Rockwell Automation 1768-L45S Compact GuardLogix Controllers - Manual (Page 122)

122 Rockwell Automation Publication 1768-UM002C-EN-P - April 2012
Appendix A Status Indicators
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.