3BHE003688R0001
3BHE003688R0001
NOP指令：空操作指令。
END指令：程序結(jié)束指令。
指令說(shuō)明
1．在將程序全部清除時(shí)，全部指令成為空操作。若在普通指令與指令之間加入空操作（NOP）指令，則可編程控制器可繼續(xù)工作，而與此無(wú)關(guān)。若在程序執(zhí)行過(guò)程中加入空操作指令，則在修改或追加程序時(shí)，可以減少步序號(hào)的變化，但是程序步須留有空余。
2．若將已寫(xiě)入的指令換成NOP指令，則電路會(huì)發(fā)生變化，務(wù)必請(qǐng)注意。
3．可編程控制器反復(fù)進(jìn)行輸入處理，程序執(zhí)行輸出處理，若在程序的zui后寫(xiě)入END指令，則END以后的其余程序步不再執(zhí)行，而直接進(jìn)行輸出處理。在程序中沒(méi)有END指令時(shí)，可處理到zui終的程序步。
4．在調(diào)試期間，在各程序段插入END指令，可依次檢測(cè)各程序邏輯段的動(dòng)作。在這種場(chǎng)合，在確認(rèn)前面電路塊動(dòng)作正確無(wú)誤后，依次刪去END指令。
NOP指令的應(yīng)用：
①某些步序內(nèi)容為空，留空待用。
②短路某些接點(diǎn)或電路
③切斷某些電路
④變換先前的電路
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