DSQC142模块系统DSQC142 DSQC142

DSQC142
DSQC142
DSQC142

输入采样阶段

　　在输入采样阶段，PLC以扫描方式依次地读入所有输入状态和数据，并将它们存入I/O映象区中的相应得单元内。输入采样结束后，转入用户程序执行和输出刷新阶段。在这两个阶段中，即使输入状态和数据发生变化，I/O映象区中的相应单元的状态和数据也不会改变。因此，如果输入是脉冲信号，则该脉冲信号的宽度大于一个扫描周期，才能保证在任何情况下，该输入均能被读入。

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