WAGO-I/O-System 750
Diagnostics 123
750-370 PROFINET IO Fieldbus Coupler
Manual
Version 2.0.0
Table 58: Blink Code Table for the I/O LED Signaling, Error Code 4
Error code 4: “Physical error, internal bus”
Error
Argument
Error Description Solution
-
Internal bus data
transmission error or
interruption of the
internal data bus at
the fieldbus coupler
1. Turn off the power supply to the node.
2. Plug the end module behind the fieldbus coupler.
3. Turn the power supply on.
4. Observe the error argument signaled.
- Is no error argument indicated by the I/O LED? -
5. Replace the fieldbus coupler.
- Is an error argument indicated by the I/O LED? -
5. Identify the faulty I/O module by turning off the power
supply.
6. Plug the end module into the middle of the node.
7. Turn the power supply on again.
8. - LED continues to flash? -
Turn off the power and plug the end module into the
middle of the first half of the node (toward the fieldbus
coupler).
- LED not flashing? -
Turn off the power and plug the end module into the
middle of the second half of the node (away from the
fieldbus coupler).
9. Turn the power supply on again.
10. Repeat the procedure described in step 6 while halving
the step size until the faulty I/O module is detected.
11. Replace the faulty I/O module.
12. If there is only one I/O module on the fieldbus coupler
and the LED is flashing, either the I/O module or fieldbus
coupler is defective. Replace the I/O module with a
pretested, properly functioning I/O module. If the LED
no longer flashes, the replaced I/O module was faulty.
Replace this I/O module.
13. If the LED continues to flash, the fieldbus coupler is
faulty. Replace the fieldbus coupler.
n*
Interruption of the
internal data bus
behind the nth I/O
module with process
data
1. Turn off the power supply to the node.
2. Replace the (n+1) I/O module containing process data.
3. Turn the power supply on.
* The number of light pulses (n) indicates the position of the I/O module.
I/O modules without data are not counted (e.g., supply modules without diagnostics)
Table 59: Blink Code Table for the I/O LED Signaling, Error Code 5
Error code 5: “Initialization error, internal bus”
Error
Argument
Error Description Solution
n*
Error in register
communication
during internal bus
initialization
1. Turn off the power supply to the node.
2. Replace the (n+1) I/O module containing process data.
3. Turn the power supply on.
* The number of light pulses (n) indicates the position of the I/O module.
I/O modules without data are not counted (e.g., supply modules without diagnostics)
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