HONEYWELL FC-PSU-UNI2450U V1.0
HONEYWELL FC-PSU-UNI2450U V1.0
HONEYWELL FC-PSU-UNI2450U V1.0
PLC控制系統(tǒng)主要由輸入部分、CPU、采樣部分、輸出控制和通訊部分組成，如圖1所示。輸入部分包括控制面板和輸入模板；采樣部分包括采樣控制模板、AD轉(zhuǎn)換模板和傳感器；CPU作為系統(tǒng)的核心，完成接收數(shù)據(jù)，處理數(shù)據(jù)，輸出控制信號；輸出部分有的系統(tǒng)用到DA模板，將輸出信號轉(zhuǎn)換為模擬量信號，經(jīng)過功放驅(qū)動執(zhí)行器；大多數(shù)系統(tǒng)直接將輸出信號給輸出模板，由輸出模板驅(qū)動執(zhí)行器工作；通訊部分由通訊模板和上位機組成。
因為PLC本身的故障可能性極小，系統(tǒng)的故障主要來自外圍的元部件，所以它的故障可分為如下幾種：
（1）輸入故障，即操作人員的操作失誤；
■傳感器故障；
■執(zhí)行器故障；
■PLC軟件故障
這些故障，都可以用合適的故障診斷方法進行分析和用軟件進行實時監(jiān)測，對故障進行預(yù)報和處理。
PLC控制系統(tǒng)的故障診斷方法
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。
■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。
■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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