輸入模板的L D指示當一個離散型輸入設備合閘后，與之對應的輸入LED指示燈點亮，表明信號已經(jīng)傳遞到模板。如果指示燈沒有點亮，在模板接線端子板上可以檢測到一個電壓或阻值:如果接線端上的電壓值正確，利用設計軟件檢查PLC中與該點相對應的輸入位。如果軟件中顯示輸入位為邏輯1,那就是模板的LED指示燈電路有問題.

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