描述
可编程控制器PLC是一种数字运算操作的电子系统,专为在工业环境应用而设计;它采用一类可编程的存储器,用于其内部存储程序,执行逻缉运算、顺序控制、定时、计数与算术运算等操作指令,并通过数字、模拟式的输入、输出,控制各种类型的机械或生产过程;可编程控制器及其有关外围设备的设计,都要按照“易于与工业控制系统联成一个整体、易于扩充功能的原则”进行。由该定义可知:PLC是一种由“事先存贮的程序”来确定控制功能的工控类计算机。
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