国际电工委员会(IEC)在1985年的PLC标准草案第3稿中，对PLC作了如下定义：“可编程序控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存储器，用来在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字式、模拟式的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于使工业控制系统形成一个整体，易于扩充其功能的原则设计。”从上述定义可以看出，PLC是一种用程序来改变控制功能的工业控制计算机，除了能完成各种各样的控制功能外，还有与其他计算机通信联网的功能。
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