# Error LED (2)

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This LED indicates EtherCAT communication errors etc.

LED State | Indication | Description
Off | No error | No error (or no power)
Red, blinking | Invalid configuration | State change received from master is not possible due to invalid register or object settings.
Red, single flash | Unsolicited state change | Slave device application has changed the EtherCAT state autonomously; parameter ‘Change’ in the AL status register is set to 01h (change/error).
Red, double flash | Application watchdog timeout | Sync manager watchdog timeout
Red a) | Application controller is not responding any more | EXCEPTION state

a) If RUN and ERR turns red, this indicates a fatal event, forcing the bus interface to a physically passive state.