A device extension is a child of a device, and represents some functionality of the device. Each extension contains properties and other components. Device extensions are container components, often with one or more special views. For more details, see Types of device extensions.

For example, in any of the field bus networks, each device has a Points extension, the parent container for proxy points. The default view of the Points extension is the Point Manager, which you use to create and manage proxy points. See Point Manager for details.

Device extensions are required (frozen) components of a device—you cannot delete them. They are created automatically when you add a device to the station database. This varies from the “point extension” model, where you individually add/delete extensions under control points and components.