Fault
Argument Fault Description Remedy Fault Code 1: Hardware and Configuration Fault
- Check sum fault in
parameter area of the flash memory.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
1 Overflow of the internal buffer memory for the inline code.
Switch off the supply voltage of the node. Reduce the number of modules and switch on the supply voltage again. In case that the fault still exists, replace the coupler.
2 Unknown data type Detect faulty I/O module as follows: turn off the power supply. Place the end module in the middle of the field bus node. Turn the power supply on again.
- If the LED is still blinking, turn off the power supply and place the end module in the middle of the first half of the node (towards the coupler). - If the LED doesn't blink, turn off the power supply and place the end module in the middle of the second half of the node (away from the coupler). Turn the power supply on again. Repeat this procedure until the faulty I/O module is detected. Replace the faulty I/O module. Ask about a firmware update for the field bus coupler.
3 Module type of the flash program memory could not be determined / is incorrect.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
4 Fault during writing in the flash memory.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
5 Fault when deleting the FLASH memory.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
6 Changed I/O module
configuration found after AUTORESET.
Restart the coupler by switching the supply voltage off and on again.
7 Fault when writing in the serial EEPROM.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
Fault Argument
Fault Description Remedy
8 Invalid hardware-
firmware combination. Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
9 Invalid check sum in the serial EEPROM.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
10 Fault when initializing
the serial EEPROM. Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
11 Fault when reading the serial EEPROM.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
12 Exceeded time when
accessing the serial EEPROM.
Switch off the supply voltage of the node. Replace the coupler and switch on the supply voltage again.
14 Maximum number of
gateway modules or mailbox modules exceeded.
Reduce the number of correspondent modules up to a valid number.
Fault Code 2: not used
- - -
Fault Code 3: Internal Bus Protocol Fault
- Internal bus
communication defective, incorrect module not identifiable.
If the field bus node comprises internal system supply module (750-613), make sure first that the power supply of these modules is functioning. This is indicated by the status LEDs. If all I/O modules are connected correctly or if the field bus node does not comprise 750-613 module you can detect the faulty I/O module as follows:
turn off the power supply of the node. Place the end module in the middle of the field bus node. Turn the power supply on again.
- If the LED is still blinking, turn off the power supply and place the end module in the middle of the first half of the node (towards the coupler). - If the LED doesn't blink, turn off the power supply and place the end module in the middle of the second half of the node (away from the coupler). Turn the power supply on again. Repeat this procedure until the faulty I/O module is detected. Replace the faulty I/O module.
If there is only one module on the coupler and the LED is blinking, either this module or the coupler
LED Signaling
WAGO-I/O-SYSTEM 750
Bus System
Fault Argument
Fault Description Remedy Fault Code 4: Physical Internal Bus Fault
- Data fault on internal bus or
internal bus interruption on coupler.
Switch off the supply voltage of the node. Place an I/O module with process data behind the coupler and note the error argument after the power supply is turned on. If none error argument is given by the I/O LED, replace the coupler. Otherwise detect faulty I/O module as follows: turn off the power supply. Place the end module in the middle of the field bus node. Turn the power supply on again.
- If the LED is still blinking, turn off the power supply and place the end module in the middle of the first half of the node (towards the coupler). - If the LED doesn't blink, turn off the power supply and place the end module in the middle of the second half of the node (away from the coupler). Turn the power supply on again. Repeat this procedure until the faulty I/O module is detected. Replace the faulty I/O module.
If there is only one module on the coupler and the LED is blinking, either this module or the coupler is defective. Replace the defective component. n* Internal bus interrupted
after I/O module n with process data.
Switch off the supply voltage of the node. Replace the (n+1)th module with process data and
switch on the supply voltage again. Fault Code 5: Initialization Fault
n* Register communication
fault during internal bus initialization.
Switch off the supply voltage of the node. Replace the nth module with process data and
switch on the supply voltage again. Fault Code 6: not used
- - -
Fault Code 7: not used
- - -
Fault Code 8: not used
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 13th 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 12th I/O
LED Signaling
WAGO-I/O-SYSTEM 750
Bus System