评论12

• 

  ytzidonghua

  楼主 2008/10/27 18:34:25

• 

  liming315

  楼主 2008/10/27 22:44:41

• 

  bubli

  楼主 2008/10/28 20:40:12

  开开得开，开闭得闭，闭闭得开

• 

  hq0769

  楼主 2008/10/28 22:21:11

  在PLC里面，数字量就是1或者0两种状态，先不管常开常闭。

  
  

  是0的话，外部电路状态不变。

  
  

  是1的话，对应外部电路----->常开闭合，常闭打开。

  
  

  有些时候编程人员为了方便，本来外部电路是常闭的，程序里面写成常开。

  
  

  熟悉了就好。

• 

  julian2008

  楼主 2008/10/29 16:29:48

• 

  msj0118

  楼主 2008/10/30 11:50:06

• 

  218hty

  楼主 2008/10/30 23:48:22

  主要是在实践中学习才能够做到真正的理解。并且理解的还要快。

• 

  zcciacmall

  楼主 2008/11/1 9:13:00

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• 

  zcciacmall

  楼主 2008/11/1 9:15:12

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• 

  xxkjfw

  楼主 2008/11/1 22:18:55

  是不是只扣积分，不删帖?