Hello, thanks for help!
So, it works well. Just to sum up:
OpcDACom:
DisableSubscription: False
OPCServer:EH_Wetzer.OPC_DA_Server.4
OPCServerPath: opcda://localhost
DataSubscriber:
PLCAddressValue: Unit_1.Channel_1.Unit_1-VT_R4
Hope it will be useful fo others...