Characteristics of the Rdbms Point Device Extension
Starting in NiagaraAX-3.4, the Rdbms Point Device Extension is present as a child component of all Rdbms Database Device Components.
The Rdbms Point Device Extension
is similar to other Device Extensions in some ways but is unique in several ways.
The following is a list of similarities. Like other Point Device Extensions, the Rdbms Point Device Extension:
- is a required (frozen) slot on the Rdbms Point Device component - it's always there, you cannot delete it.
- displays as a typical "Points" node
under its appropriate RdbmsNetwork driver.
- is a container component, having several special views.
- is a parent of proxy points.
- has a default manager view (the Rdbms Point Device Ext Manager view) and uses Discover, Add, and New buttons to add proxy
points.
Unlike other Point Device Extensions, the Rdbms Point Device Extension:
- has a unique default view - the Rdbms Point Device Extension Manager view.
- has a unique child component - the Rdbms Point Query component.
- has proxy points under the Rdbms Point Device Extension that are read-only; you cannot write to the Rdbms using these points.
- has proxy points under the Rdbms Point Device Extension that use recorded database values not "live" values. It is possible
to have points from the database update very frequently, depending on database archiving and updating parameters, but the
data is always coming from a "secondary" source - the database, not a control point.
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