Technician's Guide to Programmable Controllers

by Richard Cox

• ISBN13: 9780827362383
• ISBN10: 0827362382
• Edition: 3rd
• Format: Paperback
• Copyright: 1995-02-15
• Publisher: CENGAGE Delmar Learning

Summary

This revised bestseller covers all the concepts of operation common to all programmable controllers, offering the latest information on how controllers work and their applications to industry. Plus, readers will find step-by-step examples of basic programming, reinforced with numerous illustrations and photos throughout.

Table of Contents

Preface	p. xi
What is a Programmable Logic Controller (PLC)?	p. 1
Chapter Summary	p. 10
Review Questions	p. 10
Understanding the Input/Output (I/O) Section	p. 11
I/O Section	p. 11
Fixed I/O	p. 12
Modular I/O	p. 14
Discrete I/O Modules	p. 16
Discrete Input Module	p. 16
AC Discrete Input Module	p. 17
DC Discrete Input Module	p. 21
Fast-Responding DC Input Modules	p. 22
Discrete Output Modules	p. 23
AC Output Module	p. 24
Output Fuses	p. 26
Status Lights	p. 27
Module Keying	p. 28
DC Output Modules	p. 29
Sourcing and Sinking	p. 30
Contact Output Modules	p. 32
Interposing Relay	p. 32
Reed Relay Output Module	p. 33
Transistor-Transistor Logic (TTL) I/O Modules	p. 33
Analog I/O Modules	p. 33
Safety Circuit	p. 35
Rack Installation	p. 36
Electrical Noise (Surge Suppression)	p. 38
Grounding	p. 40
I/O Shielding	p. 41
Chapter Summary	p. 43
Review Questions	p. 44
Processor Unit	p. 46
The Processor	p. 47
Memory Types	p. 52
Memory Size	p. 54
Guarding Against Electrostatic Discharge (ESD)	p. 55
Memory Structure	p. 57
Peripherals	p. 57
Chapter Summary	p. 59
Review Questions	p. 60
Programming Devices (Programmers)	p. 61
Programming Devices	p. 61
Dedicated Desktop Programmers	p. 62
Hand-held Programmers	p. 65
Computer Programmers	p. 66
Dedicated Desktop Programmers (Advantages and Disadvantages)	p. 70
Hand-held Programmers (Advantages and Disadvantages)	p. 70
Personal Computer Programmers (Advantages and Disadvantages)	p. 70
Chapter Summary	p. 71
Review Questions	p. 71
Memory Organization	p. 72
Memory Words and Word Locations	p. 72
SLC 500 and MicroLogix 1000 and 1500 Addressing Scheme	p. 78
Modicon 984 Addressing Scheme	p. 86
Memory Organization	p. 87
Storage Memory	p. 87
User Memory	p. 90
Allen-Bradley PLC-5 File Structure	p. 90
SLC 500 and MicroLogix File Structure	p. 92
Chapter Summary	p. 98
Review Questions	p. 98
Numbering Systems	p. 99
Decimal System	p. 99
Binary System	p. 101
2s Compliment	p. 103
Octal System	p. 112
Hexadecimal System	p. 114
Binary Coded Decimal (BCD) System	p. 117
Using Numbering Systems	p. 118
Chapter Summary	p. 120
Review Questions	p. 121
Understanding and Using Ladder Diagrams	p. 123
Wiring Diagrams	p. 123
Ladder Diagrams	p. 124
Ladder Diagram Rules	p. 125
Basic STOP/START Circuit	p. 127
Sequenced Motor Starting	p. 129
Digital Logic Gates	p. 130
Chapter Summary	p. 138
Review Questions	p. 138
Relay Type Instructions	p. 141
Programming Contacts	p. 142
Examine on	p. 145
Examine off	p. 146
Clarifying Examine on and Examine off	p. 151
Chapter Summary	p. 155
Review Questions	p. 156
Programming a PLC	p. 157
Programming with a Computer	p. 159
Programming using Mnemonic Strings	p. 178
Peripherals	p. 182
Chapter Summary	p. 183
Review Questions	p. 183
Programming Considerations	p. 184
Network Limitations	p. 184
Programming Restrictions	p. 187
Program Scanning	p. 190
