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我用WINCC Flexible 2008软件在画面画了一个按钮，地址建立的是I0.0，与PLC通信，在触摸屏还是那个点击那个按钮，PLC中I0.0不动作，这是因为什么？如果我家一个位存储器自锁，点击M0.0就可以使他动作
钻石用户推荐最佳答案
其实你的想法没有错，你的按钮的功能也已经执行了，只是因为PLC是循环扫描的，每次执行用户程序前都会更新输入输出模块对应的输入映像区， 这样当你的按钮在一次扫描中改变之后，PLC的下一次扫描就将数据覆盖了，因此你看不到效果。
其实你可以在OB1的第一个程序段， 写一个这样的程序，你就理解了。
O I0.0
ON I0.0
= I0.0
这样无论你怎样改变输入模块的状态，在PLC程序中，I0.0 永远是 1， 当然这个方法不推荐在实际中应用， 只是给你一个参考。
提问者对于答案的评价：
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