Technical data

98 • Fieldbus Controller 750-841
LED Display
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
3.1.8.3 Node status
The ‘I/O‘-LED displays the communication status of the internal bus.
Additionally, this LED is used to display fault codes (blink codes) in the event
of a system error.
LED Meaning Trouble shooting
I/O
green Fieldbus controller operating perfectly
red a) During startup of fieldbus controller:
Internal bus being initialized,
Startup displayed by LED flashing fast for approx.
1-2 seconds
red b) After startup of fieldbus controller:
Errors, which occur, are indicated by three conse-
cutive flashing sequences. There is a short pause
between each sequential.
Evaluate the fault message (fault code and
fault argument).
During startup of the controller, the ‘I/O‘-LED blinks as the internal bus is
intialized. The LED will turn solid green after a fault free start-up.
In the case of a fault, the ‘I/O‘-LED continues flashing and displays a blink
code.
“I/O”-LED is blinking
Test o.k.?
No
Yes
“I/O”-LED is shining
ready for operation
2nd break
1st break
“I/O” LED
1st flash sequence
(Introduction of the
error indication)
“I/O” LED
2nd flash sequence
Error code
(Number of flash cycles)
“I/O” LED
3rd flash sequence
Error argument
(Number of flash cycles)
Coupler/Controller starts up
Switching on
the power supply
Fig. 3-15: Signalling of the LED for indication of the node status g012911e
After resolving the fault condition, restart the controller by cycling the power.