L2 process control level takes charge of making criterion and plan of production, collecting process data, enacting some parameters and calculating some mathematic models.
L2过程控制级负责生成生产计划和标准，进行过程数据收集和一些控制数据的设定。
L2, a process control level, performs the function of the data flow management.
L2过程控制级承担了信息流管理功能。
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