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問(wèn)：SIEMENS S7-200PLC寫(xiě)的一個(gè)大型的程序，假如在程序的中間有個(gè)M 點(diǎn)被置位，請(qǐng)問(wèn)這個(gè)M 點(diǎn)下面的所有的觸頭是馬上動(dòng)作呢？還是等到下一個(gè)掃描周期才開(kāi)始動(dòng)作啊？
M 點(diǎn)下面的所有的觸頭 意思是CPU剛好執(zhí)行到M點(diǎn)的線圈被置位這個(gè)網(wǎng)絡(luò)，M點(diǎn)所有的觸頭都在這個(gè)網(wǎng)絡(luò)的下面，還沒(méi)有被執(zhí)行到。
答：m點(diǎn)置位后,后面的程序中m點(diǎn)變成1,如果在后面程序中對(duì)m點(diǎn)再置零,則置零點(diǎn)后面的程序中m點(diǎn)又變?yōu)?在程序中被使用,即m點(diǎn)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(shí)請(qǐng)注意.
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