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chaorenlaodi
技術(shù)無(wú)界限,思想無(wú)限遠。!
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樓主  發(fā)表于: 2013-08-31 11:29
選擇是NPN輸出還是PNP輸出的外部電氣(例如接近開(kāi)關(guān))根據是什么?
【1】是看“控制器(PLC、控制卡)”的COM口接的是+24V還是接的0V嗎???
【2】對于三菱的輸入模塊com口接+24V,對接的傳感器類(lèi)型就是NPN型,但是定位模塊(QD75D)其com口接的是0V,卻怎么也用的NPN型傳感器用于上下極限和尋零開(kāi)關(guān)???
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lzzgogo
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1樓  發(fā)表于: 2013-08-31 16:19
  

QD75輸入回路有雙向光耦,所以COM口接+或是-都行。同意一樓的看法,主要是QP75和控制器(PLC、控制卡)接法相同
樓主留言:
選擇是NPN輸出還是PNP輸出的外部電氣(例如接近開(kāi)關(guān))根據是看“控制器(PLC、控制卡)”的COM口接的是+24V還是接的0V嗎?

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