Device group definitions

The Device Groups configuration view is used to add, clear, rename, delete, import, and export device groups. It has the following two columns:

• Name: alias name to the actual data source items.

• Update Interval (ms): frequency, in milliseconds, that the WEBSVC Communication Driver acquires data from the topics associated with that device group.

Different topics can be polled at different rates from a PLC by defining multiple device group names for the same PLC and setting a different update interval for each device group. For more information about automatic (time-based) and trigger-based (on-demand) polling, see Trigger a Web Request.

Note: Enter a unique name for each new device group added/created.

Create or add device groups

1. Right-click anywhere in the Device Groups configuration view, and select Add.

   A device group is created, and it is numerically named by default. For example, Topic_0, Topic _1, and so on.

2. To change the default name, double-click on it and enter the new name.

Edit the update interval

Double-click on the Update Interval entry and update with the new value.

Or

Right-click the Update Interval entry and select Modify Update Interval.

An update interval default to 10,000 is automatically added when a device group is created. For trigger-based polling, set the Update Interval to zero.

Note: The WEBSVC Communication Driver communicates with the target web service in two ways - Automatic and Trigger-based polling.For details about supported polling types, see Trigger a Web Request.

Rename a device group

3. Right-click on the device group to be renamed, and select Rename.

4. Enter the new device item name.

5. To apply the change, press Enter or select anywhere in the configuration view.

Delete a device group

• Right-click on the device group to be deleted and select Delete.

The device group and its corresponding update interval are deleted from the configuration view.

Note: When you select another part of the WEBSVC Communication Driver tree hierarchy, you are prompted to save the modifications to the configuration set.