User manual

Publication 1768-UM001C-EN-P - November 2007
120 Status Indicators
PWR Steady red The power supply cannot produce valid
24V power to the 1768 modules.
To supply 24V power, perform this procedure.
1. Disconnect all modules from the system.
2. Reapply power.
3. Check the PWR status indicator.
a. If the status indicator remains red, replace the power supply.
b. If the status indicator is green, one of the other modules in
the system is causing the red indicator. Move to the next
step.
4. Reinstall any 1768 motion or communication modules.
5. Reapply power.
a. If the status indicator is green, either the 1768 controller or
one of the 1769 I/O modules is causing the red indicator.
b. If the status indicator remains red, one of the 1768
communication or motion modules is causing the red
indicator. Move to the next step.
6. Disconnect the 1768 communication or motion modules from
the system one at a time.
7. After each module is removed from the system, reapply power
to the power supply and check the PWR status indicator.
a. If the status indicator is green, the most recently removed
1768 module caused the red indicator and should be
replaced.
b. If the status indicator remains red, continue disconnecting
1768 modules one at a time until the PWR status indicator
turns green.
CompactLogix Controller Status Indicators
Indicator Condition Interpretation Recommended Actions