这一规定位置，继电器驱动单元关闭时由于低电池状态。
This establishes the position that the relay is driven to when the unit shuts down due to low battery state.
从各个单元的结构、气动系统、继电器控制系统和PLC控制系统以及其特点作了详细的分析。
From its characteristics as well as the structural, pneumatic systematic, relay control systematic and PLC control system of every unit, have made detailed analysis.
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