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Programmable Logic Controller (PLC) is a digital arithmetic controller with a microprocessor for automation control, which can load control instructions into memory for storage and execution at any time. A programmable controller consists of functional units such as CPU, instruction and data memory, input/output interfaces, power supply, and digital to analog conversion. Early programmable logic controllers only had the function of logic control, so they were named programmable logic controllers. Later, with continuous development, these originally simple computer modules had various functions including logic control, timing control, analog control, multi machine communication, etc. The name was also changed to programmable controller. However, due to its abbreviation PC and personal computer Due to conflicting abbreviations and habitual reasons, people still frequently use the term programmable logic controller and still use the abbreviation PLC