How to store analog values

Hello Everyone,

It's my first time using Logo 0BA8, and i need your help to overcome some problems.

im working on a project that detect/eject dammged goods in  a production line, using two TOR sensors (Ejection zone/Detection zone) and two counters, one for each sensor.knowing that the ejection zone is far from the detection zone, so i need to store the index (first counter's value) of dammaged products.

According to the detection process and the production line cadences, i need to store at least 4 values.

I've already tried something, but it didnt work: I added a third counter that reset after every 4 dammaged products.

What do you think ? Any ideas?

Thank you :)