Operator Interface Terminals (HMIs) provide much more versatility than traditional mechanical control panels. An HMI allows a plant floor operator to monitor current conditions of a control system and, if necessary, to initiate a change in the operation of the system. HMIs connect to programmable logic controllers (PLCs) typically through the serial communications port. The HMI can be programmed to monitor and/or change current values stored in the data memory of the PLC. HMIs can have either text or graphics based displays. A text based HMI can display printable text characters but can not print graphics. Some HMIs use touch screen displays while others use a PCB based keypad. PCB based keypads are best used in applications in which the keypad is likely to become dirty. A touch screen HMI provides much more flexibility than typical PCB based keypad displays. Keys can be created in a touch screen HMI that can be made visible only when needed. The HMIs are available in both text display based HMI and graphics display based HMIs
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VP Industrial Electronics
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