对于该新功能，需要在消息描述符中附加字段来保留分段和分组信息。
For this new function, additional fields in message descriptor were needed to keep information for the segmenting and grouping.
有了分组信息之后，我们就可以识别出正确的聚集信息，并计算最终应该返回的结果。
With the group information, we can identify the correct aggregation information and calculate the final result that shall be returned.
对PLC的数据存储单元移位及移值标记的提取，实现对运动工件分组信息跟踪和分组控制。
Extraction the moves' mark and shifting the PLC data storage unit, realizes to the movement work piece's track and the separation control.
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