Name: Allen-Bradley PLC-5
Brand: Allen-Bradley
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Publication 1785-UM012D-EN-P - July 2005

9-10 Communicating with Devices on a DH+ Link

Monitoring Data Sent without Acknowledgment

Status Field Word(s) Description

Received 35 Number of valid SDN messages received

Transmit failed 33 Number of SDN messages sent by the station that were in error

This error should never be seen.

Transmit confirm 32 Number of valid SDN messages sent by the station

Default Chapter3
- Summary of Changes3
- Table of Contents5
- Purpose of this Manual15
- Related PLC-5 Documentation15
- Terms Used in this Manual16
- Manual Overview17
Chapter 119
- Using this Chapter19
- Lay out the System19
- Identifying Controller Components20
  - PLC-5/11, -5/20, and -5/26 Controller Front Panels21
  - Controller Front Panel22
- Programming Features28
- Using a Controller Channel as a Remote I/O Scanner29
Appendix C Program Scan29
- Using a Controller Channel as a Remote I/O Adapter30
- Using a PLC-5/40L, -5/60L Programmable Controller as an Extended-Local I/O Scanner32
Chapter 2 Using this Chapter33
- Selecting I/O Modules33
  - Guidelines for Selecting I/O Modules34
- Selecting I/O Module Density34
- Placing I/O Modules in a Chassis35
- Using this Chapter37
Chapter 337
- Determining the Proper Environment37
- Protecting Your Controller39
- Preventing Electrostatic Discharge39
- Laying out Your Cable Raceway40
  - Categorize Conductors40
  - Route Conductors40
- Laying out Your Backpanel Spacing41
  - Chassis Dimensions (Series B)41
  - I/O Chassis and External Power Supply Dimensions42
- Grounding Your System42
- Using this Chapter45
Chapter 445
- I/O Addressing Concept45
- Choosing an Addressing Mode47
- Addressing Block-Transfer Modules51
- Addressing Summary51
- Assigning Racks52
- Understanding PLC-5 Controller Memory54
- Addressing60
- Effectively Using I/O Memory68
Chapter 569
- Using this Chapter69
- Introduction to PLC-5 Controller Scanning69
- Program Scanning70
- Transferring Data to Controller-Resident I/O71
- Configuring the System for Controller-Resident I/O72
- Using this Chapter73
Chapter 674
- Selecting Devices that You Can Connect74
- Introduction to Remote I/O75
- Designing a Remote I/O Link76
- Configuring a Controller Channel as a Scanner78
- Communicating to a Remote I/O Node Adapter83
  - Troubleshooting Remote I/O Communication Difficulties84
- Transferring Block Data85
- Block-Transfers of Remote I/O Data87
- Block-Transfer Sequence with Status Bits89
- Block-Transfer Programming Considerations91
  - General Considerations91
  - For Controller-Resident Local Racks92
- Monitoring Remote I/O Scanner Channels93
  - Monitoring Transmission Retries93
- Addressing the I/O Status File96
Chapter 7 Using this Chapter99
- Configuring Communication to a PLC-5 Adapter Channel99
- Programming Discrete Transfers in Adapter Mode108
- Programming Block-Transfers of Data to an Adapter Channel108
- Monitoring Remote I/O Adapter Channels117
Chapter 8 Using this Chapter119
- Selecting Devices that You Can Connect119
- Cabling120
- Addressing and Placing I/O120
- Transferring Data122
- Configuring the Controller as an Extended-Local I/O Scanner127
- Monitoring Extended-Local I/O Status130
Chapter 9 Using this Chapter133
- Selecting Devices that You Can Connect133
- Link Design134
- Configuring the Channel for DH+ Communication135
- Using the Global Status Flag File137
- Monitoring DH+ Communication Channels139
- Estimating DH+ Link Performance144
- Application Guidelines149
- Using this Chapter151
Chapter 10152
- Configuring the Controller152
- Serial Port152
- Using Channel 0152
- Cabling155
- Configuring Channel 0156
- Monitoring Channel 0 Status172
  - Using the System Mode Status Display172
  - Using the User Mode (ASCII) Status Display174
- Using this Chapter175
Chapter 11175
- Media and Cabling175
- Assigning Your IP Address176
- Network Addressing176
- Configuring Channel 2 for Ethernet Communication176
- Using Advanced Ethernet Functions183
- Using Domain Name Service189
- Using the Embedded Web Server190
  - Generating User Provided Web Pages196
  - Importing User Page Files to the PLC-5 Controller200
- Using Multihop Messaging203
  - Multihop Examples204
  - Over Ethernet206
- Communicating with Controllogix Devices206
- Tcp/Ip206
- Interpreting Error Codes207
- Interpreting Ethernet Status Data208
- Ethernet PLC-5 Performance Considerations211
- Using this Chapter213
Chapter 12214
- About Passwords and Privileges214
