What is an HMI or Human Machine Interface?
A Human-Machine Interface (HMI) is a user interface that facilitates communication between a person and a machine, or system. While this can technically refer to any screen that enables user interaction with a device, it is most commonly associated with industrial processes.
Although “HMI” is the most widely used term, this technology is also known by other names, including Man-Machine Interface (MMI), Operator Interface Terminal (OIT), Local Operator Interface (LOI), and Operator Terminal (OT). It’s important to note that while HMI and Graphical User Interface (GUI) are similar, they are not synonymous. GUIs are often components within HMIs, particularly for enhancing visualization capabilities.
In industrial environments, HMIs serve several functions, such as:
- Control and operation of a system’s functions
- Overseeing machine inputs and outputs
- Tracking production times, trends, and tags
- Visually displaying data
- Monitoring key performance indicators (KPIs)
- And more
HMIs are available in various formats, ranging from built-in screens on machinery to computer monitors and tablets. Regardless of their form or the specific terminology used, the primary purpose of an HMI is to provide insights into the performance and status of mechanical systems.