Programmable Logic Controllers

Continuing the well-established tradition of its bestselling predecessors, this straight forward and easy-to-use book presents the principles of PLCs. With minimal jargon, clear explanation and simple examples, this is the book for students and professionals who need to understand and get up and running with PLCs in their studies or work. The book is not device specific, meaning it ensures maximum applicability to readers. Usability and understanding is aided by extensive examples and end-of-chapter problems that utilize several popular PLCs. This edition has been enhanced with new material on combinational and sequential logic, I/Os, protocols and networking.

Preface	p. ix
Programmable Logic Controllers	p. 1
Controllers	p. 1
Hardware	p. 4
Internal Architecture	p. 5
PLC Systems	p. 11
Summary	p. 16
Problems	p. 17
Input/Output Devices	p. 21
Input Devices	p. 21
Output Devices	p. 39
Examples of Applications	p. 49
Summary	p. 51
Problems	p. 53
Digital Systems	p. 59
The Binary System	p. 60
Octal and Hexadecimal	p. 60
Binary Coded Decimal	p. 62
Numbers in the Binary, Octal, Hex and BCD Systems	p. 63
Binary Arithmetic	p. 64
PLC Data	p. 67
Combinational Logic Systems	p. 68
Sequential Logic Systems	p. 69
Summary	p. 71
Problems	p. 73
I/O Processing	p. 75
Input/Output Units	p. 75
Signal Conditioning	p. 81
Remote Connections	p. 85
Networks	p. 95
Examples of Commercial Systems	p. 99
Processing Inputs	p. 102
I/O Addresses	p. 103
Summary	p. 104
Problems	p. 105
Ladder and Functional Block Programming	p. 111
Ladder Diagrams	p. 111
Logic Functions	p. 116
Latching	p. 123
Multiple Outputs	p. 123
Entering Programs	p. 125
Function Blocks	p. 126
Program Examples	p. 134
Summary	p. 137
Problems	p. 138
IL, SFC and ST Programming Methods	p. 147
Instruction Lists	p. 147
Sequential Function Charts	p. 156
Structured Text	p. 160
Summary	p. 168
Problems	p. 169
Internal Relays	p. 181
Internal Relays	p. 181
Ladder Programs	p. 182
Battery-Backed Relays	p. 186
One-Shot Operation	p. 187
Set and Reset	p. 188
Master Control Relay	p. 193
Summary	p. 198
Problems	p. 200
Jump and Call	p. 209
Jump	p. 209
Subroutines	p. 211
Summary	p. 215
Problems	p. 215
Timers	p. 219
Types of Timers	p. 219
On-Delay Timers	p. 220
Off-Delay Timers	p. 225
Pulse Timers	p. 226
Retentive Timers	p. 228
Programming Examples	p. 229
Summary	p. 230
Problems	p. 232
Counters	p. 239
Forms of Counter	p. 239
Programming	p. 239
Up- and Down-Counting	p. 245
Timers with Counters	p. 246
Sequencer	p. 251
Summary	p. 251
Problems	p. 252
Shift Registers	p. 261
Shift Registers	p. 261
Ladder Programs	p. 262
Summary	p. 266
Problems	p. 267
Data Handling	p. 273
Registers and Bits	p. 273
Data Handling	p. 274
Arithmetic Functions	p. 278
Closed Loop Control	p. 279
Summary	p. 283
Problems	p. 283
Designing Systems	p. 289
Program Development	p. 289
Safe Systems	p. 292
Commissioning	p. 298
Fault Finding	p. 300
System Documentation	p. 307
Summary	p. 329
Problems	p. 329
Programs	p. 333
Temperature Control	p. 333
Valve Sequencing	p. 339
Conveyor Belt Control	p. 349
Control of a Process	p. 356
Problems	p. 358
Appendix: Symbols	p. 363
Answers	p. 369
Index	p. 389
Table of Contents provided by Ingram. All Rights Reserved.

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