The original K - F - D system was replaced by SCR - D system for main transmission, while PLC was substituted for the original relay contactor control mede.

即主传动系统由SCR-D取代原K-F-D系统，电控部分用可编程序控制器PLC取代原继电器-接触器控制方式。

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It can control the stepper motor to change the pressure of the relay, and the A/D circuit samples the signal of the pressure sensor and then acquires the lock or alarm value after processing.

该校验仪通过步进电机对密度继电器压力进行调节，并通过模数转换电路采集压力传感器的输出，实现对密度继电器报警及闭锁压力的测量。

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Why, if the star broker was fixing to rig a trade for his best client, would he let his assistant who he'd employed for just six months relay his crooked message?

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