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問：SIEMENS S7-200PLC寫的一個大型的程序，假如在程序的中間有個M 點被置位，請問這個M 點下面的所有的觸頭是馬上動作呢？還是等到下一個掃描周期才開始動作啊？
M 點下面的所有的觸頭 意思是CPU剛好執(zhí)行到M點的線圈被置位這個網(wǎng)絡(luò)，M點所有的觸頭都在這個網(wǎng)絡(luò)的下面，還沒有被執(zhí)行到。
答：m點置位后,后面的程序中m點變成1,如果在后面程序中對m點再置零,則置零點后面的程序中m點又變?yōu)?在程序中被使用,即m點在程序中可以被多次反復(fù)置位或清零,mb,mw,md也都可以在程序中被多次賦值,而新值立即生效,使用時請注意.
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