10–7
Troubleshooting
Publication
1747-6.2
The Following
Error Exists
Probable Cause Recommended Action
Initial CPU Factory
Power-up
Condition
1. Refer to chapter 8 and follow the start-up procedures.
2. Clear processor memory to get rid of the flashing CPU
FAULT LED.
CPU Major
Fault
Hardware/Software
Major Fault
Detected
Erratic repetitive
power cycling can
cause a processor
major hardware
fault.
1. Monitor Status File Word S:6 for major error code.
2. Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or the Instruction Set
Reference Manual for error codes and additional
troubleshooting information.
3. Remove hardware/software condition causing fault.
4. Clear Status File S:1/13 major error bits, if set.
5. Clear Status File S:5 minor error bits, if set.
6. Clear Status File S:6 major error code (optional).
7. Attempt a processor Run mode entry.
If unsuccessful, repeat recommended action steps above.
The Following
Error Exists
Probable Cause Recommended Action
System does
not operate per
ladder logic.
User Forced I/O
Disabling
Operation
1. Monitor program file online and identify forced I/O.
2. Disable appropriate forces and test system conditions
again.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
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 RUN LED on the SLC 5/01 processor is
actually labeled “PC RUN.” Also, the
SLC 5/01 processor does not have a COMM
LED.
Indicates the LED is FLASHING.
Status of LED does not matter.
POWER
RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:
➀
POWER
RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
If the LEDs indicate:
➀
AB PLCs
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