Technicians Guide to Programmable Controllers.pdf

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Programmable Controllers
6th Edition
Technician’s Guide to
Terry R. Borden
Richard A. Cox
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Technician’s Guide to Programmable
Controllers, Sixth Edition
Terry R. Borden, Richard A. Cox
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Library of Congress Control Number: 2011937980
ISBN-13:
978-1-111-54409-6
ISBN-10:
1-111-54409-3
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Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s).
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TABLE OF CONTENTS
Preface.........................................................................................................................................................x
Chapter 1
What is a Programmable Logic Controller (PLC)? ....................................................................................1
Chapter Summary ................................................................................................................................9
Review Questions ................................................................................................................................9
Chapter 2
Understanding the Input/Output (I/O) Section .........................................................................................10
I/O Section .........................................................................................................................................10
Fixed I/O ........................................................................................................................................11
Modular I/O ...................................................................................................................................12
Discrete I/O Modules .........................................................................................................................15
Discrete Input Module ..................................................................................................................15
AC Discrete Input Module.............................................................................................................16
DC Discrete Input Module.............................................................................................................20
Fast-Responding DC Input Modules .............................................................................................21
Discrete Output Modules ...............................................................................................................22
AC Output Module ........................................................................................................................23
Output Fuses ..................................................................................................................................25
Status Lights ..................................................................................................................................26
Module Keying ..............................................................................................................................27
DC Output Modules .......................................................................................................................28
Sourcing and Sinking .....................................................................................................................29
Contact Output Modules ................................................................................................................31
Interposing Relay ...........................................................................................................................31
Reed Relay Output Module ...........................................................................................................31
Transistor-Transistor Logic (TTL) I/O Modules ...........................................................................31
Analog I/O Modules ..........................................................................................................................32
Safety Circuit .....................................................................................................................................34
Rack Installation ................................................................................................................................35
Electrical Noise (Surge Suppression) ................................................................................................37
Grounding ..........................................................................................................................................39
I/O Shielding ......................................................................................................................................40
Chapter Summary ..............................................................................................................................41
Review Questions ..............................................................................................................................42
Chapter 3
Processor Unit ...........................................................................................................................................44
The Processor.....................................................................................................................................45
Memory Types ...................................................................................................................................49
Memory Size ......................................................................................................................................52
Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s).
Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.

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