User manual

Publication 1747-IN011F-EN-P - May 2007
Troubleshooting 149
• Power status indicator
is on
• Run status indicator is
on
• Forced I/O status
indicator is on
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
System does not
operate per ladder
logic
User forced I/O is
disabling operation.
1. Monitor program file on-line and identify forced I/O.
2. Disable appropriate forces and test system conditions again.
• Power status indicator
is on
• Run status indicator is
on
• Forced I/O status
indicator is flashing
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
System does not
operate per
programmed
forces
User programmed
forces are not
enabled.
1. Monitor program file on-line and identify programmed
forces.
2. Enable appropriate forces and test system conditions again.
Once forces are enabled, the Forced I/O status indicator
turns On (steady).
• Power status indicator
is on
• CPU Fault status
indicator is flashing
• Battery Low status
indicator is on
• All other status
indicators are off
• Status of SLC 5/02
Comm status indicator
does not matter
CPU major error
with low or no
battery back-up
Loss of RAM during
power-down.
1. Verify battery is connected. See page 138.
2. Replace the battery if you want RAM battery backup. See
page 138. If you want to back up RAM with the capacitor in a
SLC 5/01 (1747-L511), add or replace the Battery Low status
indicator jumper.
3. Refer to processor major fault recommended action steps.
SLC 5/01 and SLC 5/02 Processor Errors
If the status indicators
indicate
The following
error exists
Probable Cause Recommended Action