因为在连续的PACK_ _IT触发期间当前数据被复制到外部，在PRODUCT表中的最先进入的数据项的副本被留在每个表中存储单元的后面。当PTR=0时，输出点EM传递能流，触发线圈EMPTY。表PRODUCT中没有数据能够在未使用FIFO_ _WRT功能块先进行数据复制而被读取。
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