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whangchuang
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樓主  發(fā)表于: 2011-11-06 14:54
機械臂下降時(shí)。電磁鐵壓著(zhù)大球進(jìn)，下限位SQ2斷開(kāi)，壓著(zhù)小球時(shí)，SQ2導通。
請問(wèn)高手。機械臂在下降時(shí)，當是壓著(zhù)大球 （SQ2要斷開(kāi)）怎么判斷讓它停止下降呢？
SQ2是下限位開(kāi)關(guān)。
謝謝。
[ 此帖被whangchuang在2011-11-06 16:20重新編輯 ]
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1樓  發(fā)表于: 2011-11-07 08:21
謝謝你的答復。如果加一個(gè)傳感器后，是可以解決。但題目中沒(méi)有說(shuō)到。你看還可以通過(guò)別的方式不呢？謝謝哈！

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