Rockwell Automation 1768-L43_L45_L43S_L45S CompactLogix Controllers Installation Instructions - Manual (Page 30)

30 CompactLogix Controllers
Publication 1768-IN004D-EN-P - December 2009
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.
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.