基于可编程序控制器（PLC）的水轮机调速器，受PLC内部高速计数器最高计数频率的限制，频率测量大多通过PLC外部单元来实现。
Owing to the limited frequency of the internal high-speed counter of PLC, the peripheral unit of PLC is used for PLC-based frequency measurement of hydraulic turbine governors.
基于可编程序控制器（PLC）的水轮机调速器，受PLC内部高速计数器最高计数频率的限制，频率测量大多通过PLC外部单元来实现。
Owing to the limited frequency of the internal high-speed counter of PLC, the peripheral unit of PLC is used for PLC-based frequency measurement of hydraulic turbine governors.
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