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plcxx
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樓主  發(fā)表于: 2008-11-27 16:55
今天看到了一個(gè)程序,如下(截圖部分)


我想問(wèn)的是是關(guān)于M8013的,程序上的解說(shuō)是秒脈沖,去掉的話(huà)T0就會(huì )變成計數到50而不是計時(shí)到5S
想問(wèn)下各位高手,用M8013有什么好處啊,去掉的話(huà)怎么就讓T0就會(huì )變成計數啦?
gang.liu9
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1樓  發(fā)表于: 2009-02-07 22:49
M8013為1秒的時(shí)鐘脈沖,0.5為ON0.5為OFF。
當用M8013時(shí)每一秒發(fā)出一個(gè)脈沖。
本例中,T0的觸點(diǎn)是不會(huì )動(dòng)作的,因T0線(xiàn)圈通電時(shí)間只有0。5秒,達不到T0設定值。
當去掉M8013后,M0接通就計時(shí)器就會(huì )計時(shí),M0接通長(cháng)達5S時(shí)計時(shí)停止。這時(shí)T0還是計時(shí)器,并沒(méi)有計數功能。
當去掉T0后,改為-(C0  K5),則可成為5秒的計時(shí)器。

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