ALLEN BRADLEY 1747-L551 PLC Processor

Table of Contents
vii
Identifying SLC 5/02 Processor Communication Errors . . . . . . . 10–9
Troubleshooting the SLC 5/03, SLC 5/04, and SLC 5/05 Processors 10–11
Clearing SLC 5/03, SLC 5/04, and SLC 5/05 Processor Faults
Using the Keyswitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–11
Identifying SLC 5/03, SLC 5/04, and SLC 5/05 Processor Errors 10–12
Identifying SLC 5/03, SLC 5/04, and SLC 5/05 Processor
Communication Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–17
Identifying Processor Errors while
Downloading an Operating System . . . . . . . . . . . . . . . . . . . . 10–21
Returning the SLC 5/03, SLC 5/04, and SLC 5/05 Processors
to “Initial Factory Conditions” . . . . . . . . . . . . . . . . . . . . . . . 10–25
Troubleshooting Your Input Modules . . . . . . . . . . . . . . . . . . . . . . 10–26
Input Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–26
Troubleshooting Your Input Modules . . . . . . . . . . . . . . . . . . . . 10–27
Troubleshooting Your Output Modules . . . . . . . . . . . . . . . . . . . . . 10–28
Output Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10–28
Troubleshooting Your Output Modules . . . . . . . . . . . . . . . . . . . 10–29
Replacement Parts
Setting Up the DH-485
Network
Chapter 11
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–1
Replacement Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–3
Appendix A
DH-485 Network Description . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
DH-485 Network Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
DH-485 Token Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
DH-485 Network Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
Devices that use the DH-485 Network . . . . . . . . . . . . . . . . . . . . . A–2
1747-AIC Isolated Link Coupler for DH-485 . . . . . . . . . . . . . . . . . A–4
Example System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . A–5
Configuring the SLC 5/03, SLC 5/04, and SLC 5/05
Channel 0 for DH485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–6
Important Planning Considerations . . . . . . . . . . . . . . . . . . . . . . . A–7
Hardware Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–7
Number of Devices and Length of Communication Cable . . . A–7
Planning Cable Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–7
Software Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–8
Number of Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–9
Setting Node Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . A–9
Setting Processor Baud Rate . . . . . . . . . . . . . . . . . . . . . . . A–9
Maximum Node Address Setting . . . . . . . . . . . . . . . . . . . . . A–9
Maximum Number of Communicating Devices . . . . . . . . . . . A–10
Installing the DH-485 Network . . . . . . . . . . . . . . . . . . . . . . . . . . . A–10
DH-485 Communication Cable and Isolated Link Coupler . . . . . A–10
Installing the DH-485 Communication Cable . . . . . . . . . . . . . . A–10
Publication 1747-6.2