EI803F

EI803F

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。
輸入接線還應(yīng)特別注意：
（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(shí)，輸入接線可適當(dāng)長(zhǎng)些。
（2）輸入、輸出線不能用同一根電纜。輸入、輸出線要分開走。
（3）可編程控制器所能接受的脈沖信號(hào)的寬度應(yīng)大于掃描周期的時(shí)間。

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