PLC根据所采集的流量、水位、温度等条件自动控制开、停泵的台数，以确保清水供水系统的正常运行。

According to the flux, water level, temperature, etc, PLC sends out command to start or stop pumps, and keeps the system in normal operation condition.

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自动控制时，PLC根据进水压力传感器提供的压力信号，判断是否启、停加压泵。

Under automatic control mode, the PLC judges whether opened or stopped the pressure pumps by the pressure signal which provided by hydraulic pressure sensor.

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