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3.1.11.2
Node Status – Blink code from the 'I/O' LED
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
I/O
Green
Off
Red
Red
The controller 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.
Detailed fault messages are displayed with the aid of a blink code. A fault is
cyclically displayed with up to 3 blink sequences.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Meaning
Fieldbus controller operating perfectly, Data cycle on
the internal bus
No data cycle on the internal bus
a) During startup of fieldbus controller:
Internal bus being initialized,
Startup displayed by LED flashing fast for approx.
1-2 seconds
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 flash.
• The first blink sequence (approx. 10 Hz) starts the fault display.
• The second blink sequence (approx. 1 Hz) following a pause. The
number of blink pulses indicates the fault code.
• The third blink sequence (approx. 1 Hz) follows after a further pause.
The number of blink pulses indicates the fault argument.
Fieldbus Controller
Fieldbus Controller 750-872/020-000
Trouble shooting
Evaluate the fault message (fault code and
fault argument).
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