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RTU stands for Remote Terminal Unit, sometimes also called Remote Telemetry Unit or Remote Telecontrol Unit. An RTU is a microprocessor-based device that monitors and controls field devices, that then connects to plant control or SCADA (supervisory control and data acquisition) systems.
If you do a search on the definition of an RTU, you may find many results that state an RTU is much more powerful than a PLC as the RTU can have several inputs and outputs.
Well, as you know, so can the PLC. The RTU does have some potential benefits over the PLC, which we will discuss.
On the price point, the winner right now is the PLC. PLCs have a lower price point but many consider the RTU to be a much more rugged system which would lead you to believe that spending more initially will equal out in the end.
As far as process control, the RTU is probably on equal ground with the PLC. Both controllers can have multiple different types of I/O, different communications modules, and programming of processes that may require little to no operator intervention. Where the RTU is considered to have some advantages is in environment tolerances, backup power options, and autonomy.
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