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Programmable logic controller
A programmable logic controller (PLC), or programmable controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed or non-volatile memory. A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result.

PLC and Programmable Logic Controller are registered trademarks of the Allen-Bradley Company, although they are widely used generically.

Features

The main difference from other computers is that PLC are armored for severe condition (dust, moisture, heat, cold,