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Preface . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Chapter 1 —
Introduction to PLCs
1.0 History of PLCs . . . . . . . . . . . . . . . . . . . 2
1.1 Why Use a PLC? . . . . . . . . . . . . . . . . . . .4
1.2 Traditional PLC Applications. . . . . . . . . 5
Chapter 2 —
The Micro PLC
2.0 Development of the Micro PLC . . . . . . 8
2.1 What Makes a Micro PLC a Micro? . . . 10
2.2 Capabilities Overview . . . . . . . . . . . . . 13
2.3 Micro PLC Applications . . . . . . . . . . . . 14
Chapter 3 —
Micro PLC Operation
3.0 Components Overview. . . . . . . . . . . . . 18
3.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Outputs . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3 Central Processing Unit – CPU . . . . . . 21
3.4 Types of Application Memory . . . . . . . 22
3.5 Data, Memory and Addressing. . . . . . . 23
3.6 Operating Cycle . . . . . . . . . . . . . . . . . . 24
3.7 Power Supplies . . . . . . . . . . . . . . . . . . 26
3.8 Programming Devices . . . . . . . . . . . . . 28
3.9 Operator Interfaces . . . . . . . . . . . . . . . 30
TABLE OF CONTENTS
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