LED Status Display

The LEDs are located at the front of module. There are 4 different groups:

• 5 system LEDs (PWR, STA1 ETH, STA2 ETH, S-ERR and I/O-Bus) show the operation status of the module and display possible errors.
• 4 ETHERNET status LEDs located at the Terminal Unit TU520-ETH
• 11 status LEDs for the Serial Interfaces an the CANOPEN Interface
• 1 LED to display the presence of the process supply voltage UP

Status of the 5 System-LEDs

LED	Color	OFF	ON	Flashing
PWR/RUN	Green	Process supply voltage missing	Internal supply voltage OK, module ready for communication with IO Controller	Start-up / preparing communication
	Yellow	—	—	—
STA1 ETH (System-LED “BF”)	Green	—	Device configured, cyclic data exchange running	—
	Red	—	—	Device is not configured
STA2 ETH (System-LED “SF”)	Green	—	—	Got identification request from IO Controller
	Red	No system error	System error (collective error)	—
S-ERR	Red	No error	Internal error	–
I/O-Bus	Green	No expansion modules connected or communication error	Expansion modules connected and operational	—

Status of \ the 4 ETHERNET Status LEDs

LED	Color	OFF	ON	Flashing
ETH1-Link	Green	No connection at ETHERNET interface	Connected to ETHERNET interface	—
ETH1-Rx Tx	Yellow	—	Device is transmitting telegrams	Device is transmitting telegrams
ETH2-Link	Green	No connection at ETHERNET interface	Connected to ETHERNET interface	—
Eth2-Rx Tx	Yellow	—	Device is transmitting telegrams	Device is transmitting telegrams

Status of the 8 status LEDs (4 per channel) \ of the Serial Interfaces

LED	Color	OFF	ON	Flashing
COMx TxD	Yellow	No data transmission over serial network	–	Channel is transmitting data via the serial interface (flashing rate depending on the telegram transmission frequency)
COMx RxD	Yellow	No data reception from serial network	–	Channel is receiving data from the serial interface (flashing rate depending on the telegram reception frequency)
COMx STA	Yellow	RS-232: RTS signal not active RS-485: Channel is in reception mode RS-422:Channel is not enabled	RS-232: RTS signal is active RS-485: Channel is transmitting RS-422: Channel is enabled (able to receive and transmit)	–
COMx-ERR	Red	Channel enabled, no error or Channel deactivated	Channel boot up	Channel error (receive buffer overflow)

Status of the 3 status LEDs of the CANOPEN Interfaces

LED	Color	OFF	ON	Flashing
CAN-RUN	Yellow	–	Device configured, CANOPEN Bus in OPERATIONAL state and cyclic data exchange running	Flashing cyclically: CANOPEN Bus in Pre-operational state and slave is being configured Single flash: CANOPEN Bus in Stopped state.
CAN-STA	Yellow	No data transmission	Channel is transmitting data	–
CAN-ERR	Red	No error	CANOPEN bus is OFF	Flashing cyclically: Configuration error Single flash: Error counter overflow due to too many error frames Double flash: A Node-Guard or a Heartbeat event occurred

Status of the power supply LED

LED	Color	OFF	ON	Flashing
UP	Green	No process voltage available	Process voltage available	–