Hey All,

I am quite new in architecture for Scada system and want to ask for some help.
The system basically consist of 50 PLC devices , choose 1214c with OPC server. For Scada system  V7.5 or V8 WinCC, withWinCC/Web Navigatorin order to have Web Base access for few clients on the same network.
 I was thinking on this two directions

1) Case of considering conections via to S7 the WinCC has a limit of 8 TCP connections per RJ45 port (Version V7, but need to check for newer ones), or a separate software IE Sofnet has to be used to raise them to 64. Or use more IP addresses.

2) Case of  OPC UA and using an OPC server either from Siemens or KepServerEX for example 

So all the data from each PLC is sent to OPC UA Server on a virtual machine partition, and on the same partition to run WinCC Server +Web Navigator , and have another 5 windows client connected to the Static IP of the server. 
Do I need more than one IP address in this case for communication and later for client connection for runtime ? 

Or Can anyone suggest a proper architecture?

Please treat my post as a new guy in this field as I have a lot of knowledge for testing but almost none in OPC UA networking and servers.Thanks