- Defining Privilege Classes215
- Assigning a Privilege Class to a Channel or Offline File216
- Assigning a Privilege Class to a Node216
- Assigning Read/Write Privileges to a Program File217
- Assigning Read/Write Privileges to a Data File217
Chapter 13219
- Using this Chapter219
- Forcing219
  - Forcing Inputs and Outputs219
  - Forcing SFC Transitions220
- Extended Forcing220
- Setting up and Using Extended Forcing223
- Using Special Programming Routines228
- Priority Scheduling for Interrupts and Mcps229
  - Program Execution States230
  - Influencing Priority Scheduling232
- Defining and Programming Interrupt Routines233
Programming Considerations219
Chapter 14235
- Using this Chapter235
- Setting Power-Up Protection235
- Allowing or Inhibiting Startup236
- Defining a Controller Power-Up Procedure236
- Using this Chapter239
Preparing Power-Up Routines235
Chapter 15 Understanding the Fault Routine Concept239
- Responses to a Major Fault239
- Understanding Controller-Detected Major Faults240
  - Fault in a Controller-Resident or Extended-Local I/O Rack241
  - Fault in a Remote I/O Chassis241
- Defining a Fault Routine242
- Defining a Watchdog Timer243
  - Avoiding Multiple Watchdog Faults244
- Programming a Fault Routine244
- Monitoring Faults249
- Using this Chapter253
Chapter 16253
- Selecting Main Control Programs253
- Understanding How the Controller Interprets Mcps254
- Configuring Mcps255
- Monitoring Mcps257
- Using this Chapter259
Chapter 17 Using a Selectable Timed Interrupt259
- Writing STI Ladder Logic259
- STI Application Example260
- Block-Transfers in Selectable Timed Interrupts (Stis)260
- Defining a Selectable Timed Interrupt261
- Monitoring Selectable Timed Interrupts262
- Using this Chapter263
Chapter 18 Using a Processor Input Interrupt263
- Writing PII Ladder Logic264
- PII Application Examples264
- Block-Transfers in Processor Input Interrupts (Piis)265
- Design Considerations266
- Defining a Controller Input Interrupt267
- Monitoring Controller Input Interrupts268
Appendix A269
- Controller Specifications269
- Memory and Channel Specifications270
- Memory Backup Devices272
  - EEPROM Compatibility272
Appendix B277
- S:3-10277
- S:11278
- S:12279
- S:13-S:24283
- S:26-S:35284
- S:36-S:78285
- S:79-S:127286
- I/O Backplane Transfer291
- Input and Output Modules Delay291
- Remote I/O Scan Time291
- Controller Time297
- Example Calculation298
- Performance Effects of Online Operations298
- Effect of Inserting Ladder Rungs at the 56K-Word Limit299
- Using Program Control Instructions300
  - Using JMP/LBL Instructions300
  - Using FOR/NXT Instructions300
Appendix D301
- Compare Instructions301
- Compute Instructions301
- Counter Instructions301
- Relay Instructions301
- Timer Instructions301
- Logical Instructions314
- Conversion Instructions315
- Bit Modify and Move Instructions316
- File Instructions317
- Diagnostic Instructions319
- Shift Register Instructions320
- Sequencer Instructions321
- Program Control Instructions322
- Block Transfer Instructions325
- Process Control, Message Instructions325
- Publication 1785-UM012D-EN-P - July325
- ASCII Instructions327
- Bit and Word Instructions330
- File, Program Control, and ASCII Instructions332
Appendix E Controller Switches340
- Switch 1340
- Switch 2340
- I/O Chassis Backplane342
- ASB Series C and D) Without Complementary I/O345
- Remote I/O Adapter Module345
- Extended-Local I/O Adapter Module347
- ALX) Configuration Plug348
Appendix F PLC-5 Controller349
Troubleshooting349
- General Problems350
- Controller Communication Channel Troubleshooting352
- Extended-Local I/O Troubleshooting353
- Ethernet Status Indicator353
- Ethernet Transmit LED354
- Remote I/O System354
  - Adapter Module354
  - Adapter Module (Continued)356
- Extended-Local I/O System357
  - Troubleshooting Guide for the 1771-ALX Adapter Module357
- Unexpected Operation When Entering Run Mode358
Appendix G361
- Channel 0 Pin Assignments361
- Connecting Diagrams361
- Programming Cable Specifications361
- Serial Cable Pin Assignments361
- Using this Chapter361
- Ethernet Cable Connections369

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Allen-Bradley PLC-5 Specifications

General

Programming Software	RSLogix 5
Programming Languages	Ladder Logic
Power Supply	120/240V AC or 24V DC
Communication Ports	DH+, Remote I/O, Ethernet/IP, ControlNet
Operating Temperature	0 to 60°C (32 to 140°F)
Relative Humidity	5 to 95% non-condensing
Memory	Up to 64K words (user program and data)