3BHE003688R0001

3BHE003688R0001

NOP指令：空操作指令。

END指令：程序結(jié)束指令。

指令說明

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，而與此無關(guān)。若在程序執(zhí)行過程中加入空操作指令，則在修改或追加程序時(shí)，可以減少步序號的變化，但是程序步須留有空余。

2．若將已寫入的指令換成NOP指令，則電路會發(fā)生變化，務(wù)必請注意。

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，可依次檢測各程序邏輯段的動(dòng)作。在這種場合，在確認(rèn)前面電路塊動(dòng)作正確無誤后，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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