6204BZ10100C

6204BZ10100C

6204BZ10100C

  为检测出某控制电器的短路故障，可在梯形图有关的步序段中串联上被检测电器的常开点，当该电器常开点变为闭合即出现短路故障时，则立即接通输出继电器，此继电器为PLC辅助继电器，使有关的输出设备停止工作，并使故障指示灯亮，以使操作人员迅速发现故障并判断出原因。为避免在步序转换瞬间有些被检测电器的常开点闭合，致使故障指示出现短暂的错误，可根据需要设置若干个定时器，使步转换时间相同且有间隔的步共用一个定时器。定时器的常开点串联在相应的步序段中，时间设定值略大于步转换时间，这样就不会出现错误的故障指示。若在每一步序段中设置一个由PLC内部辅助继电器组成的步序状态指示器，将指示器的常开点与上述定时器的常开点和故障输出继电器串联起来，就可实现利用步序状态指示器对该步进行故障检测。只有系统运行到该步才能检测出有关的故障电器。

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