因为总是要测试数据类型，所以也可以创建一个属性用于存储单元格的数据类型信息。
Because you're testing for the data type anyway, you can also create an attribute that stores the cell's data type information.
从存储单元或寄存器快速地存取信息的能力。
A capability of accessing information quickly from storage unit or register.
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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