Rockwell Automation 1785 PLC-5 User Manual Page 29
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Publication 1785-UM012D-EN-P - July 2005
Understanding Your Programmable Controller 1-11
Using a Controller Channel
as a Remote I/O Scanner
Configure a remote I/O channel for scanner mode to read and write I/O
information between a controller and an I/O device remotely located from the
controller.
Remote I/O
Link Cable:
Belden 9463
PLC-5/40
1771-ASB
PLC-5/20
A controller with a channel configured for scanner mode
acts as a supervisory controller for other controllers that
are in adapter mode as well as remote I/O adapter modules.
The scanner-mode PLC-5 controller can:
gather data from node adapter devices in remote I/O racks
process I/O data from 8-, 16-, or 32-point I/O modules
address I/O in 2-, 1-, or 1/2-slot I/O groups
support a complementary I/O configuration
support block-transfer in any I/O chassis
Output Input
PLC-5
Data Table
The scanner-mode PLC-5 controller:
transfers discrete data and block-transfer data
to/from modules in remote I/O racks as well as
to/from controllers in adapter mode.
scans remote I/O buffers asynchronously to the
program scan.
updates the input/output image data table from
the remote I/O buffer(s) synchronously to the
program scan
Controller
-resident
I/O
PLC-5 data table
is updated
synchronously to
program scan
(at housekeeping).
Remote I/O buffers
are updated
asynchronously to
the program scan.
Output
Input
Remote I/O
Buffer
Remote I/O
Link
- Enhanced and 1
- Ethernet PLC-5 1
- Programmable 1
- Controllers 1
- Important User Information 2
- Summary of Changes 3
- Summary of Changes 2 4
- Table of Contents 5
- Table of Contents 2 6
- Table of Contents 3 7
- Table of Contents 4 8
- Chapter 12 9
- Chapter 13 9
- Chapter 14 10
- Preparing Power-Up Routines 10
- Chapter 15 10
- Preparing Fault Routines 10
- Table of Contents 7 11
- Appendix C 12
- Maximizing System Performance 12
- Appendix D 12
- Appendix E 13
- Switch Setting Reference 13
- Appendix F 13
- Troubleshooting 13
- Appendix G 14
- Cable Reference 14
- Using This Manual 15
- Terms Used in This Manual 16
- Manual Overview 17
- Preface 4 18
- Lay Out the System 19
- Identifying Controller 20
- Components 20
- PLC-5/11 Controller 21
- PLC-5/20 or -5/26 Controller 21
- PLC-5/20E 24
- Controller 24
- PLC-5/40E 25
- PROG (program) 27
- REM (remote) 27
- Programming Features 28
- Using a Controller Channel 29
- Using a PLC-5/40L, -5/60L 32
- Programmable Controller 32
- Selecting and Placing I/O 33
- Selecting I/O Module 34
- Placing I/O Modules in a 35
- Placing System Hardware 37
- Protecting Your Controller 39
- Preventing Electrostatic 39
- Discharge 39
- Laying Out Your Cable 40
- Laying Out Your 41
- Backpanel Spacing 41
- Grounding Your System 42
- I/O Addressing Concept 45
- I:014/12 46
- Choosing an Addressing 47
- 18-and 16-point Example 48
- 32-point Example 49
- Addressing 51
- Block-Transfer Modules 51
- Addressing Summary 51
- Assigning Racks 52
- Understanding PLC-5 54
- Controller Memory 54
- • data blocks within a file 56
- • modules in an I/O chassis 56
- Addressing File Types 57
- Specifying Logical Addresses 61
- Specifying Indirect Addresses 62
- Specifying Indexed Addresses 64
- Specifying Symbolic Addresses 65
- Effectively Using 68
- I/O Memory 68
- Program scanning 5-2 69
- Program Scanning 70
- Transferring Data to 71
- Controller-Resident I/O 71
- Configuring the System 72
- Communicating with Remote I/O 73
- Introduction to Remote I/O 75
- Designing a Remote I/O 76
- Cable Design Guidelines 77
- Configuring a Controller 78
- Channel as a Scanner 78
- Define an I/O Status File 79
- Specify the Scan List 81
- Communicating to a 83
- Remote I/O Node Adapter 83
- Block-Transfers of 87
- Remote I/O Data 87
- AdapterAdapter 88
- Block-Transfer Sequence 89
- Block-Transfer 91
- Programming 91
- Scanner Channels 93
- Monitoring messages 95
- Addressing the I/O 96
- Status File 96
- Not Used 97
- Fault BitsPresent Bits 97
- Communicating with a PLC-5 99
- Adapter Channel 99
- Communication to a 100
- PLC-5 Adapter Channel 100
- Configuring 100
- Address, and Rack Size 101
- IMPORTANT 104
- Data Monitor screen 110
- PLC-5 Supervisory Controller 112
- Monitoring Remote I/O 117
- Adapter Channels 117
- Using This Chapter 119
- Selecting Devices That You 119
- Can Connect 119
- Addressing and Placing I/O 120
- Remote I/O racks 121
- Transferring Data 122
- Discrete Data Transfer 123
- Transferring Block Data 124
- Configuring the Controller 127
- Monitoring Extended-Local 130
- I/O Status 130
- Selecting Devices That 133
- You Can Connect 133
- Link Design 134
- Configuring the Channel 135
- [Enter] 136
- Using the Global Status 137
- Flag File 137
- Monitoring DH+ 139
- Communication Channels 139
- Monitoring General Status 143
