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Thanks b_carton i managed this to work but looking deeper into the project i have had a change of mind, feeling like it could get to complex. so i have decided to create down tablet bottle detection using bit shift and an encoder just worried that this could be too simple.

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As im using 1 sensor (conveyor input) to count up and 4 sensors (conveyor output) to count down, could i use 4 separate CTD's and then use maths to add the accumulative total (CTD1acc+CTD2acc...) , Then Somehow add CTU0. along with that assigning the relevant outputs, its all a bit hazy  

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18 hours ago, b_carlton said:

If multiple down counts occur simultaneously what do you expect as behavior? Will just one down count be appropriate?

No it needs to count all items moving passed all four sensors, OR'ing the four inputs does not work accurately, not sure how to solve this one 🤔

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Hi, How would i go about using one input for the up count but multiple inputs (say 4 inputs) for the down count. Many thanks in advance. :)