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caizuge
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樓主  發(fā)表于: 2012-07-13 10:25
我用的壓力傳感器量程(Range)是:0-10MPa,   輸出(Output)是 :4-20mA;   中間串聯(lián)了一個(gè)250歐姆精密電阻,使用EM235模塊采集電壓信號,DIP開(kāi)關(guān)設為0-5V輸入。



這樣的話(huà),是不是我采集到數字量6400,對應的實(shí)際壓力值為0MPa,采集到數字量32000時(shí),對應實(shí)際壓力值為10MPa。然后采集到其他的數字量時(shí),計算公式為

【(VIW0-6400)/(32000-6400)】*10+0    MPa



因為第一次用S7  200采集模擬信號,心理不是很有底,所以想跟各位前輩請教下,謝謝了。
tkggtdkjpl
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1樓  發(fā)表于: 2012-07-13 19:12
先量一下模塊的電壓,再看一下程序是的地址是不是對的
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