Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 126)

Publication 1764-UM001B-EN-P - April 2002
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.
INPUTS off input is not energized
amber input is energized (logic status)
OUTPUTS off output is not energized
amber output is energized (logic status)
(1) When using a 1764-LRP processor, the DCOMM LED applies only to Channel 0.
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 1. Monitor Status File Word
S:6 for major error code.
See page C-5 for more
information.
2. Remove hardware/software
condition causing fault.
3. Clear Major Error Halted
flag, bit S2:1/13.
4. Attempt a controller Run
mode entry. If unsuccessful,
repeat recommended action
steps above or contact your
local Rockwell Automation
distributor.
LED Color Indicates