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Fieldbus coupler 750-342
LED Display
Modular I/O System
ETHERNET TCP/IP
3.1.7.2 Fieldbus
status
The operating status of the communication via ETHERNET is signalled by
means of the top LED group (ON, LINK, TxD/RxD and ERROR).
LED
Meaning
Trouble shooting
ON
green
Fieldbus initialization is correct
OFF
Fieldbus initialization is not correct,
no function or self-test
Check the supply voltage (24V and 0V),
check the IP configuration
LINK
green
Link to a physical network exists
OFF
No link to a physical network
Check the fieldbus connection.
TxD/RxD
green
Data exchange taking place
OFF
No data exchange
ERROR
red
Error on the fieldbus
OFF
No error on the fieldbus, normal operation
3.1.7.3 Node
status
The operating status of the communication via the internal bus is signalled via
the bottom I/O LED.
LED
Meaning
Trouble shooting
I/O
Green
Fieldbus coupler operating perfectly
Red
a) During startup of fieldbus coupler:
Internal bus being initialized,
Startup displayed by LED flashing fast for approx.
1-2 seconds
Red
b) After startup of fieldbus coupler:
Errors, which occur, are indicated by three conse-
cutive flashing sequences. There is a short pause
between each sequential flash.
Evaluate the fault message (fault code and
fault argument).
The coupler starts up after switching on the supply voltage. The "I/O" LED
blinks. The "I/O" LED has a steady light following a fault free run-up.
In the case of a fault the "I/O" LED continues blinking. The fault is cyclically
displayed by the blink code.