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BobLfoot.. There is something to be said about simplicity.. less points of failure in logic and easily modifiable as things evolve. Im kinda ashamed that i didn’t consider this option and it may very well be the thing to do. Great suggestion! 

This will likely be my simplest and chosen way to go as i can use the same timer data to show upcoming bin calls and their time lapse on the hmi. Thank you for the suggestion!

BobLfoot, Thank you for the time you spent with this response. I was not aware of the FIFO operation in productivity or what it did as I have only very briefly browsed the software today. This is exactly what I needed and Im going to explore it with some other ideas using timers that start when a call comes in..  reading those timers and prioritizing before starting the next fill operation. Currently all of our bins have high level sensors only and are what is being used to keep all bins topped off. I advised them to install low level sensors so we can catch any failure to fill issues but since that isnt being done I will probably just setup timers on each that indicate a possible failure to maintain material in the bins when the high level sensors dont show a full bin after x amount of minutes of filling, being stuck in bin call queue or not ever receiving a bin call. Thank you again for the thorough response! 

Good evening. I am building a system that will need to turn on outputs based on the order in which inputs were turned on. For example.. if there are 4 inputs and 4 outputs.. and input x2 was turned on first, then x4, x3 then x1.. it needs to turn on y2,y4,y3 then y1 in that order after each operation is complete. This order will change constantly based on which machines are active and needing material. I am having trouble finding the right terms or something to search for ideas on how to do this so if i had that I will gladly continue to seek out the rest of what i need to know from there.. but i am also open to some input as to how to do this with the Productivity 2000.  Just to elaborate on what is happening.. This is for a raw materials conveying/handling system. We have 4 blowers, 4 silos and a series of diverters all running to 9 different bins. When the high level switches in each bin signal the plc that they need material.. the plc needs to add that "bin call" to some sort of list or voting system and send material to the appropriate bin in the order that the bin call was received. Bin 6 sends signal and material begins to go to bin 6.. in the meantime while bin 6 is filling, bin 4 sends a signal and then bin 7 also sends a signal. The system needs to know that when bin 6 is full, to go to bin 4, then when 4 is full to go to bin 7 in that order.. or whatever order that the bin calls were received. Right now the current system that I put into place about 6 years ago simply chooses based on the location in ladder logic that each bin operation is, the further down the list the less priority that bin gets to get material no matter how long it has been waiting. This has been working fine up until now as i am conveying material faster than it can be used, but we are near doubling the number of ribbon blenders and material bins requiring material and this could leave some bins without hardly ever getting material so long as those listed earlier in the program are requesting material. I hope this makes sense, thank you for any info or direction to solve this.