CompactLogix Controllers 31
Publication
1768-IN004D-EN-P - December 2009
Examine the I/O PWR Indicator
This task assumes that the power supply and controller PWR
indicators are green and that you have 1769 I/O modules in your
system.
1. If there is a 1769 power supply installed in the local bank,
remove it and reapply power.
If the I/O PWR indicator remains red, go to the next step.
2. Remove power and wait for all status indicators to turn off.
3. Disconnect the 1769 I/O modules from the system.
4. Reapply power.
5. Check the controller I/O PWR indicator.
a. If the indicator is red, replace the controller.
b. If the indicator is green, one of the 1769 I/O modules is
causing the red indicator.
To troubleshoot 1769 I/O modules, see their respective
installation instructions.
Controller I/O PWR
Indicator Status
(1)
(1) When the controller powers up, the I/O PWR status indicator is momentarily red and then changes to
green if there are no issues. If the indicator remains red, use the table above to troubleshoot the issue.
Recommended Action
Off Replace the controller.
Green The controller is operating properly. No action required.
Flashing red and green Make sure the 1769 I/O modules or end cap are properly
attached and cycle power.
Red A 1769 power supply may be installed in the local bank, or
there may be an issue with the controller or 1769 I/O in the
system. Follow the corrective action below.
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