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140DSI35300C

140DSI35300C

3、外部DC24V電源 若輸入回路有 DC24V供電的接近開關(guān)、光電開關(guān)等，而PLC上DC24V電源容量不夠時(shí)，要從外部提供DC24V電源；但該電源的“—"端不要與 PLC的 DC24V的“—"端以及“COM"端相連，否則會(huì)影響PLC的運(yùn)行。

4、輸入的靈敏度各廠家對(duì)PLC的輸人端電壓和電流都有規(guī)定，如日本三菱公司F7n系列PLC的輸入值為：DC24V、7mA，啟動(dòng)電流為4．5mA，關(guān) 斷電流小于1．5mA，因此，當(dāng)輸入回路串有二極管或電阻（不能*啟動(dòng)），或者有并聯(lián)電阻或有漏電流時(shí)（不能*切斷），就會(huì)有誤動(dòng)作，靈敏度下降，對(duì) 此應(yīng)采取措施。另一方面，當(dāng)輸入器件的輸入電流大于PLC的zui大輸入電流時(shí)，也會(huì)引起誤動(dòng)作，應(yīng)采用弱電流的輸入器件，并且選用輸人為共漏型輸入的 PLC，Bp輸入元件的公共點(diǎn)電位相對(duì)為負(fù)，電流是流出 PLC的輸入端。

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◆ 企業(yè)名稱：廈門泰尼電氣有限公司

◆ ： 小廖（女士）

◆ ：

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◆ :

誠信經(jīng)營，質(zhì)量為首，服務(wù)*，廈門泰尼小廖竭誠為您服務(wù)?。?！

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