可编程逻辑控制器简称为PLC，它是以单片机为核心的工业控制专用机。

Programmable logic controller is short for PLC. It is a special purpose industry control machine, that kernel is single chip microcomputer.

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单片机也被称为微控制器(Microcontroller)，是因为它最早被用在工业控制领域。

Also known as single-chip MCU (Microcontroller), because it was first used in the field of industrial control.

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