描述
TRICONEX 3503E
可编程序控制器是一种数字运算操作电子系统，专为在工业环境下应用而设计。它采用了可编程序的存储器，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，并通过数字的，模拟的输入和输出，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的外围设备，都应按易于与工业控制系统形成一个整体、易于扩充其功能的原则设计。
定义强调了PLC是：1数字运算操作的电子系统——也是一种计算机
2专为在工业环境下应用而设计
3面向用户指令——编程方便
4逻辑运算、顺序控制、定时计算和算术操作
5数字量或模拟量输入输出控制
6易与控制系统联成一体
7易于扩充
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