当两个DO_ l0成功执行后，输出点%Q00002被置1。这样的梯级构造，可以使两个功能块都执行，即使有一个的输出没有置为1。在正常的/0暂停时，输出点%Q00002直到和它在同一-行的DO_ 10执行时才被刷新。这种情况在%Q00002被置位后CPU扫描时才出现。一般情况下，在一个DO_10功能块执行后被置位的输出点到下一次CPU扫描期间另
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