EL6751 – LED description

LED behavior

The most important states of the terminal can be quickly diagnosed on the basis of the 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; BOOTSTRAP = function for terminal firmware updates
		Flashes at 2 Hz	State of the EtherCAT State Machine: PREOP = function for mailbox communication and different standard-settings set
		Flashes at 1 Hz	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
Err	red	off	All configured bus devices are error-free (box state = 0); TwinCAT task or process is running.
		Flashes at 1 Hz	At least one box state is not equal to 0 (e.g. device not found, wrong configuration, device in error state)
		Flashes at 10 Hz	Configuration upload being carried out
		on	CAN controller is BUS OFF. Physical CAN problem. Possible causes: e.g. missing termination resistor, bus line too long, wrong baud rate, node address assigned twice, wiring error, short-circuit. Restart required
CPU error	red	on	EL6751 processor error
CPU error	red	Flashes at 10 Hz	The EL6751 processor starts