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PLC stands for programmable logic controller. A PLC is a programmable computing device that is used to manage electromechanical processes, usually in the industrial niche. A PLC is sometimes referred to as an industrial PC, a term that describes a PLC’s main function as a specialized industrial computing machine. PLCs monitor the state of an input device such as signals from a light switch, and make decisions about the next state of an output device, for example switching a light on or off.
PLCs are also used to transfer information from devices at factories or from offsite locations to centralized applications, often running on PCs. PLCs are commonly used for device monitoring and reporting, to diagnose faults in hardware devices like industrial machines and tools, and to effect device events.