A Human-Machine Interface (HMI) is a user interface or dashboard that connects a person to a machine, system, or device. 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.
Although 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). HMI and Graphical User Interface (GUI) are similar but not synonymous: GUIs are often leveraged within HMIs for visualization capabilities.
Human machine interfaces differ in terms of performance specifications and I/O ports. Performance specifications include:
- Processor type
- Random access memory (RAM)
- Hard drive capacity
- Drive options (floppy drive or CD-ROM)
I/O interfaces allow connections to peripherals such as mice, keyboards, and modems. Common I/O interfaces include:
- Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps
- Fast Ethernet is a 100 Mbps specification.
- RS232, RS422, RS485 are balanced serial interfaces for the transmission of digital data
- Small Computer Systems Interface (SCSI) is an intelligent I/O parallel peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port.
- Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections
- Industrial Automation HMI display
- Advanced Driver Assist Systems (ADAS) HMI with video
- Medical heart monitoring
- HMI Display & Video IP for display driving, graphic rendering, frame grabbing and video processing
- Track production time, trends, and tags
- Oversee KPIs
- Monitor machine inputs and outputs
Industries using HMI include:
- Food and beverage
- Oil and gas
- Water and waste water
Source : Inductiveautomation, Globalspec
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