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A PLC is an industrial microprocessor-based controller with programmable memory used to store program instructions and various functions.<ref>{{Harvnb|Bolton|2015|p=5}}</ref> It consists of:
* A processor unit (CPU) which interprets inputs, executes the control program stored in memory and sends output signals,
* A [https://plcmeaning.com/plc-power-supply/ power supply unit] which converts AC voltage to DC,
* A memory unit storing data from inputs and program to be executed by the processor,
* An input and output interface, where the controller receives and sends data from and to external devices,
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