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If you need a stand-alone controller with power for your application, a PLC is likely your best choice. But be aware that some level of programming skills will be required. If you need a device to control multiple processes, without direct intervention from a controller or master, an RTU can provide many of the advanced control functions needed, as it is basically a direct interface between the field sensors, actuators and a central control unit.
programmable logic controller (PLC) is much cheaper and more flexible with programming. PLCs have been replacing RTUs because they are also easier to troubleshoot and have more sophisticated controls than RTUs.
I guess because of the difference in programming. PLC are digital and can have multiple inputs and outputs. While RTUs need SCADA, not preferable.
RTU considered better when you need to control from distance or wireless.
