WAGO 750-370 Manual page 123

Error code 2 -not used-
Fault Argument
Error code 3 "Protocol error internal bus"
Fault Argument
WAGO-I/O-SYSTEM 750
PROFINET IO
Fault Description
- Not used
Fault Description
- Internal bus communication is
faulty, defective component
cannot be identified.
PROFINET IO 750-370
LED Indication
Remedy
-
Remedy
If there are passive power supply
modules (750-613) in the node,
check first if these modules are
supplied correctly with power. To
do so, check the status LEDs. If all
modules are connected correctly or
if there are no 750-613 I/O
modules in the node, identify the
faulty I/O module as follows: Turn
off the supply voltage of the node.
Plug the end module in the middle
of the node. Turn on the power
supply again.
- If the LED keeps blinking, turn
off the power supply and plug the
end module in the middle of the
first half of the node (towards the
coupler).
- If the LED does not blink, turn
off the power supply and plug the
end module in the middle of the
second half of the node (away
from the coupler).
Turn on the power supply again.
Repeat this procedure (while
halving the step size) until the
faulty I/O module is detected.
Replace the faulty I/O module. If
there is only one I/O module left
and the LED blinks, then either
this module or the coupler is
defective. Replace the faulty
component.
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