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樓主  發(fā)表于: 2008-08-05 22:12
在S7-300中要有沒(méi)有好一點(diǎn)的LAD條件判斷指令,

如高級編程語(yǔ)言中的

IF T1>30 OR T2>30 OR T3>30
   .....

ENDIF

把這樣的條件判斷寫(xiě)在同一個(gè)NETWORK中

因為在3個(gè)溫度滿(mǎn)足時(shí),要執行相同的動(dòng)作.雖然寫(xiě)一個(gè)后,其余可copy,paste,但是程序顯得很冗長(cháng),笨拙.或者有個(gè)好用的條件判斷

后,把相同的動(dòng)作寫(xiě)成子程序,重復調用.

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