Programming Stop Buttons	p. 194
Logical Holding Instructions	p. 195
Discrete Holding Contacts	p. 195
Overload Contacts	p. 195
Chapter Summary	p. 197
Review Questions	p. 197
Program Control Instructions	p. 199
Master Control Relay Instructions	p. 199
Allen-Bradley PLC-5, SLC 500, and MicroLogix Master Control Reset (MCR) Instruction	p. 200
Latching Relay Instructions	p. 201
Safety Circuit	p. 204
Immediate Input Instruction	p. 205
Immediate Output Instruction	p. 206
Jump and Label Instructions	p. 207
Jump to Subroutine, Subroutine, and Return Instructions	p. 208
Temporary End Instruction	p. 208
Always False Instruction	p. 209
One Shot Instruction	p. 209
Chapter Summary	p. 210
Review Questions	p. 210
Programming Timers	p. 212
Pneumatic Timers (General)	p. 212
Allen Bradley PLC-5, SLC 500, and MicroLogix Timers	p. 218
Modicon Inc. Timers	p. 224
Cascading Timers	p. 227
Chapter Summary	p. 228
Review Questions	p. 228
Programming Counters	p. 230
Allen-Bradley PLC-5, SLC 500, and MicroLogix Counters	p. 230
Modicon 984 Counters	p. 236
Combining Timers and Counters	p. 238
Chapter Summary	p. 239
Review Questions	p. 240
Data Manipulation	p. 242
Data Transfer	p. 242
Allen-Bradley PLC-5, SLC 500, and MicroLogix Data Transfer Instructions	p. 243
Modicon PLC	p. 247
Data Compare	p. 247
Allen-Bradley PLC-5, SLC 500, and MicroLogix Data Compare Instructions	p. 248
Chapter Summary	p. 257
Review Questions	p. 257
Math Functions	p. 259
Using Math Functions	p. 259
Allen-Bradley PLC-5, SLC 500, and MicroLogix Math Instructions	p. 259
Combining Math Functions	p. 264
Gould 984 Arithmetic (Math) Instruction	p. 266
Chapter Summary	p. 270
Review Questions	p. 270
Word and File Moves	p. 271
Words	p. 271
Synchronous Shift Register	p. 271
Allen-Bradley PLC-5, SLC 500, and MicroLogix Bit Shift Instructions	p. 273
File Moves	p. 278
Word-to-File Instruction	p. 278
File-to-Word Instruction	p. 279
File-to-File Instruction	p. 280
Allen-Bradley PLC-5, SLC 500, and MicroLogix File Copy Instruction	p. 281
Gould Data Transfer Instructions	p. 282
Asynchronous Shift Register (FIFO)	p. 286
Allen-Bradley PLC-5, SLC 500, and MicroLogix FIFO Instruction	p. 287
Last-In First-Out (LIFO) Instructions	p. 289
Gould First In Function Block	p. 290
Last In-First Out (LIFO)	p. 292
Chapter Summary	p. 292
Review Questions	p. 292
Sequencers	p. 294
Masks	p. 297
Allen-Bradley PLC-5, SLC 500, and MicroLogix 1000 Sequencer Instruction	p. 298
Chapter Summary	p. 303
Review Questions	p. 303
Programming With Boolean	p. 305
Boolean Algebra	p. 305
Programming in Boolean	p. 309
Timers	p. 318
Chapter Summary	p. 319
Review Questions	p. 319
Understanding Basic MS-DOS Commands	p. 322
Starting the Computer	p. 322
Formatting a Disk	p. 323
Creating Files and Directories	p. 324
Directory (DIR) Command	p. 327
Interrupt Command (Break Command)	p. 328
Clear Screen Command	p. 328
Copy Command	p. 328
Making Directories Command	p. 330
Change Directories Command	p. 330
Renaming Files Command	p. 330
Delete Files Command	p. 330
Remove Directory Command	p. 331
Directory Tree Command	p. 331
Chapter Summary	p. 333
Review Questions	p. 333
Start Up and Troubleshooting	p. 334
Start Up	p. 334
Testing Inputs	p. 336
Testing Outputs	p. 337
Final System Checkout	p. 339
Troubleshooting	p. 340
Chapter Summary	p. 344
Review Questions	p. 344
Glossary	p. 347
Index	p. 361
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