Hi
I want to connect two premium plc's over mb+ (only because the distance between them is >250m and therefore can't use ethernet) and access both of them trough an Ethernet connection in one of them.

Is it possible to access both of the cpus either to program and hmi?

 

There are "Ethernet extenders" which operate over copper or optic fiber to allow longer range on Ethernet. I can't recommend a particular model, but you can find lots of information on these if you do a Google search.