SCADA
system for supervisory control and surveillance of an automation or control system
Supervisory control and data acquisition (SCADA) is a control system architecture comprising computers, networked data communications and graphical user interfaces for high-level supervision of machines and processes. It also covers sensors and actuators, which are monitored and controlled from programmable logic controllers, or a distributed control system (DCS), which interfaces with process plant or machinery.
The operator interfaces, which enable monitoring and the issuing of process commands, such as controller setpoint changes, are handled through the SCADA computer system. The subordinated operations, e.g. the real-time control logic or controller calculations, are performed by networked modules connected to the field sensors and actuators.
The SCADA concept was developed to be a universal means of remote access to a variety of local control modules, which could be from different manufacturers and allow access through standard automation protocols. In practice, large SCADA systems have grown to become similar to DCSs in function, while using multiple means of interfacing with the plant. They can control large-scale processes spanning multiple sites, and work over large distances. It is one of the most commonly used types of industrial control systems.
Control operations
The key attribute of a SCADA system is its ability to perform a supervisory operation over a variety of other proprietary devices.
“SCADA” enters the record as system for supervisory control and surveillance of an automation or control system. Crown Archives preserves that source wording while asking what SCADA, system and supervisory can confirm, complicate or overturn.
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“SCADA” is worth following because a concise public description often conceals a longer documentary argument. Here, SCADA, system and supervisory provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 22, 2026. The linked authority identifier is Q17498. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “SCADA” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.