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Supervisory control and data acquisition (SCADA) is a system for remote monitoring and control that operates with coded signals over communication channels (using typically one communication channel per remote station).
Data is transmitted from the PLCs and other devices to a computer-based-SCADA node located at each substation. One or more computers are located at different centralized control and monitoring points. SCADA system usage have became popular from the 1960s with the increase in need of monitoring and controlling the equipment.