1 Publication 1762-UM001D-EN-P - March 2004
Appendix
C
Troubleshooting Your System
This chapter describes how to troubleshoot your controller. Topics
include:
• understanding the controller LED status
• controller error recovery model
• analog expansion I/O diagnostics and troubleshooting
• calling Rockwell Automation for assistance
Understanding the
Controller LED Status
The controller status LEDs provide a mechanism to determine the
current status of the controller if a programming device is not present
or available.
Figure C.1 Controller LED Location
POWER
RUN
IN
OUT
FAULT
FORCE
COMM 0
DCOMM
0 1 2 3 4 5 6 7 8 9 10 11 12 13
9876543210
Table C.1 Controller LED Indicators
LED Color Indicates
POWER off No input power, or power error condition
green Power on
RUN off Not executing the user program
green Executing the user program in run mode
green flashing Memory module transfer occurring
FAULT off No fault detected
red flashing Application fault detected
red Controller hardware faulted
FORCE off No forces installed
amber Forces installed
COMM 0
(1)
(1)
1762-L24AWAR, -L24BWAR, -L24BXBR, -L40AWAR, -L40BWAR, -L40BXBR controllers are equipped with an
additional communications port (Programmer/HMI Port) but provide no additional LED indcator indicating its
operational status.
off Not transmitting via RS-232 port
green Transmitting via RS-232 port
DCOMM
(2)
off Configured communications
green Default communications
INPUTS off Input is not energized
amber Input is energized (terminal status)
OUTPUTS off Output is not energized
amber Output is engerized (logic status)
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