The Purdue Model is an architectural framework that organizes industrial systems into hierarchical layers from enterprise functions down to physical process control.

Key Points

It separates enterprise and operational layers.
It gives architects a simple model for segmentation and trust boundaries.
It is widely used in industrial security discussions.
It helps place firewalls, gateways, and monitoring controls.
It is a reference model, not a complete implementation.

Concept

The model is useful because it turns a complex industrial estate into understandable zones and interfaces. Security controls, gateways, and segmentation choices can then be placed according to function rather than ad hoc convenience. That is why it remains influential even though real systems often deviate from the textbook layers.

Explainer

In practice, the Purdue Model is used to reason about where traffic should flow and where it should be blocked or inspected. It is not a magic security control; it is a design lens. Its value comes from helping engineers and operators agree on which systems belong together and which interfaces need explicit protection.

Cite this entry

Purdue Model. ConnectedEarth Knowledge Base. https://connectedearth.space/knowledge-base/purdue-model/ (updated 13 September 2026).