Sometimes the type of entity, its quantity, and timing for sending entities must be precisely controlled. This may occur where the pull or kanban signal depends on a unique situation that isn't a matter of simply constraining buffer capacities or replenishing a buffer based on a drop in inventory. Perhaps it is based on conditions that change during the simulation. Whatever the case, situations arise where you need precise control over what entities get sent where and when. For example: In a make-to-order process the manufacture and subsequent assembly of a product doesn't begin until an order is received. The facility makes two different products (A and B). Product A requires 1 component X and 2 component Y. Product B requires 1 component Y and has 2 component Z. The component parts wait in their respective inventories until an order is received.
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