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3708407
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樓主  發(fā)表于: 2009-07-18 16:21
各位同仁:
大家好,
請大家幫助一下,誰(shuí)能用VB寫(xiě)一程序,讀寫(xiě)PLC中的數據,例如將數某一數值,寫(xiě)入PLC中的一個(gè)D元件中,固定向D0寫(xiě)入數值,10進(jìn)制的,一個(gè)數值輸入框,一個(gè)寫(xiě)入按鈕,好像用到mscomm控件,雖然網(wǎng)上很多例子,但都很復雜,發(fā)來(lái)源代碼,不勝感激.謝謝.
xingshengwei
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1樓  發(fā)表于: 2009-07-22 22:24
private sub command1_click()
       mscomm1.output=chr(2)+"1"+"1000"+text1.text+chr(3)+sum
end sub

sum是校驗和=chr(2)~chr(3)不包括chr(2)的字符串的ascii碼的16進(jìn)制和的后兩位
如輸入數值為"1“則sum=31H+31H+30H+30H+30H+31H+03H=126H取后兩位字符="26"

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