SCADA (supervisory control and data acquisition) is a system for remote monitoring and controlling that operates with coded signals over communication channels (using typically one communication channel per remote station). The major function of SCADA is for acquiring data from remote devices such as valves, pumps, transmitters etc. and providing overall control remotely from a SCADA Host software platform.
The overall structure of a SCADA system, consists of four distinct levels;
Basically, traditional devices such as; pumps, valves, transmitters fitted with feedback sensors provides information of these devices into a local PLC or RTU, to relay data to the SCADA host software via a communication network.