An HMI Human Machine Interface is defined as a function or component of a specific device or software application that allows humans to interact with and interact with machines. HMI is becoming more and more complex. We spoke to four HMI experts who helped us explain the basics.
The HMI is used as an operator control panel for PLCs, RTUs, and in some cases, directly for IEDs. HMIs replace manually activated switches, scales, and other controls with process graphics and digital controls that affect the process.
HMIs allow operators to start and stop loops, adjust setpoints and other functions necessary to set up and interact with the control process. Because HMIs are software-based, they replace physical wires and controls with software parameters, making them easier to adapt and configure.
Although HMI is the most common term for this technology, it is sometimes referred to as Human Machine Interface (MMI), Operator Interface Terminal (OIT), Local Operator Interface (LOI). HMI and graphical user interface (GUI) are similar but not synonymous: GUIs are often used in HMIs for visualization.
HMIs used in an industrial context are screens or touch screens that connect users to machines, systems, or devices. Factory operators use HMIs to control and automate their equipment as well as production lines. HMIs can be simple on-screen displays installed on machines in the factory, modern touch screens, multi-touch control panels, buttons, computers with keyboards, or tablets.
An HMI Human Machine Interface is defined as a function or component of a specific device or software application that enables humans to interact with and interact with machines. HMI user interface or dashboard connects a person to a machine, system, or device.
The term can technically be applied to any screen that allows a user to interact with a device, Although the HMI is most commonly used in the context of an industrial process.
Examples of human-machine interface devices that we encounter in our day-to-day life include touch screens and keyboards.