1336-B025-AA-EN-GM1

PLC控制系統(tǒng)故障的宏觀診斷
　　故障的宏觀診斷就是根據(jù)經(jīng)驗，參照發(fā)生故障的環(huán)境和現(xiàn)象來確定故障的部位和原因。PLC控制系統(tǒng)的故障宏觀診斷方法如下：
　　■是否為使用不當(dāng)引起的故障，如屬于這類故障，則根據(jù)使用情況可初步判斷出故障類型、發(fā)生部位。常見的使用不當(dāng)包括供電電源故障、端子接線故障、模板安裝故障、現(xiàn)場操作故障等。
1336-B025-AA-EN-GM1

　　■如果不是使用故障，則可能是偶然性故障或系統(tǒng)運行時間較長所引發(fā)的故障。對于這類故障可按PLC的故障分布，依次檢查、判斷故障。首先檢查與實際過程相連的傳感器、檢測開關(guān)、執(zhí)行機(jī)構(gòu)和負(fù)載是否有故障：然后檢查PLC的I/O模板是否有故障：最后檢查PLC的CPU是否有故障。
1336-B025-AA-EN-GM1

　　■在檢查PLC本身故障時，可參考PLC的CPU模板和電源模板上的指示燈。
　　■采取上述步驟還檢查不出故障部位和原因，則可能是系統(tǒng)設(shè)計錯誤，此時要重新檢查系統(tǒng)設(shè)計，包括硬件設(shè)計和軟件設(shè)計。

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140NOM21100    3
IC693BEM331    2
MVI56-PDPS    1
140NOE77101    2
1761-NET-DNI    1
1769-OB16P    4
1757-SRM    1
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1203-GU6    1
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IMASI23            1
140XTS00200    7
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1756-HSC/B    2
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1756-CFM/A    8
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1756-PB75/B    1
1756-PA75          1
1756-A17           1
1756-L55M12        1
1756-IF8           2
1756-OF8           2
1746-NI8           3
1747-L552/B    1
SST-PB3-CLX        1
SST-PB3-PCU        2
1756SC-IF8U        1
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IC697MDL653H       1
IC697CPU780H       1
IC697PWR710M       2
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IC697BEM731    1
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1756-DHRIO         2
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1746-NIO4V         1
1746-NI4           1
1746-IV32         
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1747-L532          1
1756-OF6VI         1
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1756-IF4FXOF2F     1
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1769-L32C          1
1747-ASB           2
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