About point extensions

As needed, you can add one or more extensions to a point, each as a child of the point. Extensions add functionality to a point (or extend it) in a modular fashion.

Extensions are found in several palettes, including alarm, control, history, and kitControl. Point extensions include the standard proxy extension (one for each point) and also optional extensions.

There are three main categories of optional extensions:

  • Control extensions come from the control palette.

  • Alarm extensions come from the alarm and kitControl palettes.

  • history extensions come from the history palette.

You typically add an extension by either:

  • dragging it into the Property Sheet of the point, or

  • dropping it on the point’s icon in the Nav tree.

A point’s Property Sheet lists extensions below its normal (frozen) properties. You can expand each extension to view and modify its properties.

Figure 1. Extension expanded in a point’s property sheet


The screen capture shows the properties for a Numeric Interval History extension that has been added to a numeric point (MidPoint).

If a point has multiple extensions, the station processes them in the same top-to-bottom order that they appear listed in that point’s Property Sheet . To re-order extensions from the top of the point’s Property Sheet, or on the point’s icon in the Nav sidebar, right-click and select Reorder.

Note: If needed, you can also select and expose extension properties (for linking convenience) on the point’s glyph by using the Composite editor of the parent point.