Cutler-Hammer D320 PLC, User Manual

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Table of Contents
ix
Shielding Cabling............................................................................................................................................... 188
Switching Noise/Crosstalk ................................................................................................................................. 188
Methods to Handle I/O Inductive Loads ............................................................................................................ 189
Warning.............................................................................................................................................................. 191
Troubleshooting ................................................................................................................................................. 192
Chapter
9: External Dimensions 193
System Dimensions............................................................................................................................................ 194
Base Backplane .......................................................................................................................................... 194
Expansion Backplane ................................................................................................................................. 195
Power Supply Module Dimensions.................................................................................................................... 196
CPU and Remote I/O Slave Module Dimensions .............................................................................................. 196
I/O Module and Intelligent Module Dimensions................................................................................................ 197
Integrated Remote I/O Drop Dimensions........................................................................................................... 197
Appendix A: D320 PLC Communication Protocol 199
Communication Rules........................................................................................................................................ 200
Communication Environment .................................................................................................................... 200
Communication Protocol ................................................................................................................................... 200
Step 1

Query (Q) ..................................................................................................................................... 200
Step 2

Query Acknowledge (QA) ........................................................................................................... 200
Step 3

Response Request (RR)................................................................................................................ 200
Step 4

Response (R) ................................................................................................................................ 200
Step 5

Repeated Response....................................................................................................................... 201
Communications Delay.............................................................................................................................. 201
Example ..................................................................................................................................................... 201
CPU ID....................................................................................................................................................... 202
Function Codes Included in the Query....................................................................................................... 202
Cyclic Redundancy Checking (CRC)......................................................................................................... 203
The Structure of the Communications Frame .................................................................................................... 204
Read Bits.................................................................................................................................................... 205
Write Bits ................................................................................................................................................... 206
Read Words................................................................................................................................................ 207
Write Words............................................................................................................................................... 208
Read Bits and Words.................................................................................................................................. 209
Write Bits and Words................................................................................................................................. 210
Communication Program Example .................................................................................................................... 211
Appendix B: PID Loop Control 217
Overview............................................................................................................................................................ 218
PID Algorithm in the D320CPU320 .................................................................................................................. 218
Parameter Descriptions ...................................................................................................................................... 222
PID Example ...................................................................................................................................................... 224
Description ................................................................................................................................................. 224
Ladder Program.......................................................................................................................................... 225
Appendix C: COM2 UDCP Specification 229
Overview............................................................................................................................................................ 230
Port Configuration.............................................................................................................................................. 230
Configuration Flags.................................................................................................................................... 231
Communication System Registers.............................................................................................................. 232
Descriptions of Configuration Flags and Registers.................................................................................... 232