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TSXAEY414 TSXAEY414
TSXAEY414 TSXAEY414
產(chǎn)品價(jià)格:¥99
上架日期:2015-08-21 10:19:56
產(chǎn)地:法國(guó)
發(fā)貨地:廈門
供應(yīng)數(shù)量:不限
最少起訂:1個(gè)
瀏覽量:18
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    TSXAEY414產(chǎn)品描述:

    TSXAEY414

    廈門卡庫(kù)電氣有限公司
    聯(lián)系人:嚴(yán)小姐
    手機(jī):18030229052
    電話:0592-5709823
    傳真:0592-5709828
    Q Q :1093230189
    地址;廈門湖里區(qū)枋湖西一里22號(hào)1302室


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    控制電器;短路;開(kāi)路;梯形圖;檢測(cè) 一、引言 可編程序控制器(PLC)突出的特點(diǎn)是可靠性高,在以PLC為主組成的PLC控制系統(tǒng)中絕大部分故障來(lái)自外部控制電器,如由按鈕,行程開(kāi)關(guān)等的損壞所引起??刂齐娖鞯墓收戏譃閮深悾阂活愂强刂齐娖鞯挠|點(diǎn)產(chǎn)生氧化膜,使觸點(diǎn)無(wú)法閉合而產(chǎn)生開(kāi)路故障;另一類是控制電器觸點(diǎn)熔合而產(chǎn)生短路故障。這都將影響PLC控制系統(tǒng)的正常工作。為能快速準(zhǔn)確地對(duì)PLC控制系統(tǒng)中控制電器的故障進(jìn)行檢測(cè),探討利用PLC內(nèi)部富余的器件對(duì)PLC輸入控制電器的開(kāi)路與短路故障進(jìn)行自動(dòng)診斷,以便及時(shí)排除故障,保證PLC控制系統(tǒng)的正常運(yùn)行。 二、輸入控制電器短路故障的檢測(cè) 1、短路故障的分析與設(shè)計(jì) 為檢測(cè)出某控制電器的短路故障,可在梯形圖有關(guān)的步序段中串聯(lián)上被檢測(cè)電器的常開(kāi)點(diǎn),當(dāng)該電器常開(kāi)點(diǎn)變?yōu)殚]合即出現(xiàn)短路故障時(shí),則立即接通輸出繼電器,此繼電器為PLC輔助繼電器,使有關(guān)的輸出設(shè)備停止工作,并使故障指示燈亮,以使操作人員迅速發(fā)現(xiàn)故障并判斷出原因。為避免在步序轉(zhuǎn)換瞬間有些被檢測(cè)電器的常開(kāi)點(diǎn)閉合,致使故障指示出現(xiàn)短暫的錯(cuò)誤,可根據(jù)需要設(shè)置若干個(gè)定時(shí)器,使步轉(zhuǎn)換時(shí)間相同且有間隔的步共用一個(gè)定時(shí)器。定時(shí)器的常開(kāi)點(diǎn)串聯(lián)在相應(yīng)的步序段中,時(shí)間設(shè)定值略大于步轉(zhuǎn)換時(shí)間,這樣就不會(huì)出現(xiàn)錯(cuò)誤的故障指示。若在每一步序段中設(shè)置一個(gè)由PLC內(nèi)部輔助繼電器組成的步序狀態(tài)指示器,將指示器的常開(kāi)點(diǎn)與上述定時(shí)器的常開(kāi)點(diǎn)和故障輸出繼電器串聯(lián)起來(lái),就可實(shí)現(xiàn)利用步序狀態(tài)指示器對(duì)該步進(jìn)行故障檢測(cè)。只有系統(tǒng)運(yùn)行到該步才能檢測(cè)出有關(guān)的故障電器。 PLC控制系統(tǒng)的輸入控制電器可能多達(dá)幾十甚至上百個(gè),即系統(tǒng)有幾十甚至上百個(gè)步序段,而狀態(tài)寄存器的觸點(diǎn)只能使用一次。若按步序指令編制程序,為檢測(cè)故障就需另選內(nèi)部輔助繼電器作為狀態(tài)指示器。這樣不僅占用了大量輔助繼電器,而且使梯形圖相當(dāng)復(fù)雜。在這種情形之下,采用移位寄存器的編程方法來(lái)編制程序比較理想。這樣不僅可以利用移位寄存器對(duì)眾多步序段系統(tǒng)進(jìn)行控制,而且可利用PLC內(nèi)部豐富的輔助繼電器作為步序狀態(tài)指示器,從而實(shí)現(xiàn)對(duì)眾多輸入控制電器的故障檢測(cè)。 2、故障檢測(cè)的選擇 假若在每一步序段對(duì)所有的輸入控制電器全部進(jìn)行檢測(cè),這將使梯形圖非常繁雜。



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