注意:如果在第一-次测试时,FOR_ LOOP指令的使能输入有能流,在FOR和相应的END_ FOR指令之间的梯级执行循环的次数由START,END和INCREMENT最初指定值决定。这种重复执行出现在PLC单个扫描情况,如果循环周期长,这种重复执行可能导致看门狗定时器停止。
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