Publication 1763-UM001E-EN-P - June 2015
188 Troubleshooting Your System
Normal Operation
Under normal operating conditions, the POWER and RUN LEDs are ON. If
forcing is enabled and forces are installed in the I/O force files, the FORCE
LED turns ON and continues to be ON until all forces are removed. If
forcing is disabled and forces are installed in the I/O force files, the FORCE
LED flashes and continues to flash until all forces are removed from the I/O
force files.
Error Conditions
If an error exists within the controller, the controller LEDs operate as
described in the following table.
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 1100
Programmable Controllers Instruction Set Reference Manual,
Publication 1763-RM001.
RUN
FORCE
FAULT LEDs all
flashing
Operating system
fault
Missing or Corrupt
Operating System
See Missing/Corrupt OS LED Pattern on page D-197.
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