IC695AC00輸出模塊;
IC695AC00輸出模塊

為了便于PLC故障的及時(shí)解決,首先要區(qū)分故障是全局性還是局部性的,如上位機(jī)顯示多處控制元件工作不正常,提示很多報(bào)警信息,這就需要檢查CPU模塊、存儲(chǔ)器模塊、通信模塊及電源等公共部分。如果是局部性故障可從以下幾方面進(jìn)行分析。 1.根據(jù)上位機(jī)的報(bào)警信息查找故障
PLC控制系統(tǒng)都具有豐富的自診斷功能,當(dāng)系統(tǒng)發(fā)生故障時(shí)立即給出報(bào)警信息,可以迅速、準(zhǔn)確地查明原因并確定故障部位,具有事半功倍的效果,是維修人員排除故障的基本手段和方法。 2.根據(jù)動(dòng)作順序診斷故障
對(duì)于自動(dòng)控制,其動(dòng)作都是按照一定的順序來(lái)完成的,通過(guò)觀察系統(tǒng)的運(yùn)動(dòng)過(guò)程,比較故障和正常時(shí)的情況,即可發(fā)現(xiàn)疑點(diǎn),診斷出故障原因。如某水泵需要前后閥門(mén)都要打開(kāi)才能開(kāi)啟,如果管路不通水泵是不能啟動(dòng)的。 3.根據(jù)PLC輸入輸出口狀態(tài)診斷故障
在PLC控制系統(tǒng)中,輸入輸出信號(hào)的傳遞是通過(guò)PLC的I/O模塊實(shí)現(xiàn)的,因此一些故障會(huì)在PLC的1/0接口通道上反映出來(lái),這個(gè)特點(diǎn)為故障診斷提供了方便。如果不是PLC系統(tǒng)本身的硬件故障,可不必查看程序和有關(guān)電路圖,通過(guò)查詢(xún)PLC的I/O接口狀態(tài),即可找出故障原因。因此要熟悉控制對(duì)象的PLC的I/O通常狀態(tài)和故障狀態(tài)。 4.通過(guò)PLC程序診斷故障
PLC控制系統(tǒng)出現(xiàn)的絕大部分故障都是通過(guò)PLC程序檢查出來(lái)的。有些故障可在屏幕上直接顯示出報(bào)警原因;有些雖然在屏幕上有報(bào)警信息,但并沒(méi)有直接反映出報(bào)警的原因;還有些故障不產(chǎn)生報(bào)警信息,只是有些動(dòng)作不執(zhí)行。遇到后兩種情況,跟蹤PLC程序的運(yùn)行是確診故障的有效方法。對(duì)于簡(jiǎn)單故障可根據(jù)程序通過(guò)PLC的狀態(tài)顯示信息,監(jiān)視相關(guān)輸人、輸出及標(biāo)志位的狀態(tài),跟蹤程序的運(yùn)行,而復(fù)雜的故障必須使用編程器來(lái)跟蹤程序的運(yùn)行。如某水泵不工作,檢查發(fā)現(xiàn)對(duì)應(yīng)的PLC輸出端口為0,于是通過(guò)查看程序發(fā)現(xiàn)熱水泵還受到水溫的控制,水溫不夠PLC就沒(méi)有輸出,把水溫升高后故障排除。 當(dāng)然,上述方法只是給出了故障解決的切入點(diǎn),產(chǎn)生故障的原因很多,所以單純依靠某種方法是不能實(shí)現(xiàn)故障檢測(cè)的,需要多種方法結(jié)合,配合電路、機(jī)械等部分綜合分析。
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