Even distributed or networked SCADA systems are still not web applications. Which means that the vast majority of SCADA systems are desktop applications, or fat clients of sorts. In most cases, the hardware where the application runs is directly connected to the controllers, allowing the software to communicate with the devices in real time. Traditionally SCADA systems have always been built using C/C++ with either a text UI or graphical UI, and more recently using C# WinForms/WPF (or Java Swing or AWT). These systems can be as simple as turning a pump on or off and as complicated as monitoring or programming an entire manufacturing plant. Usually, it refers to software systems with a UI that are connected to manufacturing machines, sensors, or any kind of controller. It is used to describe applications that monitor and control external devices. SCADA stands for Supervisory Control and Data Acquisition.
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