How does AS/RS infrastructure work alongside AMRs?

charlotte.ankers · 08 Aug 2026

AS/RS infrastructure and AMRs work together by dividing warehouse automation into two complementary functions: the AS/RS handles high-density storage and retrieval, while AMRs manage flexible transport between the storage system and other areas of the facility. Together, they form a cohesive robotic warehouse system that combines storage efficiency with dynamic movement. The sections below answer the most common questions engineers ask when evaluating how to integrate these two technologies.

What roles do AS/RS and AMRs each play in a warehouse?

In a combined robotic warehouse system, the AS/RS is responsible for storing and retrieving inventory at high density, while AMRs handle the physical movement of goods between the storage system and downstream workstations, packing areas, or shipping docks. Each technology solves a different part of the fulfillment equation, and they are most effective when deployed for the tasks they are built for.

An automated storage and retrieval system excels at managing large volumes of totes or goods within a compact footprint. It keeps inventory organized, tracks every location, and delivers items on demand with minimal human involvement. The system’s strength is density and precision: it can utilize full building height, maintain direct access to every stored item, and process retrieval requests rapidly without requiring staff to walk aisles or search locations manually.

AMRs, by contrast, are designed for flexible horizontal transport across open floor space. They navigate dynamically, respond to changing conditions, and can carry goods between multiple points in a warehouse without fixed conveyor infrastructure. Their strength is adaptability: routes can be modified through software, and units can be redeployed to different areas as operational needs shift.

When deployed together, the AS/RS becomes the inventory backbone and the AMRs become the connective tissue. The storage system holds and retrieves; the mobile robots move and deliver.

How do AS/RS systems and AMRs communicate with each other?

AS/RS systems and AMRs communicate through a shared software layer, typically a warehouse management system (WMS) or warehouse execution system (WES), which coordinates task assignment, timing, and location data across both platforms. Neither system operates in isolation; they rely on a common data environment to synchronize their actions.

At the integration level, the AS/RS control system exposes its status and task queues through standard APIs. The AMR fleet management software does the same. A WES or WMS sits above both, receiving orders, sequencing tasks, and dispatching instructions to each system based on priority and availability. When an AS/RS completes a retrieval and delivers a tote to a handoff point, the WES simultaneously triggers an AMR to arrive at that location and collect the tote.

The quality of this integration depends heavily on API standardization. Modern AS/RS platforms are designed to connect with external systems through well-documented interfaces, which reduces custom engineering effort and makes it easier to swap or upgrade individual components without rebuilding the entire workflow. For engineering teams evaluating AS/RS infrastructure, confirming API compatibility with existing WMS platforms should be an early step in any project scoping process.

Where in a warehouse layout do AS/RS and AMRs hand off inventory?

The handoff between an AS/RS and AMRs typically occurs at designated transfer points, most commonly Goods-to-Person (GTP) workstations or buffer zones positioned at the perimeter of the storage structure. These locations act as the physical interface between the two systems, where retrieved totes exit the AS/RS and are collected by AMRs for onward transport.

The placement of these handoff points matters significantly for overall throughput. If transfer zones are too few or poorly positioned, they become bottlenecks regardless of how capable each individual system is. Effective warehouse layouts distribute handoff points to match the retrieval rate of the AS/RS with the carrying capacity of the AMR fleet, preventing queuing on either side.

In practice, there are two common layout patterns:

Centralized handoff: All retrieved totes exit the AS/RS at one or two primary stations, and AMRs queue to collect from those points. This simplifies control logic but can create congestion during peak demand.
Distributed handoff: Multiple exit points around the AS/RS allow AMRs to collect from different locations simultaneously, reducing congestion and improving throughput resilience.

The right approach depends on order volume, the number of AMRs in the fleet, and the physical constraints of the building. For high-throughput operations, distributed handoff points generally produce more stable performance.

What’s the difference between using AMRs versus conveyors with AS/RS?

The key difference between AMRs and conveyors as transport partners for an AS/RS is flexibility versus throughput predictability. Conveyors offer fixed, high-speed transport along predetermined paths, while AMRs provide reconfigurable routing that adapts to changing layouts and operational requirements.

Conveyors are well-suited to environments where the flow of goods follows a consistent, high-volume path. Once installed, they move items reliably at defined speeds without requiring additional coordination software. The tradeoff is rigidity: if the warehouse layout changes, production areas shift, or new workstations are added, conveyor infrastructure must be physically modified, which involves significant cost and downtime.

