注意:如果在第一-次測(cè)試時(shí)，F(xiàn)OR_ LOOP指令的使能輸入有能流，在FOR和相應(yīng)的END_ FOR指令之間的梯級(jí)執(zhí)行循環(huán)的次數(shù)由START，END和INCREMENT最初指定值決定。這種重復(fù)執(zhí)行出現(xiàn)在PLC單個(gè)掃描情況，如果循環(huán)周期長(zhǎng)，這種重復(fù)執(zhí)行可能導(dǎo)致看門狗定時(shí)器停止。

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