A programmable logic controller, PLC or programmable controller is a digital computer used for automation of typically industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. PLCs are used in many industries and machines. PLCs are designed for multiple analogue and digital...
Found on
http://en.wikipedia.org/wiki/Programmable_logic_controller
Serving to replace hard-wire and relays, the PLC can be changed (programmed) without changing wiring and tends to be highly reliable and fast-acting. Industrial environments do not require fans, air conditioning or electrical filters to operate the PLC. The PLC is relatively easy to program or change applications and is reusab...
Found on
http://www.mhia.org/learning/glossary/p
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