西门子6ES7321-1FH00-0AA0

6ES7321-1FH00-0AA0

控制回路的一个识别；控制电路是由上看到下。主线出来的一组24V交流电源控，经过镇流桥将交流转化为直流，经过EC0803充电器给电瓶线充电，同时也提供控制模块的电源。

打开开关，按下一键启动按钮，此时模块的程序开始启动，启动时候步进电机转动，电磁阀有输出，然后一键启动开关的绿色灯会亮，此时停止可以按动一键启动开关 或者自总开关。总的来说就是启动开关控制闭合 给控制模块一个信号，然后模块上面的程序就开始启动。

后一个难点就是维修故障了，这一块面板经常一键启动开关容易坏，如果你在启动一键启动开关没反应的时候可以将内部的黄线和蓝色两根线连通，看是否有反应。

如果正常启动了 就是开关坏了，开关的作用就是连通和断开电路。任何复杂的电路的攻克点都是先将复杂电路简单化，将线路一条一条的分解出来，逐一排查，强电电路由下往上找问题，比如电源灯不亮了。

可以用万用表打到交流750V测量灯两端是否有电压值，有电压灯不亮 则是灯坏，无电压在往上逐渐排查；弱点电路故障排查是从上往下找，先看这个回路的电源哪里来 ，比如模块无启动，可以先用万用表测试模块电源是是否有电压输入在按上述方法如法炮制排查。

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