產(chǎn)品詳情
MPC240這種故障可以認(rèn)為是噪聲干擾或PLC內(nèi)部接觸不良。一般來說，噪聲是由小電容電容減小或電路板中元件性能不佳引起的。輕敲PLC本體可以檢查接觸不良的原因。還要檢查電纜和連接器的插入狀態(tài)。
典型的可編程邏輯控制器系統(tǒng)包括一個(gè)現(xiàn)場可編程邏輯控制器站、一臺(tái)通過高速數(shù)據(jù)線連接到現(xiàn)場可編程邏輯控制器站的上位機(jī)和一個(gè)模擬屏幕可編程邏輯控制器站。上位機(jī)用于顯示各種圖形和數(shù)據(jù)，模擬屏PLC站用于驅(qū)動(dòng)模擬屏上的led。當(dāng)整個(gè)PLC系統(tǒng)與外部設(shè)備連接時(shí)，就構(gòu)成了一個(gè)自動(dòng)控制系統(tǒng)。
通常，PLC被視為一個(gè)黑匣子，我們可以簡單地根據(jù)I/O信號(hào)來判斷故障位置。判斷故障有兩種情況，即故障信號(hào)在模擬屏上閃爍和運(yùn)行設(shè)備未在模擬屏上顯示。
1.模擬屏幕上閃爍的故障信號(hào)
根據(jù)PLC控制站的圖紙，先檢查模擬屏PLC柜內(nèi)設(shè)備的顯示狀態(tài)，如果一致則檢查現(xiàn)場PLC柜的顯示狀態(tài)，如果一致則繼續(xù)檢查PLC柜的I/O端子和外部設(shè)備的I/O端子，從而推斷是設(shè)備故障還是PLC故障。上述過程可以用下面的框圖表示。
判斷PLC機(jī)柜的I/O端子和外部設(shè)備的I/O端子是否與狀態(tài)信號(hào)一致的方法非常簡單。只要用萬用表的DC電壓檔測量端子號(hào)和公共端子的電壓值，24V就是斷線，沒有信號(hào)；0V表示開，有信號(hào)。
MPC240
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