BOX identification problem on conveyor belt

Hello,

It is possible to implement this simple idea even in LAD , If it is real industrial application, I can not comment for feasibility but in your program you can include:

1. Initialization should happen by operator command and empty conveyor.
   
   
2. Keep 2 different sets of 5 bytes data for saving of temp table and final table.
   
   
3. Detect new object by positive edge in sensor1 for object A and sensor 2 for object B (or 1/2 for differentiation of type of objects).Keep the new object in variable Newcomer.
   
   
4. Negative edge of exit sensor will shift up cells from temp table to the final table like 1-->2,2-->3,3-->4,4-->5 and finally newcomer-->1 in final table.
   
   
5. Copy the finalized table to temp
   
   
6. New cycle starts again by a positive edge in sensor 1/2 , for that skip to stage 3 again.

Try to implement your program and share here for our judgement.

I hope this helps,

hdhosseini

I need to know how to shift cells with sensor 1 ,sensor2 and sensor 3.

As mentioned when there is a negative edge in sensor 3 , you should copy from table temp to the final table like copying cell#2 from temp to cell#3 to final table as shown in the attached file.It is possible by simple move function. Another point, you need an extra information like machine timing as a pulse to find out lack of boxes for a long time.