About each point’s Out property

Each point has input properties and a single output property (Out)

A point’s Out property provides real-time information.

Figure 1. Point Out provides real-time information


At a minimum, the Out property provides:

  • A current value that conforms to one of four possible data categories.

  • Facets, which define how the value displays. This information includes the value’s number of decimal places, engineering units, or text descriptors for Boolean/enum states.

  • The current status of the data item, meaning the health and validity of the value. Status is specified by a combination of status flags, such as fault, overridden, alarm, and so on. If no status flag is set, status is considered normal and appears with the default status of {ok}.

    Status flags are set in a number of ways.

  • The currently active priority level (from a 16-level priority scheme) for writable control points only.

    The writable point’s priority appears at the end of the Out value. By default it is formatted as @ n, where n is a number from 1 to 16. If the fallback value is in effect, the value is formatted as @ def, for example: Off {ok} @ 1.