羅克韋爾20F11ND077AA0NNNNN

可編程控制器一般接受行程開關(guān)、限位開關(guān)等輸入的開關(guān)量信號(hào)。輸入接線端子是可編程控制器與外部傳感器負(fù)載轉(zhuǎn)換信號(hào)的端口，輸入接線一般指外部傳感器與輸入端口的接線。

輸入器件可以是任何無源的觸點(diǎn)或集電極開路的NPN管。輸入器件接通時(shí)，輸入端接通，輸入線路閉合，同時(shí)輸入指示的發(fā)光二極管亮。

輸入端的一次電路與二次電路之間采用光電耦合隔離。二次電路帶R-C濾波器，以防止由于輸入觸點(diǎn)抖動(dòng)或從輸入線路串入的電噪聲引起可編程控制器的誤動(dòng)作。

若在輸入觸點(diǎn)電路串聯(lián)二極管，在串聯(lián)二極管上的電壓應(yīng)小于4V。若使用帶發(fā)光二極管的舌簧開關(guān)時(shí)，串聯(lián)二極管的數(shù)目不能超過兩只。

羅克韋爾20F11ND077AA0NNNNN 

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