SCADA (Supervisory Control and Data Acquisition) is not exactly a type of HMI (Human-Machine Interface), but rather a broader system that includes HMI functionality as one of its components.
While both SCADA and HMI serve to facilitate human interaction with industrial processes, they have different scopes and purposes:
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HMI (Human-Machine Interface): HMI specifically refers to the interface through which operators interact with machines or systems. HMIs provide a graphical representation of the system's status and allow users to monitor processes, control equipment, and receive feedback. They are typically localized interfaces used for direct control and monitoring at the machine or equipment level.
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SCADA (Supervisory Control and Data Acquisition): SCADA, on the other hand, is a more comprehensive system that integrates data acquisition, control, and monitoring functions across entire industrial processes or facilities. SCADA systems collect data from multiple sources, including HMIs, sensors, and other devices, and provide a centralized platform for supervisory control. While SCADA systems include HMI functionality, they also offer additional features such as data logging, historical analysis, alarming, remote access, and system-wide supervision.
In summary, while HMI refers specifically to the interface component, SCADA encompasses a broader range of functionalities beyond just HMI, making it a more comprehensive solution for industrial automation and control.
