PLC的 个扫描周期必经输入采样、程序执行和输出刷新三个阶段。

PLC在输入采样阶段： 以扫描方式按顺序将所有暂存在输入锁存器中的输入端子的通断状态或输入数据读入，并将其写入各对应的输入状态寄存器中，即刷新输入。随即关闭输入端口，进入程序执行阶段。

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