Specifications

10–22 Troubleshooting
Publication 1747-6.2
If the download is not successful, the FLT LED turns on and a
combination of LEDs flash on and off indicating an error condition.
The following LED diagrams and tables provide you with
information regarding error messages, possible cause(s) for the error,
and recommended action to take to resolve the error.
The Following
Error Exists
Probable Cause Recommended Action
NVRAM error
Major hardware failure due to
noise, improper grounding, or
poor power source.
Cycle power and see if the error
repeats itself. If the error clears, you
should be able to download the
operating system. If the error persists,
contact your Allen-Bradley
representative.
The Following
Error Exists
Probable Cause Recommended Action
Hardware
Watchdog Timeout
Major hardware failure due to
noise, improper grounding, or
poor power source.
Cycle power and see if the error
repeats itself. If the error clears, you
should be able to download the
operating system. If the error persists,
contact your Allen-Bradley
representative.
The Following
Error Exists
Probable Cause Recommended Action
Fatal Hardware
Error
Major hardware failure due to
noise, improper grounding, or
poor power source.
Cycle power and see if the error
repeats itself. If the error clears, you
should be able to download the
operating system. If the error persists,
contact your Allen-Bradley
representative.
Refer to the following key to determine the status of
the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
➀
The DH485 LED on the SLC 5/03 processor is labeled DH+ on
the SLC 5/04 processor, and ENET on the SLC 5/05 processor.
If the LEDs indicate:
➀
POWER
RUN
FLT
BATT
FORCE
DH485
RS232
POWER
RUN
FLT
BATT
FORCE
DH485
RS232
If the LEDs indicate:
➀
POWER
RUN
FLT
BATT
FORCE
DH485
RS232
If the LEDs indicate:
➀