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<p><span> What is the best solution for an industrial network containing SCADA, OPC servers and PLC’s. Should I use a Domain or just place the servers into a workgroup?</span></p>
just place the servers into a workgroup, because Scada specializes in the compelling visualization of real-time data and has produced exceptional data visualization solutions for manufacturing, power & utilities, automation
its better to have Modbus TCP over IP with Ethernet Media. For opc like Kepware u can use, Modbus tcp module can be use at plc end or if plc(like compact logix) if u have ethernet port than no need modbus too. use only ethernet. that it.