Allen-Bradley micrologix 1500, User Manual

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Publication 1764-UM001A-US-P
C-2 Troubleshooting Your System
When Operating Normally
The POWER and RUN LEDs are on. If a force condition is active, the FORCE
LED turns on and remains on until all forces are removed.
When an Error Exists
If an error exists within the controller, the controller LEDs operate as described in
the following tables.
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
Rockwell Automation 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 4. Monitor Status File Word S:6 for
major error code. See page C-4 for
more information.
5. Remove hardware/software
condition causing fault.
6. Clear Major Error Halted flag, bit
S2:1/13.
7. Attempt a controller Run mode entry.
If unsuccessful, repeat recommended
action steps above or contact your
local Rockwell Automation
distributor.