Page 8 - Programmable Logic Controllers, Fifth Edition
P. 8
Chapter 13 PLC Installation Practices,
Editing, and Troubleshooting 281 Routines ............................ 337
Tags................................ 337
Structures ........................... 340
13.1 PLC Enclosures....................... 282 Creating Tags ........................ 341
13.2 Electrical Noise....................... 284 Monitoring and Editing Tags ............ 342
13.3 Leaky Inputs and Outputs............... 285 Array............................... 342
13.4 Grounding........................... 285 Review Questions ..................... 344
13.5 Voltage Variations and Surges............ 287 Part 2 Bit-Level Programming ............... 345
13.6 Program Editing and Commissioning...... 288 Program Scan ........................ 345
13.7 Programming and Monitoring ........... 289 Creating Ladder Logic ................. 346
13.8 Preventive Maintenance ................ 291 Tag-Based Addressing ................. 347
13.9 Troubleshooting ...................... 292 Adding Ladder Logic to the Main Routine.. 348
Processor Module ..................... 292 Internal Relay Instructions .............. 350
Input Malfunctions .................... 292 Latch and Unlatch Instructions........... 352
Output Malfunctions ................... 294 One-Shot Instruction................... 353
Ladder Logic Program ................. 294 Review Questions ..................... 356
13.10 PLC Programming Software............. 299 Problems ............................ 356
Review Questions............................ 302 Part 3 Programming Timers ................. 358
Problems .................................. 302
Timer Predefined Structure.............. 358
On-Delay Timer (TON) ................ 359
Chapter 14 Process Control, Network
Systems, and SCADA 305 Off-Delay Timer (TOF) ................ 362
Retentive Timer On (RTO) .............. 364
14.1 Types of Processes .................... 306 Cascading of Timers ................... 365
14.2 Structure of Control Systems ............ 308 Review Questions ..................... 367
14.3 On/Off Control ....................... 310 Problems ............................ 367
14.4 PID Control.......................... 311 Part 4 Programming Counters ............... 368
14.5 Motion Control ....................... 315 Counters ............................ 368
14.6 Data Communications.................. 316 Count-Up (CTU) Counter............... 369
Data Highway........................ 322 Count-Down (CTD) Counter ............ 371
Serial Communication ................. 322 Combining Counter and Timer Functions .. 372
DeviceNet ........................... 322 Review Questions ..................... 373
ControlNet........................... 325 Problems ............................ 373
EtherNet/IP.......................... 325 Part 5 Math, Comparison,
Modbus ............................. 326 and Move Instructions ................ 374
Fieldbus............................. 326 Math Instructions ..................... 374
PROFIBUS-DP....................... 326 Comparison Instructions................ 376
14.7 Supervisory Control Move Instructions ..................... 379
and Data Acquisition (SCADA) .......... 328 Combining Math, Comparison,
Review Questions............................ 331 and Move Instructions.................. 380
Problems .................................. 332 Review Questions ..................... 383
Problems ............................ 383
Chapter 15 ControlLogix Controllers 333 Part 6 Function Block Programming .......... 384
Function Block Diagram (FBD) .......... 384
Part 1 Memory and Project Organization ...... 334 FBD Programming .................... 388
Memory Layout ...................... 334 Review Questions ..................... 394
Configuration ........................ 334 Problems ............................ 394
Project.............................. 335
Tasks ............................... 336 Glossary ................................... 395
Programs............................ 336 Index ..................................... 407
Contents vii
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