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 56. 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, wherenis a number from1to16. If the fallback value is in effect, the value is formatted as@ def, for example:Off {ok} @ 1.