Technological advances in recent years have resulted in the development of the programmable logic controller (PLC) and a consequential revolution of control engineering. This book, an introduction to PLCs, aims to ease the tasks of practicing engineers coming into contact with PLCs for the first time. It also provides a basic course for students in curricula such as the English technicians’ courses for Nationals and Higher Nationals in Engineering, giving full syllabus coverage of the National and Higher National in Engineering units, company training programs, and serving as an introduction for first-year undergraduate courses in engineering.The book addresses the problem of various programmable control manufacturers using different nomenclature and program forms by describing the principles involved and illustrating them with examples from a range of manufacturers. The text includes:
- The basic architecture of PLCs and the characteristics of commonly used input andoutputs to such systems
- A discussion of the number systems: denary, binary, octal, hexadecimal, and BCD
- A painstaking methodical introduction, with many illustrations, describing how toprogram PLCs, whatever 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 ofladder, functional block diagram, instruction list, structured text, and sequential functionchart
- Many worked examples, multiple-choice questions, and problems to assist the readerin developing the skills necessary to write programs for programmable logiccontrollers, with answers to all multiple-choice questions and problems given at the end of the book
This book aims to enable the reader to:
- Identify and explain the main design characteristics, internal architecture, and operatingprinciples of programmable logic controllers.
- Describe and identify the characteristics of commonly used input and output devices.
- Explain the processing of inputs and outputs by PLCs.• Describe communication links involved with PLC systems, the protocols, and networkingmethods.
- Develop ladder programs for the logic functions AND, OR, NOR, NAND, NOT, andXOR.
- Develop ladder programs involving internal relays, timers, counters, shift registers,sequencers, and data handling.
- Develop functional block diagram, instruction list, structured text, and sequentialfunction chart programs.
- Identify safety issues with PLC systems.
- Identify methods used for fault diagnosis, testing, and debugging.
Ebook Contents
Chapter 1 – Programmable Logic Controllers
Chapter 2 – Input- Output Devices
Chapter 3 – Digital Systems
Chapter 4 – I/O Processing
Chapter 5 – Ladder and Functional Block Programming
Chapter 6 – IL, SFC, and ST Programming Methods
Chapter 7 – Internal Relays
Chapter 8 – Jump and Call
Chapter 9 – Timers
Chapter 10 – Counters
Chapter 11 – Shift Registers
Chapter 12 – Data Handling
Chapter 13 – Designing Systems
Chapter 14 – Programs
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