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
• 12 status LEDs for the Serial Interfaces
• 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 12 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 power supply LED:

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