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Human-machine interface (HMI)

A human-machine interface (HMI) is an electronic interface arrangement, generally provided with display and keyboard, which is accessible to the user. An HMI device provides functions enhancing the comfort, quality and safety of an operator's control, e.g., an overview of the equipment to be operated and error-free operator actions. An HMI allows the user to program the functions of the digital process control device, using predefined hardware buttons that allow accessing to suitable software menus. Operating devices and HMI units with the aid of which the controllers can be operated in a user-friendly fashion are frequently provided, not only in the case of complex controllers. The HMI units serve in this case for visualizing and setting relevant control variables. HMI devices can be used not only to visualize and control interactive process images of the technical installation to be controlled but also to configure and generate them. Static human-machine interface (HMI) devices and methods are generally used in numerous applications, including automotive applications. These static HMI devices and methods rely on a hard-programmed display, which is directly and inseparably linked to the application programs that operate the display.

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