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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Power Source Power Supply ERD24SB #10131
Allen Bradley Programming Terminal 1201-HA2 #29536
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SEW Eurodrive MFD32A 8235538.12.12 #8418
GM PC Board GM3026A Circuit Board #13181
Lenze Gear Reduction Box & Motor MDXMA3, 3.0 KW #6
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Pepperl & Fuchs Sensor NRB50-FP-E34-C #8740
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