10–8
Troubleshooting
Publication 1747-6.2
The Following
Error Exists
Probable Cause
Recommended Action
System does
not operate per
programmed
forces.
User Programmed
Forces are Not
Enabled
1. Monitor program file online and identify programmed
forces.
2. Enable appropriate forces and test system conditions
again. Once forces are enabled, the FORCED I/O LED
goes on steady.
Refer to either the Hand-Held Terminal User Manual
(Catalog Number 1747-NP002) or your programming
software user manual.
The Following
Error Exists
Probable Cause
Recommended Action
CPU Major
Error with Low
or No Battery
Back-up
Loss of RAM
during Power
Down Period
1. Verify battery is connected. See pages 6–1 and 9–4.
2. Replace the battery if you want RAM battery backup.
See page 9–4. If you want to back up RAM with the
capacitor in a SLC 5/01 (1747-L511), add or replace the
BATTERY LOW LED jumper.
3. Refer to processor major fault recommended action
steps.
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
