Report Unistream PLC with remote I/O in ...I have a project...what hardware do I need? Posted August 5, 2020 Thanks for reply, Joe, The thing is we need a solution without protocol (such as Modbus that requires additional programming) between one end and another i.e. instead of control cables that goes let's say from push button to contactor, we want to solve that with remote I/O modules like we have direct connection (connect push button to PLC I/O and contactor to remote I/O). If i'm right URB-TCP and EX-RC1 allows that. If you suggest ethernet (URB-TCP) I think we'll stick to that solution. Thank you!