3、外部DC24V電源 若輸入回路有 DC24V供電的接近開關、光電開關等，而PLC上DC24V電源容量不夠時，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，否則會影響PLC的運行。

4、輸入的靈敏度各廠家對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，啟動電流為4．5mA，關 斷電流小于1．5mA，因此，當輸入回路串有二極管或電阻（不能完全啟動），或者有并聯(lián)電阻或有漏電流時（不能完全切斷），就會有誤動作，靈敏度下降，對 此應采取措施。另一方面，當輸入器件的輸入電流大于PLC的最大輸入電流時，也會引起誤動作，應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輸入元件的公共點電位相對為負，電流是流出 PLC的輸入端。

備貨，備貨，降降降，火火火，火火火……
————————————————————————————————
公司名稱：廈門泰尼電氣有限公司
聯(lián)系人：小黃（銷售代表）
聯(lián)系電話：0592-6809319
傳真號碼：0592-6890859（麻煩備注01006收）
手機：189-5019-1386微信同號
QQ號碼:2917675397
地址：廈門市海滄區(qū)海滄農(nóng)場海農(nóng)北里17號
誠信經(jīng)營，質(zhì)量為首，誠信至上，泰尼電氣小黃竭誠為您服務?。?！
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