Explore the flow
One order. Four stages.
Select a stage to follow the exchange between systems and the movement of a load.
1 / 4 · WMS
Order
The WMS specifies what needs to happen: which load to move and its requested destination.
Illustrative logical flow. Interfaces and responsibilities are defined for each project.
From intent to movement
A Warehouse Control System coordinates physical execution in automation. An outbound request is not yet permission to move a carton: identity, route eligibility, destination capacity and transfer conditions must first be established. The boundary changes when a separate WES or MFC owns some decisions.
The WMS usually owns inventory and business destinations. The WCS owns execution context, while PLCs perform local sequences. Machine safety remains within the appropriate safety architecture. Sharing a network does not merge these responsibilities.
Explicit task states
A reference lifecycle might include received, validated, released, executing, completed and exception. Every transition needs evidence. Sending a command does not prove movement; an occupied sensor does not establish load identity. Completion must relate the task, load and agreed delivery point.
Separate message identity from task identity. One task generates several messages, and one message may arrive repeatedly. Consumers must recognize duplicates without creating another movement. Order versions prevent an old update from overriding a newer decision.
Routing with finite capacity
The shortest path may lead to a saturated destination. Consider reservations, restrictions and priority alongside distance. Buffers absorb variation; they do not increase the bottleneck capacity. Unlimited release can prevent urgent loads from reaching their destinations.
Define what happens when no route is eligible: wait at a known position, restrict induction or use an authorized exception route. Unlimited recirculation consumes capacity and conceals the cause.
Worked scenario and acceptance
Task T42 sends carton C18 to S3. S3 becomes unavailable before diversion, so C18 enters an authorized buffer while T42 remains open. When S3 recovers, the same task continues. A repeated T42 must return its existing state, not create a second movement.
Require one completion supported by delivery evidence. Measure queue time, movement time, exception age and disagreement between logical state and physical observation. Average throughput alone cannot reveal abandoned loads.
Project verification criteria
- Repeat a request and verify that no second physical task appears.
- Block a destination during transit and check reservations and WMS feedback.
- Restart with an open task and reconcile before issuing commands.
Examples describe engineering decisions and test scenarios. Implemented interfaces, limits and features are defined by each project’s scope.