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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. A telemetry system is typically used to connect PLCs and RTUs with control centers, data warehouses, and the enterprise. 2  Examples of wired telemetry media used in SCADA systems include leased telephone lines and WAN circuits.