- Estimating DH+ Link 144
- Performance 144
- Size and Number of Messages 145
- Message Destination 146
- Internal Processing Time 147
- Application Guidelines 149
- Choosing Between 151
- RS-232C, RS-422A, and 151
- Serial Port 152
- Using Channel 0 152
- Changing Modes 155
- Configuring Channel 0 156
- Monitoring Channel 0 172
- Media and Cabling 175
- Assigning Your IP Address 176
- Network Addressing 176
- Configuring Channel 2 for 176
- Ethernet Communication 176
- No. Enter further 177
- See page 11-12 179
- BOOTP Enable 180
- BOOTP response not 180
- 1 = 10MB Ethernet 182
- Using Advanced 183
- Ethernet Functions 183
- No Gateway 186
- Using Domain Name 189
- Using the Embedded Web 190
- HTML Pages 196
- Using Multihop Messaging 203
- Multihop Examples 204
- Communicating with 206
- ControlLogix Devices 206
- Interpreting Error Codes 207
- Interpreting Ethernet Status 208
- Monitoring Ethernet commands 210
- Monitoring Ethernet replies 210
- Considerations 211
- PLC-5 Controller 212
- Protecting Your Programs 213
- Privileges 214
- About Passwords and 214
- Defining Privilege Classes 215
- Assigning a Privilege Class 216
- Assigning Read/Write 217
- Privileges to a Program File 217
- Privileges to a Data File 217
- Programming Considerations 219
- Extended Forcing 220
- BTW instruction execution 221
- BTR instruction execution 221
- Increased Program Scan Time 222
- I/O Force Privileges 222
- Setting Up and Using 223
- Using Special 228
- Programming Routines 228
- Priority Scheduling for 229
- Interrupts and MCPs 229
- Program Execution States 230
- Rescheduling Operation 231
- Defining and Programming 233
- Interrupt Routines 233
- Allowing or Inhibiting 236
- Defining a Controller 236
- Power-Up Procedure 236
- Understanding 240
- Controller-Detected Major 240
- Fault in a Remote I/O Chassis 241
- Defining a Fault Routine 242
- Defining a Watchdog Timer 243
- Programming a Fault 244
- Setting an Alarm 245
- Clearing a Major Fault 245
- I/O rack fault 248
- Monitoring Faults 249
- Interpreting Major Faults 250
- Interpreting Minor Faults 250
- Monitoring Status Bits 251
- Using Main Control Programs 253
- Understanding How the 254
- Controller Interprets MCPs 254
- Configuring MCPs 255
- Monitoring MCPs 257
- Using a Selectable Timed 259
- Interrupt 259
- STI Application Example 260
- Defining a Selectable 261
- Timed Interrupt 261
- Monitoring Selectable 262
- Timed Interrupts 262
- Using a Processor Input 263
- Writing PII Ladder Logic 264
- PII Application Examples 264
- Design Considerations 266
- Input Interrupt 267
- Monitoring Controller 268
- Input Interrupts 268
- System Specifications 269
- Memory Backup Devices 272
- Processor Status File 275
- • S:7/8-15 unused 277
- S:13-S:24 283
- S:26-S:35 284
- S:36-S:78 285
- S:79-S:127 286
- Effects of Housekeeping Time 290
- Input and Output Modules 292
- I/O Backplane Transfer 292
- Remote I/O Scan Time 292
- Communication Rate 293
- Number of Rack Entries 293
- Block-Transfers 294
- BT BT BT 296
- Controller Time 297
- Example Calculation 298
- Performance Effects of 298
- Online Operations 298
- Effect of Inserting 299
- Ladder Rungs at the 299
- 56K-word Limit 299
- Using Program Control 300
- Instructions 300
- Appendix 301
- Relay Instructions 302
- Timer Instructions 303
- Counter Instructions 304
- Compare Instructions 305
- Compute Instructions 307
- Logical Instructions 314
- Conversion Instructions 315
- File Instructions 317
- Diagnostic Instructions 319
- Shift Register Instructions 320
- Sequencer Instructions 321
- Program Control Instructions 322
- Block Transfer Instructions 325
- ASCII Instructions 327
- Bit and Word Instructions 330
- L = number of FOR/NXT loops 334
- Controller Switches 340
- Switch 2 341
- I/O Chassis Backplane 342
- Extended-Local I/O Adapter 343
- ATTENTION 344
- Remote I/O Adapter Module 345
- Extended-Local I/O 347
- Adapter Module 347
- (1771-ALX) Configuration Plug 348
- Troubleshooting F-3 351
- Ethernet Status Indicator 353
- Remote I/O System 354
- Adapter Module (continued) 356
- ADAPTER 357
- I/O RACK 357
- Unexpected Operation 358
- Suggested Action 359
- F-12 Troubleshooting 360
- Serial Cable Pin 362
- Assignments 362
- Connecting Diagrams 363
- 25-Pin Serial Port 364
- Workstation 364
- Programming Cable 365
- Specifications 365
- Cable - 1784-CP6 366
- -CP5, or -PCM5 cable 366
- Cable - 1784-CP10 367
- Cable - 1784-CP11 368
- Cable - 1784-PCM5 368
- Ethernet Cable Connections 369
- G-10 Cable Reference 370
- Numerics 371
- 2 Index 372
- Index 3 373
- 4 Index 374
- Index 5 375
- 6 Index 376
- Index 7 377
- 8 Index 378
- Index 9 379
- 10 Index 380
- Index 11 381
- 12 Index 382
- How Are We Doing? 383
- BUSINESS REPLY MAIL 384
- Rockwell Automation 388
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