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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).
1 The historian is a client that requests data from a data acquisition server. 2  A supervisory (computer) system, gathering (acquiring) data on the process and sending commands (control) to the SCADA system. 3  Communication infrastructure connecting the supervisory system to the remote terminal units.he term SCADA (Supervisory Control and Data Acquisition) usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas (anything from an industrial plant to a nation). Most control actions are performed automatically by RTUs or by PLCs.