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Programmable controller,referred to as PLC(Programmable logic Controller),refers to a new type of industrial control device based on computer technology.

PLC was defined as follows in the draft PLC standard promulgated by the International Electrotechnical Commission in 1987:”PLC is an electronic device specially designed for digital operation in industrial environments.It uses programmable Memory is used to store instructions for performing logical operations,sequential operations,timing,counting and arithmetic operations in it,and can control various types of machinery or production processes through digital or analog input and output.PLC And its related peripheral equipment should be designed according to the principle of easy to form a whole with the industrial control system and easy to expand its functions.

可编程控制器，简称PLC（ProgrammablelogicController）,是指以计算机技术为基础的新型工业控制装置。

在1987年国际电工委员会（InternationalElectricalCommittee）颁布的PLC标准草案中对PLC做了如下定义：“PLC是一种专门为在工业环境下应用而设计的数字运算操作的电子装置。它采用可以编制程序的存储器，用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令，并能通过数字式或模拟式的输入和输出，控制各种类型的机械或生产过程。PLC及其有关的外围设备都应该按易于与工业控制系统形成一个整体，易于扩展其功能的原则而设计。