racks.fsmin this model,why some rack slots cant be assigned? but these slots have space.
thank you for your help in advance
You have to give the system time to evaluate size and hasSpace. If you need to prepare your system, then you can use a warmup time. Attached model works a bit differently. It queries slots randomly and limits an result to only one slot.fill_rack_query_slots.fsm
To provide some more detail about what is happening here:
The Send to Port option of the source sends the item to a random available port. The input of a rack is going to be open (and thus 'available') as long as the maximum capacity is not reached, regardless of how many items are placed in each slot (because the size of the next item is not known, so the system can't know beforehand if there is space in the rack for it or not). So what can happen is that the source sends the item to a rack in which there isn't any space for the item, so the item is not pulled by the rack and further output of the source is blocked.
To use all slots, either assign a random slot beforehand and release it to the respective rack as Jörg suggests. Or set the maximum capacity of the racks according to how pallets fit in the slots (56 for the larger racks, 16 for the small one).
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