You are previewing Programmable Logic Controllers, 6th Edition.
O'Reilly logo
Programmable Logic Controllers, 6th Edition

Book Description

This textbook, now in its sixth edition, continues to be straightforward and easy-to-read, presenting the principles of PLCs while not tying itself to one manufacturer or another. Extensive examples and chapter ending problems utilize several popular PLCs, highlighting understanding of fundamentals that can be used regardless of manufacturer. This book will help you to understand the main design characteristics, internal architecture, and operating principles of PLCs, as well as Identify safety issues and methods for fault diagnosis, testing, and debugging.  New to This edition:

  • A new chapter 1 with a comparison of relay-controlled systems, microprocessor-controlled systems, and the programmable logic controller, a discussion of PLC hardware and architecture, examples from various PLC manufacturers, and coverage of security, the IEC programming standard, programming devices and manufacturer’s software
  • More detail of programming using Sequential Function Charts
  • Extended coverage of the sequencer
  • More Information on fault finding, including testing inputs and outputs with an illustration of how it is done with the PLC manufacturer’s software
  • New case studies


  • A methodical introduction, with many illustrations, describing how to program PLCs, no matter the manufacturer, and how to use internal relays, timers, counters, shift registers, sequencers, and data-handling facilities
  • Consideration of the standards given by IEC 1131-3 and the programming methods of ladder, functional block diagram, instruction list, structured text, and sequential function chart
  • Many worked examples, multiple-choice questions, and problems are included, with answers to all multiple-choice questions and problems given at the end of the book

Table of Contents

  1. Cover image
  2. Title page
  3. Table of Contents
  4. Copyright
  5. Preface
    1. Prerequisite Knowledge Assumed
    2. Changes from the Fifth Edition
    3. Structure of the Book
    4. Acknowledgments
  6. Chapter 1: Programmable Logic Controllers
    1. Abstract
    2. 1.1 Controllers
    3. 1.2 Hardware
    4. 1.3 PLC Architecture
    5. 1.4 PLC Systems
    6. 1.5 Programs
    7. Summary
    8. Problems
    9. Lookup Tasks
  7. Chapter 2: Input/Output Devices
    1. Abstract
    2. 2.1 Input Devices
    3. 2.2 Output Devices
    4. 2.3 Examples of Applications
    5. Summary
    6. Problems
    7. Lookup Tasks
  8. Chapter 3: Digital Systems
    1. Abstract
    2. 3.1 The Binary System
    3. 3.2 Octal and Hexadecimal
    4. 3.3 Binary Coded Decimals
    5. 3.4 Numbers in the Binary, Octal, Hex, and BCD Systems
    6. 3.5 Binary Arithmetic
    7. 3.6 PLC Data
    8. 3.7 Combinational Logic Systems
    9. 3.8 Sequential Logic Systems
    10. Summary
    11. Problems
    12. Lookup Tasks
  9. Chapter 4: I/O Processing
    1. Abstract
    2. 4.1 Input/Output Units
    3. 4.2 Signal Conditioning
    4. 4.3 Remote Connections
    5. 4.4 Networks
    6. 4.5 Examples of Commercial Systems
    7. 4.6 Processing Inputs
    8. 4.7 I/O Addresses
    9. Summary
    10. Problems
    11. Lookup Tasks
  10. Chapter 5: Ladder and Functional Block Programming
    1. Abstract
    2. 5.1 Ladder Diagrams
    3. 5.2 Logic Functions
    4. 5.3 Latching
    5. 5.4 Multiple Outputs
    6. 5.5 Entering Programs
    7. 5.6 Function Blocks
    8. 5.7 Program Examples
    9. Summary
    10. Problems
    11. Lookup Tasks
  11. Chapter 6: IL, SFC, and ST Programming Methods
    1. Abstract
    2. 6.1 Instruction Lists
    3. 6.2 Sequential Function Charts
    4. 6.3 Structured Text
    5. Summary
    6. Problems
  12. Chapter 7: Internal Relays
    1. Abstract
    2. 7.1 Internal Relays
    3. 7.2 Ladder Programs
    4. 7.3 Battery-Backed Relays
    5. 7.4 One-Shot Operation
    6. 7.5 Set and Reset
    7. 7.6 Master Control Relay
    8. Summary
    9. Problems
  13. Chapter 8: Jump and Call
    1. Abstract
    2. 8.1 Jump
    3. 8.2 Subroutines
    4. Summary
    5. Problems
    6. Lookup Tasks
  14. Chapter 9: Timers
    1. Abstract
    2. 9.1 Types of Timers
    3. 9.2 On-Delay Timers
    4. 9.3 Off-Delay Timers
    5. 9.4 Pulse Timers
    6. 9.5 Retentive Timers
    7. 9.6 Programming Examples
    8. Summary
    9. Problems
    10. Lookup Tasks
  15. Chapter 10: Counters
    1. Abstract
    2. 10.1 Forms of Counter
    3. 10.2 Programming
    4. 10.3 Up- and Down-Counting
    5. 10.4 Timers with Counters
    6. 10.5 Sequencer
    7. Summary
    8. Problems
    9. Lookup Tasks
  16. Chapter 11: Shift Registers
    1. Abstract
    2. 11.1 Shift Registers
    3. 11.2 Ladder Programs
    4. Summary
    5. Problems
    6. Lookup Tasks
  17. Chapter 12: Data Handling
    1. Abstract
    2. 12.1 Registers and Bits
    3. 12.2 Data Handling
    4. 12.3 Arithmetic Functions
    5. 12.4 Closed Loop Control
    6. Summary
    7. Problems
    8. Lookup Tasks
  18. Chapter 13: Designing Systems
    1. Abstract
    2. 13.1 Program Development
    3. 13.2 Safe Systems
    4. 13.3 Commissioning
    5. 13.4 Fault Finding
    6. 13.5 System Documentation
    7. Summary
    8. Problems
    9. Lookup Tasks
  19. Chapter 14: Programs
    1. Abstract
    2. 14.1 Temperature Control
    3. 14.2 Valve Sequencing
    4. 14.3 Conveyor Belt Control
    5. 14.4 Control of a Process
    6. 14.5 A Selection Example: A Drinks Machine
    7. 14.6 A Data Comparison Example: A Fan Heater
    8. Problems
    9. Lookup Tasks
  20. Appendix: Symbols
    1. Ladder Programs
    2. Function Blocks
    3. Logic Gates
    4. Sequential Function Charts
    5. Instruction List (IEC 61131-3 Symbols)
    6. Structured Text
  21. Answers
    1. Chapter 1
    2. Chapter 2
    3. Chapter 3
    4. Chapter 4
    5. Chapter 5
    6. Chapter 6
    7. Chapter 7
    8. Chapter 8
    9. Chapter 9
    10. Chapter 10
    11. Chapter 11
    12. Chapter 12
    13. Chapter 13
    14. Chapter 14
  22. Index