ABC X-CPU-2 CPs (ETH1…ETH4) must be in different subnets

The X-CPU-2 has four independent CPs (ETH1…ETH4), that are responsible for communication and visualization.

The four internal CPs (ETH1…ETH4) must be logically in different subnets.

eG.: The following configuration is among others inadmissible. 

or:

 

Such settings lead to connection problems with the ABC X-CPU-2