fifo ordering conveyor

hi

i'm having a big problem to solve this system
I have 3 user and load cell witch send 20kg on conveyor belt to an gate for each user. Each user have a ordering knapp so they will get 20kg (set point in system)

I have a big problem with fifo, how can i send from fifo to user ??

First off, the load and unload must be addressed to the same control (R6:x) register. You've used R6:0 to load and R6:1 to unload. Choose one or the other and use it in both instructions.

Is the operator's request simply a way of telling the system that he's ready for work?

you wrote (how can i send from fifo to user ??)

It is not clear to me what this means.