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About Human Machine Interfaces (Operator Interface Terminals)
Human machine interfaces (HMI) are operator interface terminals with which users interact in order to control other devices. Some human machine interfaces include knobs, levers, and controls. Others provide programmable function keys or a full key pad. Devices that include a processor or interface to personal computers (PCs) are also available. Many human machine interfaces include alphanumeric or graphic displays. For ease of use, these displays are often backlit or use standard messages. When selecting human machine interfaces, important considerations include devices supported and devices controlled. Device dimensions, operating temperature, operating humidity, and vibration and shock ratings are other important factors.
Many human machine interfaces include flat panel displays (FPDs) that use liquid crystal display (LCD) or gas plasma technologies. In LCDs, an electric current passes through a liquid crystal solution that is trapped between two sheets of polarizing material. The crystals align themselves so that light cannot pass, producing an image on the screen. LCDs can be monochrome or color. Color displays can use a passive matrix or an active matrix. Passive matrix displays contain a grid of horizontal and vertical wires with an LCD element at each intersection. In active matrix displays, each pixel has a transistor that is switched directly on or off, improving response times. Unlike LCDs, gas plasma displays consist of an array of pixels, each of which contains red, blue, and green subpixels. In the plasma state, gas reacts with the subpixels to display the appropriate color.
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Rockwell Automation Electronic Operator Interface Electronic Operator Interface Related Links See Allen-Bradley / Rockwell Automation Profile & Catalog |
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Rugged Human Machine Interface and Mobile Data Terminals by... Human Machine Interface Terminals Rugged HMI terminals built for demanding environments. Rugged Operator Interface & Mobile Data Terminals See QSI Corporation Information |
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Operator Interface and Human Machine Interface (HMI) Terminals... Rugged Operator Interface & Mobile Data Terminals Industrial Human Machine Interface Terminals See QSI Corporation Information |
Part Numbers for Human Machine Interfaces Operator Interface Terminals
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| OP-620 | Automationdirect.com | Not Provided | Human Machine Interfaces (Operator Interface Terminals) | Requires use of OP-WINEDIT software, one or multiple per CPU |
| EA7-S6M | Automationdirect.com | Not Provided | Human Machine Interfaces (Operator Interface Terminals) | Analog touch sensing to eliminate touch cell boundaries |
| EA7-T10C | Automationdirect.com | Not Provided | Human Machine Interfaces (Operator Interface Terminals) | Analog touch sensing to eliminate touch cell boundaries |
| OP-420 | Automationdirect.com | Not Provided | Human Machine Interfaces (Operator Interface Terminals) | Requires use of OP-WINEDIT software, one per port per CPU |
| EA7-T6C | Automationdirect.com | Not Provided | Human Machine Interfaces (Operator Interface Terminals) | Analog touch sensing to eliminate touch cell boundaries |
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