted under the UK Copyright Designs and Patents Act, 1988, this publication may not be reproduced, stored, or transmitted, in any form or by any means, without the prior permission in writing of the publishers, or in the case of reprographic reproduction only in accordance with the terms of the licences issued by the Copyright Licensing Agency in the UK, or in accordance with the tenns of licences issued by the appropriate Reproduction Rights Organization outside the UK. Enquiries concerning reproduction outside the terms stated here should be sent to the publishers at the London address printed on this page. The publisher makes no representation, express or implied, with regard to the accuracy of the information contained in this book and cannot accept any legal responsibility or liability for any errors or omissions that may be made. A catalogue record for this book is available from the British Library Library of Congress Cataloging-in-Publication data Jovic, Fran. Process control systems: principles of design operation and interfacing / Fran Jovic ; English language edition consultant, R.M. Henry. - 2nd ed. p. cm. Includes bibliographical references and indexes. 1. Process control-Data processing. I. Title. TS 156.8.J68 1991 660'.2815-dc20 91-26001 CIP
Contents
Preface
IX
Part One Systems, Processes and the Role of Process Control Hardware
1
1 Signals, systems and process control 1.1 1.2 1.3 1.4 1.5 2
3
Introduction A system approach to process control systems
Signals Systems The basic analytical concept of process control systems References
3 4 16
28
37 40
The basic process unit
41
2.1 2.2 2.3 2.4 2.5 2.6
41 41
Introduction The basic process unit Basic process unit data processing Process hardware for data input Process hardware for data output Auxiliary data for process control References
49 62 70 73 77
Stratification of control tasks and data communication
78
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8
78
Introduction Stratification of computer tasks Control levels and computer input/output hardware Characteristics of process control computer systems A
