3 PLC and SCADA PC

Hi,

Sorry if I asked this question on the wrong forum

I have 3 PLC which are placed in different sites and PC where the SCADA and OPC (Kepware) is installed

All PLC are having Ethernet port

I'm using Modbus TCP/IP to achieve data collection. As to get these data my 3 PLC and my PC should be in the same IP network?

Can anyone have a solution for this? How can I make the 4 in the same network?

Regards

Amal