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The hardware or software through which an operator interacts with a controller. An HMI can range from a physical control panel with buttons and indicator lights to an industrial PC with a color graphics display running dedicated HMI softwarecommon Human Machine Interface devices that we encounter in our daily lives include touchscreens and keyboards. HMIs utilized in the industrial context are mostly screens or touchscreens that connect users to machines, systems or devices.Human machine interfaces (HMIs) are used as an operator control panel to PLCs, RTUs, and in some cases directly to IEDs. HMIs replace manually activated switches, dials, and other controls with graphical representations of the control process and digital controls to influence that process.