Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 98)

Chapter 8
Troubleshooting
8–7
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 the Advanced
Programming Software User Manual, Catalog Number
1747-NM002.
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 page 7-4 .
2. Replace the battery. See page 7-4.
3. Refer to processor major fault recommended action
steps.
Refer to either the Hand-Held Terminal User Manual,
Catalog Number 1747-NP002, or the Advanced
Programming Software User Manual, Catalog Number
1747-NM002.
Refer to the following key to determine the status
of the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
Indicates the LED is FLASHING.
Regardless of any other LED status indicator condiĆ
tions, always replace the battery when the BATTERY
LOW LED is on if you want RAM battery backup. If
you want to back up RAM with a capacitor, add or
replace the BATTERY LOW LED jumper.
➀
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW
If the LEDs indicate:
POWER
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW
➀