140NOE77100【140NOE77100】模块

140NOE77100
140NOE77100
140NOE77100




CPU从第一条指令开始执行程序，直至遇到结束符后又返回第一条。如此周而复始不断循环。这种工作方式是在系统软件控制下，顺次扫描各输入点的状态，按用户程序进行运算处理，然后顺序向输出点发出相应的控制信号。整个工作过程可分为五个阶段：自诊断，与编程器等的通信，输入采样，用户程序执行，输出刷新

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