Automated storage and retrieval system reducing bin moves by selecting multi-stock bins containing highest number of skus on workstation stock waitlist

Abstract

An automated storage and retrieval system stores multi-stock bins each holding different stock-keeping units (SKUs). Records dynamically track which SKUs are in each bin. A controller tracks a stock waitlist indicating quantities of SKUs still required to be delivered to a workstation in order to fulfil current orders assigned to the workstation. When a robot is available, the controller selects a multi-stock bin that has a highest number of unique ones of the required SKUs indicated on the stock waitlist and commands the robot to fetch and deliver the selected bin to the workstation. For new orders, the controller may determine if direct assignment can be done to a workstation without additional bins being scheduled. For other pending orders, the controller may assume each pending order is assigned to the workstation and then pick the order that would require a lowest number of bins to be delivered to the workstation.