Rockwell Automation 1768-L45S Compact GuardLogix Controllers - Manual (Page 121)

Rockwell Automation Publication 1768-UM002C-EN-P - April 2012 121
Status Indicators Appendix A
Examine the Controller PWR Indicator
This task assumes that the power supply PWR indicator is green.
1. Remove power and wait for all status indicators to turn off.
2. Disconnect all 1768 modules from the system, except for the controller.
3. Reapply power.
4. Check the controller PWR indicator.
a. If the status indicator remains red, replace the controller.
b. If the status indicator is green, one of the 1768 modules is causing the
red indicator.
5. Remove power.
6. Reinstall the 1768 modules one at a time, removing and reapplying power
and checking the controller PWR indicator each time.
7. If the controller PWR indicator turns red, the most-recently installed
module is causing the red indicator.
To troubleshoot 1768 modules, see their respective installation
instructions.
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.
Controller PWR Indicator Status Recommended Action
Off Make sure all of the modules in the system are installed properly and are
fully engaged with one another. If the indicator remains off, follow the
corrective action below.
Green The controller is providing power to 1768 modules in the system.
Check the controller I/O PWR status indicator to make sure the entire system
is operating properly.
Red Either the controller or 1768 modules in the system need to be replaced.
Follow the corrective action below.
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.