Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 153)

Publication 1747-UM011G-EN-P - June 2008
Troubleshooting 153
• Power status indicator
is on
• CPU Fault status
indicator is flashing
• All other status
indicators are off
• Status of any
Communication status
indicator does not
matter
CPU major fault Initial CPU factory
power-up condition.
1. See page 121 and follow the start-up procedures.
2. Clear processor memory to get rid of the flashing CPU Fault
status indicator.
Hardware/software
major fault
detected.
(erratic, repetitive
power cycling can
cause a processor
major hardware
fault)
1. If the error occurred during the download of a new program
to the processor, check the position of the J4 jumper. See
page 159. If the jumper is not in the protected position:
a. Place the jumper in the protected position
b. Re-download a valid user program to the processor
2. Use programmer to monitor and clear the fault (or if
keyswitch in REM position):
a. Monitor Status File word S:6 for major error code.
b. Refer to your programming software documentation or the
SLC 500 Instruction Set Reference Manual, publication
1747-RM001, for error codes and additional
troubleshooting information.
c. Remove hardware/software condition causing fault.
d. Clear Status File S:1/13 major error bits, if set.
e. Clear Status File S:5 major error bits, if set.
f. Clear Status File S:6 major error code (optional).
g. Attempt to put processor in run mode.
If unsuccessful, repeat recommended action steps above.
3. Use the keyswitch to clear the fault. Toggle the keyswitch to
PROG and back to RUN. (See page 149). If fault occurs again,
use programmer to get error code and determine the source
of the problem.
SLC 5/03, SLC 5/04, and SLC 5/05 Processor Errors
If the status indicators
indicate The following
error exists Probable Cause Recommended Action