Of course, no one at Pro-face has bothered to develop a special driver for Phoenix Contact. Not yet, anyway.
Therefore, you would have to go with communications using one of the 'open' protocols. Modbus TCP has already been suggested and it is a good choice. On GP-Pro side, you would have to select 'Schneider Electric' and then 'Modbus TCP'.
How to do it on Phoenix side, I am not sure. A quick look at the manual on their site suggest that by default the Ethernet port on the PLC is not configured for any specific protocol - so, in order to use Modbus TCP, there must be a special software library for that.
If it exists, it is likely a separate purchase. Contact your Phoenix vendor to discuss options.