急停按钮开关和互锁通常是常闭的,从而控制-个电力机械主控继电器(参看下图),这个继电器应当可以直接的使电机启动和PLC输出电路等失效,这类的电路在故障时“打开”,从而使设备失效,例如如果一根接线断裂或者-一个触点磨损,那么回路会断开并且MCR失电。如果固态设备出现故障,
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