如果指示燈沒有點亮，模板可能損壞，或者LED指示燈被損壞.如果指示燈點亮，但輸出設(shè)備沒有運行，在接線端子上可以檢測到電壓值或電阻值。如果檢測到的電壓等級與當(dāng)前的電壓等級一致，請檢查輸出設(shè)備或與之相關(guān)的配線.如果輸出模板的輸出均不工作，可能是外部電源故障，可能沒有送電或連接不正確。(輸入和輸出設(shè)備通過一-個外部電源提供電源，不由模板內(nèi)部供電).如果輸出模板安裝有保險(某些模板用用短路保護取代了保險)，保險的LED指示燈(標(biāo)簽為“F”)，如上圖所示，如果保險熔斷該指示燈將點亮.

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