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www121421
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樓主  發(fā)表于: 2019-01-29 15:59
鄙人剛開(kāi)始做工控，請教各位前輩一下。

最近看單位以前做的圖紙，發(fā)現 CP1H-XA40DR-A 的輸出通過(guò)中間繼電器驅動(dòng)接觸器的開(kāi)閉。

這款PLC的輸出本身就是繼電器輸出了，而且可以達到 250VAC/2A 的輸出能力，對付正泰NC1的接觸器線(xiàn)圈是綽綽有余的。

那么PLC的輸出非得通過(guò)中間繼電器再轉一下，究竟有什么好處呢？

謝謝各位！
飛龍舞天
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1樓  發(fā)表于: 2019-01-30 18:06
一旦輸出短路，plc內部炸一片

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