6181F-12TSXP 可编程逻辑控制器

GJV3072428R207KR240R2
GJR5253000R027007 KT 97
GJV3072440R207 KR 228 R2
GJR5253000R027207KT97D
GJR5253000R027507KT97B
NLWC-07-KIT
GJR5252800R010007KT95

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描述

在输入采样阶段,可编程逻辑控制器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映象区中的相应的单元内。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必须大于一个扫描周期,才能保证在任何情况下,该输入均能被读入。

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