Rather, HMI provides an effective communication tool that functions as part of, or alongside, a SCADA system. Unlike SCADA systems, HMIs do not collect and record information or connect to databases. While HMIs are focused on visually conveying information to help the user supervise an industrial process, SCADA systems have a greater capacity for data collection and control-system operation. Supervisory Control and Data Acquisition (SCADA) and HMI are closely related, and often referred to in the same context since they are both part of a larger industrial control system, but they each offer different functionality and opportunities. What is the Difference Between HMI and SCADA? By allowing PLCs to communicate real-time information straight to an HMI display, HMI technology eliminates the need for this outdated practice and thereby reduces many costly problems caused by lack of information or human error. Previously, operators would need to walk the floor constantly to review mechanical progress and record it on a piece of paper or a whiteboard. By leveraging HMI, operators can see important information displayed in graphs, charts, or digital dashboards, view and manage alarms, and connect with SCADA and MES systems, all through one console. HMIs are used to optimize an industrial process by digitizing and centralizing data for a viewer. HMI screens can be used for a single function, like monitoring and tracking, or for performing more sophisticated operations, like switching machines off or increasing production speed, depending on how they are implemented. HMIs communicate with Programmable Logic Controllers (PLCs) and input/output sensors to get and display information for users to view. HMIs are essential resources for these professionals, who use them to review and monitor processes, diagnose problems, and visualize data. The most common roles that interact with HMIs are operators, system integrators, and engineers, particularly control system engineers. HMI technology is used by almost all industrial organizations, as well as a wide range of other companies, to interact with their machines and optimize their industrial processes. This screen visualizes gas information for a meter, and monitors data like tank levels, oil volumes, etc. HMI display from Pioneer Natural Resources. This HMI from SugarCreek’s food-engineering plant shows their wastewater treatment plant system and allows them to run control operations. This HMI screen built for Mountain Regional Water District shows an overview of the district's system. This screen shows work orders (top half of the screen), KPIs (bottom left), and OEE (bottom right). HMI for Applied Tech Systems (ATS) that displays and monitors work orders for an airplane-production floor at a university facility. HMIs come in a variety of forms, from built-in screens on machines, to computer monitors, to tablets, but regardless of their format or which term you use to refer to them, their purpose is to provide insight into mechanical performance and progress. Similar to how you would interact with your air-conditioning system to check and control the temperature in your house, a plant-floor operator might use an HMI to check and control the temperature of an industrial water tank, or to see if a certain pump in the facility is currently running. Track production time, trends, and tags.In industrial settings, HMIs can be used to: HMI and Graphical User Interface (GUI) are similar but not synonymous: GUIs are often leveraged within HMIs for visualization capabilities. While the term can technically be applied to any screen that allows a user to interact with a device, HMI is most commonly used in the context of an industrial process.Īlthough HMI is the most common term for this technology, it is sometimes referred to as Man-Machine Interface (MMI), Operator Interface Terminal (OIT), Local Operator Interface (LOI), or Operator Terminal (OT). Screens courtesy of Tamaki Controls (middle, right) HMI DefinedĪ Human-Machine Interface (HMI) is a user interface or dashboard that connects a person to a machine, system, or device. Ignition Exchange Community-made Ignition resources.Ignition Maker Edition Made for hobbyist and educational use.Ignition Edge Made for field and OEM devices at the edge.
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