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lochao
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樓主  發(fā)表于: 2012-02-17 12:46
有一個(gè)模擬量擴展模塊EM231CN，外接4路三線(xiàn)制0---20MA的變送器，正確接線(xiàn)后，變送器尚未通電，在 STEP 7 MicroWIN 中進(jìn)行監控，怎么會(huì )有AIW0是22，AIW2是35，AIW4是350,AIW6是84，按道理沒(méi)有通電，應該是0才對，去掉RA,RA+之間的連線(xiàn)，會(huì )顯示為0.而且不停的跳變，不知道這是為什么？
xiet988
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1樓  發(fā)表于: 2012-02-23 09:57
信號有干擾，呵呵

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