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liujianbo818
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樓主  發(fā)表于: 2009-03-18 20:45
第一次用西門(mén)子的PLC，遇到個(gè)問(wèn)題！請高手們不要見(jiàn)笑。
LD   SM0.0
MOVD  120 VW0
后運行發(fā)現VW0中是120
但我用到VW1時(shí)，發(fā)現VW1被占用了。這個(gè)是什么意思？
wlw
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1樓  發(fā)表于: 2010-12-01 21:28
引用
引用第3樓liujianbo818于2009-03-18 20:57發(fā)表的  :
不明白占用的數據怎么是，高8位是120，除了符號位~！0111 1000 0000 0000


        你傳送的120是10進(jìn)制在2進(jìn)制表達的是0111 1000 0000 0000。如10進(jìn)制1428用2進(jìn)制表達是00101001101.
            10#3592=2#000100000111

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