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hawson
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樓主  發(fā)表于: 2011-05-05 14:48
最近看到一個(gè)控制電路急停按鈕用常開(kāi)點(diǎn)接PLC輸入點(diǎn)，限位開(kāi)關(guān)也用常開(kāi)點(diǎn)接PLC輸入點(diǎn)。這個(gè)控制電路工作多年了，很正常，可總是覺(jué)得怪怪的，但說(shuō)不出錯在哪里。大家議議。
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wei0212007
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1樓  發(fā)表于: 2011-05-05 14:55
這種急停，一旦線(xiàn)路出問(wèn)題（斷線(xiàn)）將失去了急停的作用。造成嚴重的事故。
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