I´m trying to connect an aplication RT WinCC 7.0 sp2, vía Industrial Ethernet, with a PLC S7-300 (314-2DP) + CP343-1 Lean programmed in Tia portal V12 SP1. The WinCC PC do ping to CP without problems, but in WinCC I see "no connection with PLC". The aplication has communication, via I.E., with several PLC in step 7 Classic.

¿How can I do this communication?

Some captures about Tia Portal Configuration.

2.Simatic Manager V5.5 Spx and (engg software)and Wincc Professional V12(Scada Software)

In your project you have to choose correct softwars for Developement.

if you still want communication between TIA V12 and Wincc 7.0,OPC or Modbus communication is the only way(i think) i am communicated wincc 7.0 and S7 1200 Cpu via OPC and Modbus it will works.