People say “industrial IoT” and then point at a box. A useful map says which box holds the machine signal, which box changes protocol, and which system stores the result.
This page uses three editorial layers: device, gateway and platform. They are a sketch for reading other documents. They are not a deployment, not a customer site, and not a measured network.
The OPC Foundation describes OPC UA, released in 2008, as platform-independent, from an embedded controller to cloud infrastructure, with information modelling, encryption, authentication and auditing. A packaging information model can use that layer. The PackML companion (OPC 30050 v1.01) is an additional specification, discussed in OPC UA packaging data. Putting OPC UA on the diagram does not mean every device in a plant speaks it.
Do not add a latency number, a brand of gateway, or a factory name. None was measured here. Security goals stated by the OPC Foundation are design goals, not a finding that a given cabinet is configured.
Machine-state names stay in the PackML guide. The section home is Industrial Connectivity.
Method and sources
The layer names are editorial. The OPC Foundation OPC UA page and the OPC 30050 contents were read on 14 October 2026. No plant diagram was copied.