LED Description

For the PROFINET IO Controller protocol, the system status LED SYS, communication LED SF (System Failure), BF (Bus Failure), ethernet LED Link or RX/TX can assume the states described below.

SYS	SF	BF	Meaning
System status Yellow/green	System Failure COM0 red/green	Bus Failure COM1 red/green	LED name General LED name Colors of the SYS and SF LEDs, or of BF
Firmware and Configuration
OFF	OFF	OFF	The power supply to the device is missing or hardware may have faults.
On, yellow	OFF	OFF	No second stage bootloader found in Flash memory.
Blinking Green/yellow, cyclic	OFF	OFF	No firmware file found in Flash file system.
On, green	On, red	OFF	PROFINET IO Controller is not configured
On, green	OFF	On, red	No Ethernet port has a link. E.g., no cable is connected to any of the Ethernet ports.
On, green	OFF	Flashing, red, 2Hz	PROFINET IO Controller is not online (the bus is turned OFF).
PROFINET communication
On, green	Light OFF or On, red	Flashing, red, 1Hz	Not all configured devices are in data exchange.
On, green	On, red	-	One IO Device connected to the PROFINET IO Controller reports a problem.
On, green	OFF	Light OFF	All configured devices are in data exchange. No problem has been reported by any device.
PROFINET IO Controller operation
On, green	Flashing, red, 1 Hz, 3s	Light OFF	PROFINET DCP Set Signal has been received.
On, green	Flashing, red, 2Hz	Flashing, red, 2Hz	The PROFINET IO Controller has detected an address conflict. Another device in the network is using the same Station name or IP address as the PROFINET IO Controller. This could also be a Watchdog error.
On, green	On, red	On, red	No valid Master license

LED	Color	State	Meaning
LINK Ch0 & Ch1	LED green
	Green	ON	The device is linked to the Ethernet.
	Light OFF	OFF	The device has no link to the Ethernet.
RX/TX Ch0 & Ch1	LED yellow
	Yellow	Flickering (load dependent)	The device sends/receives Ethernet frames.
	Light OFF	OFF	The device does not send/receive Ethernet frames.

LED state	Description
Blinking (1 Hz, 3 s)	The indicator turns on and off for 3 seconds with a frequency of 1 Hz: "on" for 500 ms, followed by "off" for 500 ms.
Blinking (1 Hz)	The indicator turns on and off with a frequency of 1 Hz: "on" for 500 ms, followed by "off" for 500 ms.
Blinking (2 Hz)	The indicator turns on and off with a frequency of 2 Hz: "on" for 250 ms, followed by "off" for 250 ms.
Flickering (load dependent)	The indicator turns on and off with a frequency of approximately 10 Hz to indicate high Ethernet activity: "on" for approximately 50 ms, followed by "off" for 50 ms. The indicator turns on and off at irregular intervals to indicate low Ethernet activity.