We will have to migrate from integrated OP270 in Step7 project to a KP700 Comfort. In the configuration, there is PLC connection that use routing via a PLC (HMI is on DP of the product line PLC, the watersystem PLC is connected to the line PLC via MPI port.) How to reproduce that in TIA Portal?

We will keep the project in step7 for the PLC. The HMI will be in Tia Portal. I would appreciate suggestions for the migration process. I suppose I will have to migrate to WinCC flexible first (HMI standalone instead of integrated). I need to recreate the connection the the watersystem PLC at the end in TIA Portal. 

Here is a snapshot of the connection:

Best regards

BabyCan