第二层联锁机采用可编程控制器（PLC）S7-300。
Theprogrammable controller (PLC) S7-300 is applied in the second layer.
采用可编程控制器进行控制，提高了拉丝机的可靠性和产品质量。
Applying PLC to its control has improved the security of the drawbench and the quality of products.
采用可编程控制器调节电机转速实现消防供水系统压力的自动控制。
By adjusting the rotational speed of motor, it can control the pressure of fire fighting watering system automatically with PLC.
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