EL6821 - LEDs

LED	Color	Meaning
RUN	Green	This LED indicates the terminal's operating state:
		Off	State of the EtherCAT State Machine: INIT = initialization of the terminal or BOOTSTRAP = function for terminal firmware updates
		Flashing	State of the EtherCAT State Machine: PREOP = function for mailbox communication and different default settings set
		Single flash	State of the EtherCAT State Machine: SAFEOP = verification of the Sync Manager channels and the distributed clocks. Outputs remain in safe state.
		On	State of the EtherCAT State Machine: OP = normal operating state; mailbox and process data communication is possible
Send	green	flashes	A DALI telegram is sent every time the light came on.
+24 V Power	green	off	No 24 V_DC power supply at contact 1 and 5
+24 V Power	green	on	24 V_DC power supply at contact 1 and 5 okay
Input 1	green	off	The digital input "Input 1" is switched off.
Input 1	green	on	Digital input “Input 1” is switched on or was active and has not yet been acknowledged.
Error	red	on	No 24 V_DC power supply at contact 1 and 5 or hardware error
Receive	green	flashes	A DALI telegram was received each time the light came on.
DALI Power	green	off	The integrated DALI power supply is switched off.
DALI Power	green	on	The terminal supplies the DALI bus with power.
Input 2	green	off	The digital input "Input 2" is switched off.
Input 2	green	on	The digital input “Input 2” is switched on or was active and has not yet been acknowledged.
The status of the LEDs can also be read via CoE object 0xF915 (see chapter EL6821 - Device diagnostic functions).