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SEW MCS41A0075-5A3-4
故障的宏觀診斷就是根據經驗，參照發生故障的環境和現象來確定故障的部位和原因。PLC控制係統的故障宏觀診斷方法如下：
■是否為使用不當引起的故障，如屬於這類故障，則根據使用情況可初步判斷出故障類型、發生部位。常見的使用不當包括供電電源故障、端子接線故障、模板安裝故障、現場操作故障等。
■如果不是使用故障，則可能是偶然性故障或係統運行時間較長所引發的故障。對於這類故障可按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、執行機構和負載是否有故障：然後檢查PLC的I/O模板是否有故障：後檢查PLC的CPU是否有故障。
■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。
■採取上述步驟還檢查不出故障部位和原因，則可能是係統設計錯誤，此時要重新檢查係統設計，包括硬件設計和軟件設計。
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