Associated with: WITS Points.
The Scanning attribute shows whether the individual point is On Scan or Off Scan.
You can take a Field Device and a point Off Scan separately. Therefore, the attribute also shows if the source of the Off Scan is the Field Device, the Field Device and the point or just the point.
The possible states are as follows:
- On Scan
- Off Scan (Point)
- Off Scan (Outstation)
- Off Scan (Outstation and Point).
When a point is On Scan, the Field Device will log data and generate events for the point. However, this is dependent on the Field Device also being On Scan ((see Set a WITS Outstation to be On Scan or Off Scan)). If the Field Device is Off Scan, the point will also be Off Scan, irrespective of the point's own scan status. When a point is Off Scan, the Field Device will not log data or generate events for the point.
For more information about the point scanning states ((see Scanning States for WITS Database Points)).
You can define whether a WITS Point item is set to On Scan or Off Scan in its initial configuration. To do this, you select the Enabled check box in the Scanning section of the <Point Type> tab in the appropriate WITS Point Form ((see Scanning States for WITS Database Points)). You should then download the configuration to the Field Device ((see Download Configuration (WITS Outstation))).
To set a point to be On Scan or Off Scan, you use the On Scan (WITS Point) and Off Scan (WITS Point) actions.
Further Information