140XCP51000輸入接線 PLC一般接受行程開關(guān)、限位開關(guān)等輸入的開關(guān)量信號。
    輸入接線端子是PLC與外部傳感器負載轉(zhuǎn)換信號的端口。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或集電極開路的NPN管。輸入器件接通時，輸入端接通，輸入線路閉合，同時輸入指示的發(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RC濾波器，以防止由于輸入觸點抖動或從輸入線路串入的電噪聲引起PLC誤動作。若在輸入觸點電路串聯(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)，串聯(lián)二極管的數(shù)目不能超過兩只。另外，輸入接線還應(yīng)特別注意以下幾點：
（1）輸入接線一般不要超過30m。但如果環(huán)境干擾較小，電壓降不大時，輸入接線可適當長些。
（2）輸入、輸出線不能用同一根電纜，輸入、輸出線要分開。

（3）可編程控制器所能接受的脈沖信號的寬度，應(yīng)大于掃描周期的時間。

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