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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(fā)生前后的情況、故障現(xiàn)象。

2）如果對生疏的PLC維修，應(yīng)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(jìn)行清潔PLC。

先外后內(nèi)

維修PLC時，先檢查外部現(xiàn)象與原因，如果外部正常，則然后檢查PLC內(nèi)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(guān)撥到RUN位置，再根據(jù)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(tài)（地方），一般是處于中間狀態(tài)，則查找引起下一步操作發(fā)生的信號，編程器會顯示信號的ON/OFF狀態(tài)。

2）如果輸入信號，將編程器顯示的狀態(tài)與輸入模塊的LED指示作比較，若結(jié)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(guān)連接是否正常。

3）如果輸入狀態(tài)與輸入模塊的LED指示一致，則比較發(fā)光二極管與輸入裝置的狀態(tài)。如果兩者不同，則需要測量一下輸入模塊。如果發(fā)現(xiàn)存在問題，則需要更換I/O裝置、現(xiàn)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(tài)不同，則需要用編程器檢查輸出的驅(qū)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(shù)器，則需要先檢查控制復(fù)位的邏輯，再檢查計數(shù)器信號。然后檢查、判斷相關(guān)組件是否異常，需要更換。

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