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shenxianguol
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樓主  發(fā)表于: 2009-07-15 21:52
求0+1+2+2+....+100的和，并將和存入D0
解：D1作為循環(huán)增量，在程序中步7和步21之間是一個(gè)完整的循環(huán)，循環(huán)次數100次。每循環(huán)1次，D1中的數據自動(dòng)加1，D0與D1相加，結果存入D0,循環(huán)結束后，D0中存儲的數據為5050.X0是計數控制端，X1是清0控制。
    由于循環(huán)指令在每個(gè)掃描周期都被重復執行，因此，需要在循環(huán)指令開(kāi)始前對循環(huán)中使用的數據寄存器進(jìn)行清0操作，使D0中只能存一個(gè)掃描周期的和。摘自《電氣控制與PLC應用》人民郵電出版社，定價(jià)21.00元。作者：張偉林
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附件： 應用循環(huán)指令求和的程序.rar (1 K) 下載次數:87
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