Download 1762-UM001B-EN-P, MicroLogix 1200 Programmable Controllers

Table of Contents
iv
Appendix C
Troubleshooting Your System
Understanding the Controller LED Status . . . . . . . . . . . .
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Error Recovery Model . . . . . . . . . . . . . . . . . .
Analog Expansion I/O Diagnostics and Troubleshooting.
Module Operation and Channel Operation . . . . . . . .
Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . .
Critical and Non-Critical Errors . . . . . . . . . . . . . . . . .
Module Error Definition Table . . . . . . . . . . . . . . . . .
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calling Rockwell Automation for Assistance . . . . . . . . . .
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C-1
C-1
C-2
C-3
C-4
C-4
C-4
C-4
C-5
C-6
C-7
Appendix D
Using Control Flash to Upgrade
Your Operating System
Preparing for Upgrade. . . . . . . . . . . . .
Install ControlFlash Software . . . . .
Prepare the Controller for Updating
Sequence of Operation . . . . . . . . . . . .
Missing/Corrupt OS LED Pattern . . . . .
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D-1
D-1
D-1
D-2
D-2
RS-232 Communication Interface . . . . . . . . . . . . . . . . .
DF1 Full-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . .
DF1 Full-Duplex Operation . . . . . . . . . . . . . . . . . .
DF1 Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . .
DF1 Half-Duplex Operation . . . . . . . . . . . . . . . . . .
Considerations When Communicating as a
DF1 Slave on a Multi-drop Link . . . . . . . . . . . . . . .
Using Modems with MicroLogix 1200
Programmable Controllers . . . . . . . . . . . . . . . . . . .
DH485 Communication Protocol . . . . . . . . . . . . . . . . .
DH485 Network Description. . . . . . . . . . . . . . . . . .
DH485 Token Rotation. . . . . . . . . . . . . . . . . . . . . .
DH485 Configuration Parameters . . . . . . . . . . . . . .
Devices that use the DH485 Network . . . . . . . . . . .
Important DH485 Network Planning Considerations
Example DH485 Connections . . . . . . . . . . . . . . . . .
Modbus Communication Protocol . . . . . . . . . . . . . . . .
ASCII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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E-1
E-1
E-2
E-3
E-3
Appendix E
Understanding the
Communication Protocols
Publication 1762-UM001B-EN-P
. . . E-5
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E-6
E-8
E-8
E-8
E-9
E-9
E-10
E-13
E-16
E-17