//create new planning object
PlanningSegment oNewPCTLoop = PlanningSegment.Create(oSegmentDefinition);

//add new PLC address
PlanningSegment.PLCAddress oNewAddress = oNewPCTLoop.AddPLCAddress();

//set values
oNewAddress.Direction = PlanningSegment.PLCAddress.Enums.PlcAddressDirection.Input;
oNewAddress.Address = "A2.0";
oNewAddress.DataType = "WORD";
oNewAddress.SymbolicAddress = "=EB3+ET1-H2:X1";
oNewAddress.Configuration = "Siemens SIMATIC S7";
oNewAddress.Station = "Station 300";