Explain how SCADA uses remote terminal units (RTUs).
What will be an ideal response?
In general, a SCADA system is going to be a DCS using servers, HMIs, sensors, and actuators. The big difference is the replacement of controllers with devices called remote terminal units (RTUs). RTUs provide the same function as a controller but have two major differences. First, an RTU is designed to have some amount of autonomy in case it loses connection with the central control. Second, an RTU is designed to take advantage of some form of long-distance communication such as telephony, fiber optic, or cellular WANs.
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