
Programmable Field Bus Controller 750-833 • 117
LED Signaling
WAGO-I/O-SYSTEM 750
Bus System
Fault
Argument
Fault Description Remedy
Fault Code 9: CPU Exception Fault
1 Invalid device
instruction
A failure occurs in the program flow. Get in
contact with WAGO support.
2 Stack overflow A failure occurs in the program flow. Get in
contact with WAGO support.
3 Stack underflow A failure occurs in the program flow. Get in
contact with WAGO support.
4 Invalid event (NMI) A failure occurs in the program flow. Get in
contact with WAGO support.
Fault Code 10: PLC Program Processing Fault
1 Invalid offset address for
digital inputs
Correct the offset address in the related function
block.
2 Invalid offset address for
digital outputs
Correct the offset address in the related function
block.
* The number of blink pulses (n) indicates the position of the I/O module. I/O modules
without data are not counted (e.g. supply module without diagnostics).
Example: The 13
th
I/O module has been removed.
1. The I/O-LED generates a fault display with the first blink sequence (approx. 10 Hz).
2. The first pause is followed by the second blink sequence (approx. 1 Hz). The
I/O-LED blinks four times and thus signals the fault code 4 (internal bus data fault).
3. The third blink sequence follows the second pause. The I/O-LED blinks twelve times.
The fault argument 12 means that the internal bus is interrupted after the 12
th
I/O
module.
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