Controller Connection Issue or Validator Not Complete
Allen-Bradley · Compact 5000 Digital I/O Modules
What does MOD Indicator Flashing Green mean?
The Module Status Indicator (MOD) flashes green when there is no established connection between the module and its owner-controller. For Compact 5000 safety I/O modules, this can also mean the Validator has not completed an initial Time Coordination exchange.
Common Causes
- Missing, incomplete, or incorrect module configuration in Studio 5000 Logix Designer.
- Controller communication fault or the controller is not in Run mode.
- For Compact 5000 safety I/O modules, the initial Time Coordination exchange with the controller's Validator has failed or is incomplete.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Access the Studio 5000 Logix Designer project to examine the module's configuration and connection status.
- 2
Correct any missing, incomplete, or incorrect module configuration settings within the Studio 5000 Logix Designer project and download to the controller.
- 3
Verify the controller is in Run mode and actively communicating with the module.
- 4
For safety modules, verify the Time Coordination settings and status in Studio 5000 Logix Designer, ensuring the Validator process can complete.