氧压自动控制是保证转炉炼钢质量的理想方案，笔者设计了一套转炉吹氧压力限压及信号联锁控制器。
The automatic pressure control of oxygen is an ideal strategy for steel making to ensure the quality. The author designed a pressure limited and interlock controller for oxygen blowing of converter.
跳线必须删除的联锁和自动控制器的操作。
Theinterlock jumper must be removed for the controller to operate automatically.
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.
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