ABE8-R44SB11 特价销售

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PLC则是采用循环扫描的工作方式。一个扫描周期主要可分为3个阶段。

1．输入刷新阶段

在输入刷新阶段，CPU扫描全部输入端口，读取其状态并写入输入状态寄存器。完成输入端刷新工作后，将关闭输入端口，转入程序执行阶段。在程序执行期间即使输入端状态发生变化，输入状态寄存器的内容也不会改变，而这些变化必须等到下一工作周期的输入刷新阶段才能被读入。

2．程序执行阶段

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