As machinery and equipment manufacturing, general elevator control circuit and insurance purposes.
作为机械设备制造中，一般电梯的控制电路和保险之用。
Based on discussion on several common elevator door lock circuits with software, this paper points out some hidden peril of the accident in such circuits, and designs a circuit using PLC.
常见的电梯门锁安全电路中，门锁继电器在多种情况下都可能产生误动作，存在事故隐患。
Application: it's used to indicate the fault of equipments like the electric circuit in air-conditioning room or elevator for passenger or goods.
应用：用于指示空调房间电气线路、乘客和货物的提升等设备的故障。
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