Process displays, regulators, PLC systems and other types of human machine interfaces (HMI) are all widely used in the automation industry in order for people to directly monitor and alter activities and performance. A commonly used process display will show a number on a screen which might do anything from counting the number of components that have passed through a process in a given time period to counting down until an automated action is repeated. Process displays tend to be available with a number of digits, in LEDS and can have a variety of input types. Regulators are able to provide the ability to restrict or speed up work flows at any given point in an automated process, helping to regulate, for instance, the flow of products from a hopper to a production line. A programmable logic controller, or PLC system, allows for such automation to be controlled according to the software setting it has received which can be altered for a variety of applications, as needed. Finally, an HMI allows people to alter functions within automated process, usually at the touch of a button from an HMI panel or liquid crystal display key touch system.
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