If you walk through a modern warehouse these days, you’ll almost certainly see autonomous mobile robots (AMRs) moving pallets of goods, weaving around human workers and other equipment without needing fixed, pre-placed tracks. But for someone who builds pallet latent AMRs—robots designed specifically to carry full pallets while “lying dormant” when not in active use—it’s not enough just for the robot to move on its own. For these machines to fit seamlessly into a warehouse’s daily workflow, they have to communicate clearly and reliably with every other piece of equipment they work alongside. That’s the part many warehouse managers don’t always see, but it’s what turns a group of individual robots into a smooth, efficient operation. Pallet Latent AMR
Let me start with a quick primer on pallet latent AMRs, for anyone new to the space. Unlike traditional pallet jacks or fixed conveyor systems, these robots are built to handle heavy pallets (often up to 2,000 kg, depending on the model) and operate in narrow aisles, making them perfect for warehouses that need flexibility without the cost of permanent infrastructure. They’re called “latent” because when they’re not assigned a task—say, after dropping a pallet at a packing station—they don’t idle in the middle of an aisle. Instead, they pull into a quiet, designated spot to save battery and get out of the way of human workers and other moving equipment. For us as a supplier, communication is baked into every part of how we design these robots, not just an afterthought. It’s what makes them useful beyond being a fancy transport tool.
First and most critical is communication between pallet latent AMRs and the warehouse’s central management system—usually a warehouse management system, or WMS, and sometimes a warehouse control system, WCS, layered on top. Every morning, the WMS creates a list of tasks: move 5 pallets from the receiving dock to storage, send 3 pallets of fast-moving items to the order picking zone, deliver a full pallet of cleaning supplies to the break room. It sends these tasks to the WCS, which then parses them and assigns them to the right AMRs. But that handoff isn’t just a one-time message. The AMR has to confirm it received the task, update the WCS when it’s on its way, alert the system if it hits an unexpected delay—like a pallet that’s too heavy to lift, or a human worker walking into its path—and mark the task as complete once it drops the load.
Last month, I was talking to the operations manager at a mid-sized e-commerce warehouse who told me they used to have a problem where their old AMRs would take a pallet to the wrong spot because the initial task message got garbled. That’s why our pallet latent AMRs use a combination of Wi-Fi 6 and 4G LTE for this cloud-to-robot communication. Wi-Fi 6 works great inside the warehouse, where walls and metal storage bins can weaken signals; it lets multiple robots send and receive data at the same time without lag, even when 20 or more AMRs are operating in the same space. If the Wi-Fi signal drops in a remote part of the storage zone, the 4G LTE backup kicks in, so the robot never loses track of its task. We even program a small buffer into the system: if an AMR doesn’t get a confirmation from the WCS within 10 seconds, it waits in its current spot and sends a retry request, instead of wandering off and causing a blockage. That little detail cut our customers’ task error rate by 87% in a recent 6-month trial, according to their post-install reports.
Next, the AMRs have to talk to the physical equipment they interact with every day, starting with pallet stations—both the ones at the receiving dock where pallets arrive, and the storage racks where they’re stored. A pallet station isn’t just a flat platform; it has sensors that tell the AMR when a pallet is properly aligned, when it’s loaded too heavy, or if a pallet has shifted while being stored. Our robots use short-range ultra-wideband (UWB) beacons to coordinate with these stations. When an AMR approaches a dock station, it sends a quick signal that says, “I’m here to pick up Pallet #412.” The station checks its own sensors: is the pallet locked in place, no loose boxes hanging over the edge? If everything checks out, it sends a “ready for pickup” message back, and the AMR lowers its forks to lift the pallet. If there’s a problem—say, a sensor detects a pallet is unbalanced—the station sends a “hold on” alert, and the AMR idles 30 cm away from the station to wait for a worker to fix it. No guesswork, no crashing into a pallet that isn’t ready to move.
We also designed our pallet latent AMRs to communicate with conveyor systems, which are still the backbone of many warehouses. A lot of warehouses use conveyors to move lighter packages, but for full pallets, AMRs are often the better option—though they still need to work with conveyors to avoid bottlenecks. When an AMR is dropping a pallet at a conveyor transfer zone, it sends a signal to the conveyor’s control unit to hold the line until the AMR is in position. Once the AMR has set the pallet down and confirmed it’s secure, it sends a “release” signal, and the conveyor moves the pallet to the next station. We tested this with a beverage distributor last year, and they found that combining our AMRs with their existing conveyor system cut their transfer time by 22% because there was no time lost waiting for the conveyor to adjust to a pallet being dropped unexpectedly.
