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介绍了高速公路指示灯的控制原理电路,重点阐述了PLC掉电或故障下的控制隐患,增加的保持电路必要性,以及保持电路的实现方法。
The control circuit of expressway lamp is introduced. The hidden trouble of PLC under the condition of power failure or failure of PLC, the necessity of added holding circuit and the realization of holding circuit are mainly described.