Status Alarm (DO Ground Fault)

What does ALM LED Blink (1:3) mean?

The red ALM LED blinks with a 1:3 duty cycle (0.5s ON / 1.5s OFF), indicating a general status alarm. A common example of such a status alarm is a Digital Output (DO) ground fault.

• A status alarm, specifically a ground fault detected on a digital output (DO) channel, has been triggered.
• This indicates that a connected device or wiring on a DO output circuit is shorted to ground.
• The control system is unable to energize or de-energize the output correctly due to the ground fault.
• Requires inspection of the DO output wiring and the connected load for insulation issues.

Click steps to track your progress.

1. 1

   Identify and remove the cause of the alarm.