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MDD065D-N-040-N2M-095PBO /R911253964

維修PLC先后順序是怎樣的？

先動口再動手

1）維修PLC時，不要立即直接動手，而是先詢問故障發生前后的情況、故障現象。

2）如果對生疏的PLC維修，應先了解其工作原理。

先清潔再維修

維修PLC時，可以打開機子，首先進行清潔PLC。

先外后內

維修PLC時，先檢查外部現象與原因，如果外部正常，則然后檢查PLC內部。

先無電判斷后通電判斷

首先在沒有通電的情況下，先判斷熔絲是否損壞、是否不通電就可以判斷出故障點。如果不能夠判斷出來，則再通電檢查PLC。

06

查找一般PLC故障的步驟是怎樣的？

PLC維修時，插好編程器，并將開關撥到RUN位置，再根據下列步驟查找：

1）如果PLC停止在某些輸出被激勵的位置、狀態（地方），一般是處于中間狀態，則查找引起下一步操作發生的信號，編程器會顯示信號的ON/OFF狀態。

2）如果輸入信號，將編程器顯示的狀態與輸入模塊的LED指示作比較，若結果不一致，則說明需要更換輸入模塊。更換模塊前，需要先檢查I/O擴展電纜和相關連接是否正常。

3）如果輸入狀態與輸入模塊的LED指示一致，則比較發光二極管與輸入裝置的狀態。如果兩者不同，則需要測量一下輸入模塊。如果發現存在問題，則需要更換I/O裝置、現場接線、電源等。否則，需要更換輸入模塊。

4）如果信號是線圈，沒有輸出或輸出與線圈的狀態不同，則需要用編程器檢查輸出的驅動邏輯，并檢查程序清單。

5）如果信號是定時器，并停在小于999.9的非零值上，則需要更換CPU模塊。

6）如果該信號控制一個計數器，則需要先檢查控制復位的邏輯，再檢查計數器信號。然后檢查、判斷相關組件是否異常，需要更換。

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