Absolute Optical Encoder

Replies

• 

  Jeffrey Arulraj

  priority encoding comes into play here otherwise sub dividing the sectors into finer divisions is the only probable answer
• 

  John Bradford

  Thank you for the reply. In this case, I am not quite sure if I understand what you mean by priority encoding? The question goes like this for this particular case:
  
  At which sector transition is there an out-of-alignment photocell?
  Sector3 to sector4
  Sector4 to sector5
  Sector5 to sector6
  Sector6 to Sector7
  
  I guessed it as the Sector5 to Sector6. Is this right?
  
  Thanks again for further help.
  
  John
• 

  Jeffrey Arulraj

  I am not sure what is the problem you are facing actually If you have to encode and there are more than 1 input at a single time we go for prioritisng the sectors so that the one having higher priority is executed than the one having lower priority
• 

  John Bradford

  I am very sorry for badly placing the question. In fact, to help me understand this "alignment" or "out-of-alignment" of the encoder, I tried to do get an answer to the following problem:
  
  ********************************
  An absolute optical encoder presents the following data:
  Sector3 (011)
  Sector4 (001)
  Sector5 (011)
  Sector6 (110)
  
  At which sector transition is there an out-of-alignment photocell?
  Sector3 to sector4
  Sector4 to sector5
  Sector5 to sector6
  Sector6 to Sector7
  **********************************
  
  The thing is that, the fact that I don't know for sure the answer to the above problem, it means I didn't understand the concept behind it. That's why I first would like to know the right answer to this problem, to help me further in this matter. Of course, I do appreciate your explanation, but how it can be applied in the above problem? The question asks, "At which sector transition is there an out-of-alignment photocell?" My answer by guessing is "Sector5 to sector6." But, is that right?
  
  Thank you very much again for further help.
  
  John
• 

  John Bradford

  Steven Brooks:
  
  Thank you for the reply. It seems you know things about this. I will keep the information you've given me now. Also, I wonder if you could kindly help me identify "the sector transition" where the out-of-alignment photocell accurs in the problem, please. I guess (just a guess) it is Sector5 to sector6. Am I wrong?
  Many thanks.
  
  John