因為在連續(xù)的PACK_ _IT觸發(fā)期間當(dāng)前數(shù)據(jù)被復(fù)制到外部，在PRODUCT表中的最先進入的數(shù)據(jù)項的副本被留在每個表中存儲單元的后面。當(dāng)PTR=0時，輸出點EM傳遞能流，觸發(fā)線圈EMPTY。表PRODUCT中沒有數(shù)據(jù)能夠在未使用FIFO_ _WRT功能塊先進行數(shù)據(jù)復(fù)制而被讀取。

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