SA801F
SA801F
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。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,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R-C濾波器,以防止由于輸入觸點(diǎn)抖動或從輸入線路串入的電噪聲引起可編程控制器的誤動作。
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,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,輸入接線可適當(dāng)長些。
(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的寬度應(yīng)大于掃描周期的時間。
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