State LEDs

LED	State	Color	LED = OFF	LED = ON	LED flashes
PWR	Process voltage 24 VDC via terminal and process voltage via I/O bus	Green	CPU module voltage or external 24 V DC supply voltage is missing	I/O bus voltage and external 24 V DC supply voltage are present (LED is on after startup of the module (approx. 1 s))	—
ERR	Channel or module error	Red	No error or process voltage is missing	Serious error in the module	Axis related error
P0…P3	Pulse output	Yellow	Output = OFF	Output = ON	LED follows the state of the outputs, depending on frequency
I0…I3	Digital Input	Yellow	Input = OFF	Input = ON	—
O0…O1	Reserved	Yellow	—	—	—