User manual

196 Rockwell Automation Publication 1756-UM001O-EN-P - October 2014
Appendix A Troubleshoot the Module
OK Indicator
The OK indicator shows the state of the controller.
1756-L6x Status Indicators
The 1756-L6x controllers have status indicators on the front of the controller
that show the state of the controller.
RUN Indicator
Use the mode switch on the front of the controller or use the Controller Status
menu in the Logix Designer application to change the controller mode that is
shown by the RUN indicator.
Table 55 - OK Indicator
State Description
Off No power is applied to the controller.
Flashing red Either of the following is true:
• It is a new controller, out of the box, and it requires a firmware upgrade. If a firmware
upgrade is required, the status display indicates Firmware Installation Required. To upgrade
firmware, see Upgrade Controller Firmware
on page 52.
• It is a previously used or in-use controller and a major fault has occurred. For details about
major recoverable and nonrecoverable faults, see the Logix5000 Major, Minor, and I/O Fault
Codes Programming Manual, publication
1756-PM014 .
Solid red One of the following is true:
• The controller is completing power-up diagnostics.
• The charge of the capacitor in the ESM is being discharged upon powerdown.
• The controller is powered, but is inoperable.
• The controller is loading a project to nonvolatile memory.
Solid green The controller is operating normally.
Table 56 - RUN Indicator
State Description
Off The controller is in Program or Test mode.
Steady green The controller is in Run mode.
Status Indicators