The definition of PLC​

A Programmable Logic Controller, or PLC for short, is simply a special computer device used for industrial control systems.

Explanation:

A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program to control the state of output devices. ... That is, you can mix and match the types of Input and Output devices to best suit your application.

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