AMRs remove that constraint. Because they navigate autonomously using software-defined routes, their paths can be updated without touching physical infrastructure. New destinations, changed workflows, or seasonal reconfigurations are handled through the fleet management system rather than construction. This makes AMRs particularly valuable in operations that experience frequent layout changes, SKU variability, or growth that requires adding workstations over time.

The practical consideration for engineering teams is total system design. Conveyors integrate more simply with AS/RS systems that have fixed exit points, while AMRs require more sophisticated coordination software but offer greater long-term adaptability. In environments where throughput patterns are stable and volumes are high, conveyors may deliver a lower total cost of ownership. In environments with variable demand or evolving layouts, AMRs often justify the additional software investment.

When should a warehouse combine AS/RS with AMRs instead of using one system alone?

A warehouse should combine AS/RS infrastructure with AMRs when storage density and transport flexibility are both critical requirements that cannot be met by a single technology. If the operation needs to store large volumes compactly and also move goods across a complex or frequently changing floor layout, neither system alone covers both needs effectively.

Using an AS/RS without AMRs works well when the retrieval points are fixed and conveyors or manual picking can handle the downstream transport. But as operations grow, fixed transport infrastructure often becomes a limiting factor, particularly when new workstations, packing areas, or shipping lanes are added.

Using AMRs without an AS/RS can handle flexible transport but does not solve the storage density problem. AMR-based storage systems keep goods on low-profile shelving that limits vertical utilization, meaning more floor space is consumed per unit of inventory than a high-density vertical AS/RS would require.

The combination makes the most sense in these scenarios:

High SKU count operations where both storage efficiency and order variety demand separate, specialized systems
Facilities with limited floor space that need to maximize cubic storage while maintaining flexible transport to multiple workstations
Operations expecting significant growth, where the transport layer needs to scale independently of the storage layer
Omnichannel fulfillment environments where order profiles vary significantly between channels and fixed conveyor routing cannot accommodate all flows

How does adding AMRs affect AS/RS throughput and storage capacity?

Adding AMRs to an AS/RS deployment affects throughput but has no direct impact on storage capacity. The AS/RS determines how much inventory can be stored; the AMR fleet determines how quickly retrieved goods reach their next destination. Scaling one does not automatically scale the other, which is why the two systems are typically planned and expanded independently.

From a throughput perspective, the AS/RS has a defined retrieval rate based on the number of robots or cranes operating within it. If the transport layer cannot keep pace with that retrieval rate, goods accumulate at handoff points and effective throughput drops. Adding AMRs increases the system’s ability to clear those handoff points faster, which allows the AS/RS to operate closer to its maximum retrieval capacity without creating backlogs.

Conversely, if the AMR fleet is sized correctly but the AS/RS retrieval rate is the constraint, adding more AMRs produces diminishing returns. The bottleneck shifts to the storage system itself, and the solution is to add retrieval capacity within the AS/RS rather than more transport units.

This distinction matters for capacity planning. Engineers designing combined systems should model the throughput rate of the AS/RS at peak demand, then size the AMR fleet to match that rate with a reasonable buffer. As volumes grow, both layers should be evaluated separately to identify where the constraint actually sits before investing in additional units on either side. AS/RS technology that separates storage capacity from retrieval throughput makes this planning more straightforward, since each dimension can be expanded without redesigning the other.

How Hexxabotics helps with AS/RS and AMR integration

Hexxabotics is designed to serve as the high-density storage core in a broader robotic warehouse system, integrating cleanly with AMR fleets and external warehouse management platforms. Its architecture addresses the key challenges that arise when combining AS/RS infrastructure with autonomous mobile robots:

Independent scalability: Storage capacity and retrieval throughput scale separately, so the AS/RS layer can be expanded without forcing changes to the AMR fleet or transport infrastructure.
Standard API integration: The Hexxabotics Control System connects with external WMS and WES platforms through standard interfaces, reducing custom engineering effort when integrating with AMR fleet management software.
Distributed retrieval points: The system’s architecture supports multiple handoff locations, which reduces congestion at transfer zones and allows AMR fleets to collect from different points simultaneously.
No in-rack electrification: The passive rack structure simplifies installation and relocation, making it easier to reconfigure handoff point positions as the AMR workflow evolves.
Resilient operation: Distributed Hexxabots eliminate single points of failure, maintaining stable retrieval rates even during peak demand so the AMR fleet receives a consistent flow of goods.

If you are evaluating how to integrate a high-density AS/RS into a warehouse that includes or plans to include AMRs, contact Hexxabotics to discuss your specific layout, throughput requirements, and integration approach.