LED Status Displays

The PROFIBUS® status is shown by status LEDs.

Position and function of LEDs.

LED	Color	Status	Meaning
PWR	green	ON (light)	Power supply available.
		OFF (dark)	Power supply not available or defective hardware.
RDY	yellow	ON	Boot procedure
		Blinking	Boot failure
		OFF	—
RUN	green	ON	Communication module is operational
		Blinking	—
		OFF	Communication module is not operational
STA	green	ON	Communication to all Slaves is established.
		Flashes cyclic	—
		Flashes non-cyclic	No configuration or stack error
		OFF	No communication
ERR	red	ON	Communication to one/all Slaves is disconnected.
		Flashes cyclic	Communication to at least one Slave is disaconnected.
		OFF	No error