Controller error recovery model – Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual User Manual
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Rockwell Automation Publication 1766-UM001H-EN-P - May 2014
Appendix C Troubleshooting Your System
Controller Error Recovery
Model
Use the following error recovery model to help you diagnose software and
hardware problems in the micro controller. The model provides common
questions you might ask to help troubleshoot your system. Refer to the
recommended pages within the model for further help.
If the LEDS
indicate:
The Following Error
Exists
Probable Cause
Recommended Action
All LEDs off
No input power or
power supply error
No line Power
Verify proper line voltage and connections to the controller.
Power Supply
Overloaded
This problem can occur intermittently if power supply is overloaded when
output loading and temperature varies.
Power and FAULT
LEDs on solid
Hardware faulted
Processor Hardware
Error
Cycle power. Contact your local Allen-Bradley representative if the error
persists.
Loose Wiring
Verify connections to the controller.
Power LED on and
FAULT LED flashing
Application fault
Hardware/Software
Major Fault Detected
For error codes and Status File information, see MicroLogix 1400
Programmable Controllers Instruction Set Reference Manual, Publication
RUN
FORCE
FAULT LEDs all
flashing
Operating system fault
Missing or Corrupt
Operating System
See Recovering from Missing or Corrupt OS State on page D-182.