140DDO35300 Quantum

對于PLC輸出點（這里僅談繼電器輸出型），若動作對象所對應的指示燈不亮，在確定PLC在運行狀態(tài)下，那么說明此動作對象的PLC輸入輸出邏輯功能沒有滿足，也就是說輸入回路出故障，按前面講的，檢查輸入回路。若所對應的指示燈亮，但所對應的執(zhí)行元件如電磁閥、接觸器不動作，先查電磁閥控制電源及保險器，簡便的方法，用電筆去量所對應PLC輸出點的公共端子。電筆不亮，可能對應保險絲熔斷等電源故障。電筆亮，說明電源是好的，所對應的電磁閥、接觸器、線路出故障。排除電磁閥、接觸器、線路等故障后，仍不正常，就利用萬用表一只表筆，一頭接對應的輸出公共端子，另一頭接觸所對應的PLC輸出點，這時電磁閥等仍不動作，說明輸出線路出故障。

如果這時電磁閥動作，那么問題在PLC輸出點上。由于電筆有時會虛報，可用另一種方法分析，用萬用表電壓檔量PLC輸出點與公共端的電壓，電壓為零或接近零，說明PLC輸出點正常，故障點在外圍。若電壓較高，說明此觸點接觸電阻太大，已損壞。另外，當指示燈不亮，但對應的電磁閥、接觸器等動作，這可能此輸出點因過載或短路燒牢。這時應把此輸出點的外接線拆下來，再用萬用表電阻檔去量輸出點與公共端的電阻，若電阻較小，說明此觸點已壞，若電阻無窮大，說明此觸點是好的，應 是所對應的輸出指示燈已壞。

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