Technical data
128 •  BACnet/IP Controller 750-830 
 LED Signaling 
 WAGO-I/O-SYSTEM 750 
BACnet/IP Controller 
"I/O" LED Error Messages as Blinking Sequences 
Error messages are indicated by three consecutive blinking sequences. 
 1  2 3 
Initiation of error indication –Pause– Error code –Pause– Error argument 
Tab. 3-25: Error messages as blinking sequences – Error codes 1 through 11 
Error code 1: "Hardware and configuration error" 
Error 
argument 
Error description  Solution 
1  Overflow of the inter-
nal buffer memory for 
the inline code. 
1. Switch off the power for the node. 
2. Reduce the number of bus modules 
3. Turn on the power supply again. 
4. If the error remains, replace the bus coupler. 
2  Bus module(s) with 
unknown data type 
1. Identify the faulty bus module. Turn off the power 
 supply. 
2. Plug the end module into the middle of the node 
 and switch the power back on. 
3. LED continues to flash? 
 Switch off the power and plug the end module into 
 the middle of the first half of the node (toward the 
 controller). 
 LED not flashing? 
 Switch off the power and plug the end module into 
 the middle of the second half of the node (away 
 from controller). 
4. Turn on the power supply again. Repeat this 
 procedure (while halving the step size) until the 
 faulty bus module is detected. 
5. Replace the faulty bus module. Inquire about a 
 firmware update for the bus coupler. 
3  Invalid check sum in 
the parameter area of 
the bus coupler. 
1. Switch off the power for the node. 
2. Replace the bus coupler and switch the power on 
 again. 
4  Fault when writing in 
the serial EEPROM. 
1. Switch off power for the node. 
2. Replace the bus coupler and switch the power on 
 again. 
5  Fault when reading the 
serial EEPROM 
1. Switch off power for the node. 
2. Replace the bus coupler and switch the power on 
 again. 
6  Changed bus module 
configuration found 
after AUTORESET. 
1. Restart the coupler by turning the supply voltage 
 off and on again. 










