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405642732
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樓主  發(fā)表于: 2011-05-07 15:34
大家好,我是剛剛接觸PLC現在還是在學(xué)習階段,我想法歌題目給大家幫我解答下,我想了好久,我自己都亂了,希望高手可以幫我解答。題目:一機械設備有三臺電動(dòng)機M1,M2,M3和液壓電磁閥YZ,要求實(shí)現如下控制:1、當按正反轉按鈕SB1.SB2時(shí),電動(dòng)機M1實(shí)現正反轉運行,正轉時(shí)帶動(dòng)推桿前進(jìn),反轉時(shí)帶動(dòng)推桿后退。
2、M1正反轉起動(dòng)后15秒,按壓SB3電機才能運行,工作30秒停。
3、M2停止后10秒,M3自行起動(dòng)運行20秒停。
4、當推桿前進(jìn)運動(dòng)時(shí),前端到達接近開(kāi)關(guān)時(shí),停2秒,推桿后退,碰行程開(kāi)關(guān)QS停2秒,再次前進(jìn),前端再次碰到接近開(kāi)關(guān)時(shí),液壓電磁閥YZ得電工作。同時(shí)推桿停2秒后退,再次碰行程開(kāi)關(guān)QF停下。
5、液壓電磁閥YZ工作1分鐘,設備停止工作。
注意:不用接三相過(guò)載保護。
jamesyue
練就一身好的技術(shù)才是硬道理
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1樓  發(fā)表于: 2011-05-07 20:59
沒(méi)看懂寫(xiě)的什么
James

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