WAGO-I/O-SYSTEM 750
Diagnostics 121
750-806 Fieldbus Controller DeviceNet
TM
Manual
Version 2.0.0
Table 48: 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
controller
1. Turn off the power supply to the node.
2. Plug in an end module behind the fieldbus controller.
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 controller.
- 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
controller).
- 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 controller).
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 controller
and the LED is flashing, either the I/O module or fieldbus
controller is defective.
13. Replace the defective component.
n*
Interruption of the
internal data bus
behind the nth bus
module with process
data, the maximum
supported number is
reached, the
following modules
are no longer
supported.
1. Turn off the power supply of the node.
2. Reduce number of I/O modules.
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 49: 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)
