PROFINET Controller has 
detected a duplicate IP 
Address on the network. 
The location associated 
with the fault will indicate 
whether the duplication is 
with the PROFINET 
Controller itself, or with a 
configured PROFINET 
Device. 
Either remove the device on the 
network that has the duplicate IP 
Address, or assign a new IP Address 
to either the PROFINET Controller or 
the conflicting device.  
Note: The Fault Extra Data displays 
the MAC addresses of the conflicting 
devices in the MAC 1 field (bytes 8–
13) and the MAC 2 field (bytes 14–19). 
If the PROFINET Controller is one of 
the devices with a conflicting IP 
Address, MAC 1 will be 0. This data is 
stored in Big Endian (most significant 
byte in lowest address) format. 
Also, if the conflict is between 
PROFINET devices on the network, 
the DCP Tool can be used to help find 
the conflict. Sorting by IP Address 
within the tool may make it easier to 
identify the duplicates. 
PROFINET Controller has 
detected that a previously 
duplicated IP Address 
conflict has been resolved. 
The location associated 
with the fault will indicate 
whether the duplication 
was with the PROFINET 
Controller itself, or with a 
configured PROFINET 
Device.