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In the process of industrial production,a large number of switching quantities are controlled sequentially,which performs sequential actions according to logical conditions,and controls chain protection actions according to logical relationships,as well as a large number of discrete data collection.Traditionally,these functions have been achieved through pneumatic or electrical control systems.In 1968,the American GM(General Motors)company proposed to replace the electrical control device.In the following year,the American digital company developed a control device based on integrated circuits and electronic technology.It is the first generation programmable controller,called ProgrammableController(PC).

在工业生产过程中，大量的开关量顺序控制，它按照逻辑条件进行顺序动作，并按照逻辑关系进行连锁保护动作的控制，及大量离散量的数据采集。传统上，这些功能是通过气动或电气控制系统来实现的。1968年美国GM（通用汽车）公司提出取代继电气控制装置的要求，第二年，美国数字公司研制出了基于集成电路和电子技术的控制装置，首次采用程序化的手段应用于电气控制，这就是第一代可编程序控制器，称ProgrammableController（PC）。