Table 57: Blink Code Table For The I/O Led Signaling, Error Code 3; 750-370 Profinet Io Fieldbus Coupler - WAGO 750-370 Manual

122 Diagnostics

Table 57: Blink Code Table for the I/O LED Signaling, Error Code 3

Error code 3: "Protocol error, internal bus"
Error
Argument
-
Error Description Solution
- Are passive power supply modules (750-613) located in the
1. Check that these modules are supplied correctly with
2. Determine this by the state of the associated status LEDs.
- Are all modules connected correctly or are there any
1. Determine the faulty I/O module by turning off the power
2. Plug the end module into the middle of the node.
3. Turn the power supply on again.
4. - LED continues to flash? -
Internal data bus
communication is
faulty, defective
module cannot be
identified.
5. Turn the power supply on again.
6. Repeat the procedure described in step 4 while halving
7. Replace the faulty I/O module.
8. If there is only one I/O module on the fieldbus coupler
9. If the LED continues to flash, the fieldbus coupler is

750-370 PROFINET IO Fieldbus Coupler

node? -
power.
750-613 Modules in the node? -
supply.
Turn off the power supply 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).
the step size until the faulty I/O module is detected.
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.
faulty. Replace the fieldbus coupler.
WAGO-I/O-System 750
Manual
Version 2.0.0