question

@Don C2

In 19.2 there are some better ways to do what you are looking for, but for your version we can take an approach where a List is used to control the availability of cells in your racks.

The attached model includes a Fixed Resource process flow that is attached to a rack like your CMA Flow objects. It uses tokens to represent each Bay/Level combination for the rack and pushes them to a List to signal their availability.The tokens are a assigned a capacity from a label on the Rack.This assumes that all cells will have the same number of items in them.When a cell’s capacity is reached it goes to a Decide activity that just holds the token until its content is less than its capacity.

The Incoming Items section of the process flow creates a token for a pallet ready to be unloaded into the rack, and then creates child tokens for each item in the pallet.Those child tokens then search for an available cell preferring the highest level first then the lowest bay.When a cell for the item is found, it is recorded by Bay/Level into labels on the item. A task executer is acquired, and it transports to the box to the Rack.The Rack reads the Bay/Level labels to know where to place it.

The Outgoing Items section monitors when a flowitem leaves the Rack, updating cell contents and releasing the cell token back to the list if needed.

Have a look and see if this is what you are looking for and let me know if you have questions about it.

Edit: Mistake in the uploaded model. Fixed Model here:

listcontrolledrack-2.fsm