Process Control Systems Principles of design and operation
Stratification of computer tasks 94 Example I 94 Example 2 96 Controllevels and computer input/output hardware 104 Leveli 105 Level 2 118 Level 3 118 Level4 118 Level5 119 Characteristics of process control computer systems 119 A survey of process control
- PDF / 35,226,212 Bytes
- 449 Pages / 439 x 666 pts Page_size
- 65 Downloads / 221 Views
PROCESS CONTROL SYSTEMS Principles of design and operation
FranJovic English Language Edition Consultant: R M Henry, School of Control Engineering, University of Bradford
Kogan Page
Acknowledgements The following tables and figures have been reproduced here with the kind permission of the Institute of ElectricaI and Electronic Engineers: Figures 3.2, 3.3 and 3.5, and Tables 3.1 and 3.2 Figure 6.9 © 1980; and Figure 6.16 © 1983.
© 1983;
To my sons Drazen, Dinko, Alan and Ozren To the memory of the distinguished men and teachers Emerik J ovic and Zlatko Singer
ISBN-13: 978-1-4684-8377-2 DOI: 10.1007/978-1-4684-8375-8
e-ISBN-13: 978-1-4684-8375-8
First published 1986 by Kogan Page Ltd 120 Pentonville Road, London NI 9JN Copyright © 1986 F Jovic
Softcover reprint of the hardcover 1st edition 1986
All rights reserved British Library CataIoguing in Publication Data Jovic, Fran Process control systems. 1. Process control-Data processing I. Title 670.42'7 TS156.8 ISBN-13: 978-1-4684-8377-2
Contents
Preface
9
Part I: Systems, Processes and the Role o[ Process Control Hardware
11
Chapter 1: Signals, systems and process control
13
Introduction 13 A system approach to process control systems 14 Introduction 14 The computer control system 15 Types of process 21 Signals 27 Introduction 27 Types of signal 28 Time-discrete signals 33 A description of signals 33 The information rate and conte nt of process signals 36 Communication of signals 38 Systems 39 Introduction 39 Transfer function of time-discrete systems 40 Time response of linear continuous systems 43 Classification of linear systems 45 Structuring of systems 47 Systems and automata 47 The basic analytical concept of process control systems 47 References 51
Chapter 2: The basic process unit Introduction 53 The basic process unit 53 Basic process unit data processing 61 Process hardware for data input 76 Measuring transducer 76 Sensor or detecting device 76 Signal converter 77 Standard process input devices 77 Process hardware for data output 84 Final control devices 84 Auxiliary data for process control 88 References 91
53
Chapter 3: Stratification of control tasks and data communication
93
Introduction 93 Stratification of computer tasks 94 Example I 94 Example 2 96 Controllevels and computer input/output hardware 104 Leveli 105 Level 2 118 Level 3 118 Level4 118 Level5 119 Characteristics of process control computer systems 119 A survey of process control computer hardware 120 Communication codes and circuits 138 Channe1 capacity 138 Types of connection and communication hardware 140 Practical suggestions and recommendations 152 Rcferences 153
Part II: The Role of Software in Process Control Systems
155
Chapter 4: The relative roles of software and hardware
157
In troduction 157 Data processing 158 Hardware 159 Computingpower 163 Software for process control data processing 169 Process software 170 Intercomputer communication software 173 Message switching software 173 Software for engineering ca1culations 173 Extcnded real-time software
