FIFO indexing

[lavito1960]

Good morning,
I am interested in using FIFO to use for a magazine rack that uses a loader to load part in a slot and index each subsequent part to an empty rack while tracking which slots are empty and what parts are already in the slots and track when they are unloaded. I know I need to setup an array as well as using FLL and FFu but not quite sure how to accomplish this. Any assistance would be greatly appreciated.

 

[drbitboy]

seach for fifo on this forum; there are plenty of examples. FFL and FFU usually work best when the load and unload point are fixed, but there are exceptions. If only the presence or absence of a magazine needs to be modeled, then BSR or BSL will do the job; if the there is some property of each magazine that can be tracked with an INT, then FFL/FFU are probably the way to go.


With both FFL/FFU or BSR/L, note that a rising edge of some bit is what triggers shift, so shift events must occur at least two PLC program scans apart.

 

[janner_10]

This guy makes decent videos:

https://www.youtube.com/watch?v=n1mCGaTiflg&ab_channel=ShaneWelcher

 

[lavito1960]

Thanks janner10, I will look at them

 

[lavito1960]

I can't thank you and the guys enough for taking the time to help me