Input points

Input points record data that interfaces receive from data sources and send to Data Archive. Input points can be scan-based, unsolicited, or trigger-based, and use the location4 attribute in the following ways:

Scan-based input points

Values are sent to the points at the frequency configured for the point’s scan class. To assign a scan class to a point, set the location4 attribute to a scan class. Scan classes are defined with the f parameter. For more information about the scan class parameter, see Standard parameters.

Unsolicited input points

Some interfaces do not poll for data, because the data source controls the timing of data sent to the interface. For details about configuring such unsolicited input points, refer to the interface documentation. Because these points are not scanned, the location4 attribute should be set to 0.

Trigger-based input points

Trigger-based input points are updated when a new value is sent to the snapshot of a specified trigger point. Because these points are not scanned, the location4 attribute should be set to 0.