Programmable Logic Controllers, Sixth Edition

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

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

A programmable logic controllers (PLC) is a real-time system optimized for use in severe conditions such as high/low temperatures or an environment with excessive electrical noise. This control technology is designed to have multiple interfaces (I/Os) to connect and control multiple mechatronic devices such as sensors and actuators. Programmable Logic Controllers, Fifth Edition, continues to be a straight forward, easy-to-read book that presents the principles of PLCs while not tying itself to one vendor or another. Extensive examples and chapter ending problems utilize several popular PLCs currently on the market highlighting understanding of fundamentals that can be used no matter the specific technology. Ladder programming is highlighted throughout with detailed coverage of design characteristics, development of functional blocks, instruction lists, and structured text. Methods for fault diagnosis, testing and debugging are also discussed. This edition has been enhanced with new material on I/Os, logic, and protocols and networking Content: Front Matter, Pages i-ii Copyright, Page iv Preface, Pages ix-xii Chapter 1 - Programmable Logic Controllers, Pages 1-22 Chapter 2 - Input/Output Devices, Pages 23-61 Chapter 3 - Digital Systems, Pages 63-78 Chapter 4 - I/O Processing, Pages 79-113 Chapter 5 - Ladder and Functional Block Programming, Pages 115-150 Chapter 6 - IL, SFC, and ST Programming Methods, Pages 151-185 Chapter 7 - Internal Relays, Pages 187-214 Chapter 8 - Jump and Call, Pages 215-224 Chapter 9 - Timers, Pages 225-244 Chapter 10 - Counters, Pages 245-266 Chapter 11 - Shift Registers, Pages 267-277 Chapter 12 - Data Handling, Pages 279-293 Chapter 13 - Designing Systems, Pages 295-339 Chapter 14 - Programs, Pages 341-374 Appendix - Symbols, Pages 375-380 Answers, Pages 381-399 Index, Pages 401-412 Rapid technological advances have made the PLC (programmable logic controller) an important part of many industries, from petrochemicals to food production. This fourth edition provides students with an accessible introduction to the subject