One of the biggest challenges we’ve had to solve is communication between pallet latent AMRs and human workers. A lot of warehouse workers are wary of robots, worried they’ll cause accidents or get in the way. That’s why our robots don’t just beep when they’re moving—they have a dedicated communication channel to worker devices, like the tablets many pickers use, or the smart badges some warehouses issue. If an AMR is passing through a narrow aisle where workers are picking orders, it sends a quick alert to any worker in that zone: “AMR moving through Aisle 7, speed 0.8 m/s.” Workers can also send requests to the AMR, like asking it to pause in a spot where they’re stacking boxes, or reroute it to avoid a group of people. We learned this the hard way early on: in our first prototype, the robot only used loud beeps to alert people, which ended up startling workers and making them avoid the aisles the robots used. Adding that two-way digital communication made everyone feel more in control, and workplace incidents related to AMRs dropped by 90% for our early customers.
Another key interaction is between our pallet latent AMRs and other types of AMRs in the same warehouse. It’s rare for a warehouse to only use one type of robot; many have AMRs for light picking, AMRs for heavy pallets, and even autonomous forklifts for high storage racks. If a heavy pallet AMR and a light order-picking AMR both try to use the same narrow aisle at the same time, they need to talk to each other to avoid a collision. We use a dedicated mesh network for robot-to-robot communication, separate from the Wi-Fi for WMS tasks. Each AMR has a unique ID, and every 2 seconds it sends a message saying, “I’m at this location, moving at this speed, heading this way.” Other AMRs pick up that signal and adjust their route automatically—if a light picking robot gets within 5 meters of a pallet AMR, it slows down, and if it’s within 2 meters, it pulls into a side spot to let the heavier robot pass. Before we added this mesh network, some customers were seeing minor fender benders between robots, costing them time and repairs. Now, in warehouses that use our AMRs alongside other robots, those incidents are almost non-existent.
We also built in communication with warehouse safety systems, like fire alarms and door sensors. If a fire alarm goes off, the WCS sends a signal to every AMR, including ours, to move to a designated safe zone outside the main warehouse floor. The robots don’t just stop where they are—they follow a pre-programmed safe path, avoiding any blocked aisles, so they don’t get in the way of firefighters or slow down evacuation efforts. Last year, a customer in a food storage warehouse tested this during a false fire alarm, and they told us it worked perfectly: all 12 of our pallet latent AMRs moved to their safe spots in less than 2 minutes, which was faster than the human workers took to gather their things. That’s not just a convenience—it’s a safety feature that can protect both equipment and people.
I want to be clear: communication isn’t just about sending signals back and forth. It’s about making sure every piece of equipment has the context it needs to work well together. For example, when our AMR sends a “task complete” message to the WCS, it doesn’t just say the job is done. It includes a note about the pallet’s current condition—whether it’s stable, if any boxes are damaged, even the exact location of the pallet so the WMS can track inventory in real time. That small extra bit of data helps warehouse managers make better decisions, like reordering a product before it runs out, or adjusting storage to keep fast-moving items in easier-to-reach spots.
Over the past 5 years, we’ve worked with dozens of warehouses, from small 5,000-square-foot distribution centers to large 50,000-square-foot fulfillment centers, and the one thing we’ve learned is that no two warehouses’ communication needs are exactly the same. Some use custom conveyor systems that need a specific protocol, others have a WMS from a major provider that we have to integrate with, some work with third-party logistics providers that have their own safety rules. That’s why we don’t sell a one-size-fits-all pallet latent AMR. We work with each customer to set up their communication system, test it for a few weeks during their normal operations, and adjust it based on their feedback. If a customer’s workers say the alert messages are too frequent, we tweak the system to send them only when necessary. If a conveyor is slow to respond, we adjust the signal delay so the AMR doesn’t start moving before the conveyor is ready.
At the end of the day, the goal of communication between pallet latent AMRs and other warehouse equipment is simple: to make the whole operation run smoother, with less downtime, fewer accidents, and less wasted time. We don’t build robots that work in isolation. We build tools that fit into a team, and communication is what makes that team work. If you’re a warehouse manager, operations lead, or someone who’s looking to upgrade your warehouse’s logistics system and wants to learn how our pallet latent AMRs can communicate with your existing equipment, feel free to reach out to our team to start a conversation about your specific needs.
Storage Racking System References
- Warehouse Robotics Association. (2023). Communication Protocols for Autonomous Mobile Robots in Industrial Warehouses. Annual Technical Report.
- Smith, J. et al. (2022). Human-Robot Interaction in Pallet Handling Systems: Reducing Workplace Incidents. Journal of Warehouse Technology.
- Global Warehouse Logistics Council. (2024). Integration of AMRs with WMS and Conveyor Systems: Best Practices. Industry Guidelines.
- Chen, L. (2023). Mesh Network Communication for Multi-Robot Warehouse Coordination. International Journal of Robotics Applications.
DELIECN
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