PLC S7 300 expert and WinCC Explorer Modification SCADA

I need an expert in WinCC explorer and PLC s7 300, I am using WinCC v7.4, STEP7 v5.7. I have the sources of the SCADA project that communicates with PLC S7 400 and has its processes, the idea is to add one more page to SCADA, to communicate with a PLC s7 300 by TCP IP, to automate an additional process of a filter by press.