1769-IM12
1769-IM12。
1769-IM12
西門子S7-200PLC中涉及堆棧操作的指令和梯形圖應(yīng)用實例
堆棧是計算機中最常用的一種數(shù)據(jù)結(jié)構(gòu)，遵循先入后出的原則，一般用于保存數(shù)據(jù)。在S7-200PLC中涉及堆棧操作的指令有以下三種，最后本文給出了梯形圖應(yīng)用實例。
邏輯入棧（LPS，Logic Push）指令復制棧頂?shù)闹挡⑦@個值推入棧頂，原棧頂中各級數(shù)據(jù)依次向下一級推移，棧底值被推出丟失。
邏輯讀棧（LRD，Logic Read）指令將堆棧中第2層的值復制到棧頂，第2~9層的數(shù)據(jù)不變，原棧頂值消失。
GHV6010040V0006, R12
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