Line control help

[dah79]

I have a line control project that I am trying to duplicate. I have a DoMore H2-DM1E along with a H2-CTRIO2 module.  The machine is a edge profile sander with 5 sanding heads.  There is an encoder on the feed track and a proximity switch at the infeed to sense the parts.
What I need to do is to measure each part as it crosses the prox switch and keep track of the part and measurement as it travels down the track and have the sanding heads jump in and out when the part reaches each sanding head.  There will be multiple parts on the track at a time.
I am not well versed in FIFO’s and bit shifts, nor have I used a CTRIO module in this capacity.  I am looking for any assistance on this to get me started.  This was originally done on a A-B SLC 5/03, but the machine was out of commission long enough that the battery died and the program was lost.
Thanks