Use the Retrieval Intervals section of the TBox tab to determine how often the driver polls a TBox outstation to retrieve its point data:
- Normal 1 to Normal 8: Specify the frequency with which the driver polls the outstation for point data. You can specify up to eight different polling intervals.
Enter the required interval in the OPC Time Format. You can enter the value directly in the field, or use the Interval window (accessed via the field's browse button) to specify the required value.
- Promoted 1 to Promoted 8: Specify the frequency with which the driver polls the RTU for point data when scanning is promoted. You can specify up to eight different polling intervals. Each Promoted frequency replaces the corresponding Normal frequency while scanning is promoted for the controller. For more information, see Temporarily Increasing the Scan Rate in the Geo SCADA Expert Guide to Advanced Drivers, and see Define Whether an Outstation is Promoted While its Points are on Display in the Geo SCADA Expert Guide to Advanced Drivers.
Enter the required interval in the OPC Time Format. You can enter the value directly in the field, or use the Interval window (accessed via the field's browse button) to specify the required value.
To define which of the eight Normal/Promoted intervals is used for a particular point, use the Retrieval Interval field on the <Point Type> tab of the corresponding TBox Point Form (see Points Used on TBox Outstations).
Example:
An Analog Point on a TBox outstation has this configuration:
Retrieval Interval:5
The Outstation includes this configuration:
Normal Retrieval Interval 5:8S
Promoted Retrieval Interval 5:4S
The Promote when Displaying Points check box is selected.
Geo SCADA Expert scans the TBox outstation every eight seconds for the Analog Point data.
A Mimic that contains a point from the TBox outstation is displayed on one of the ViewX workstations.
While the Mimic is on display, scanning of the controller is promoted. While scanning is promoted, Geo SCADA Expert scans the TBox outstation at four-second intervals for the Analog Point data.