OPC UA Subscriptions List

The OPC UA Subscriptions List is specific to the OPC UA driver - it is only available on systems on which that driver is installed. Like other Queries Lists, you can display the List from the Queries Bar. Alternatively, you can use the Display Subscriptions pick action to display a filtered list that just includes the OPC UA Subscriptions that reference a particular OPC UA Server.

The OPC UA Subscriptions List provides a summary of the status of the OPC UA Subscription database items to which your User Account and the client provide access.

As with other Lists, the OPC UA Subscriptions List consists of rows and columns. Each row represents an individual OPC UA Subscription and each column contains status information about that particular OPC UA Subscription item.

The OPC UA Subscriptions List contains these columns:

• Name—The full name of the database item, including its path in the Geo SCADA Expert database.

• State—The item's present activity status. The entry is identical to that shown by the State attribute on the item's Status display.

• Last Updated—The time and date that the item's activity status last changed. The entry is identical to that of the Last Updated attribute on the item's Status display.

• Quality—The quality of the item's data. The entry is identical to that of the Quality attribute on the item's Status display.

• Current Request—The request that the point source is currently processing (if any).

• Source Name—The name of the OPC UA Server database item that represents the source of the data for the point source.

• Source—The source of the data, comprising the location at which the item resides. The entry is identical to that of the Source attribute on the item's Status display. For more information, see Source.

• Current Server—The name of the OPC UA server that the subscription is currently using (if any). The entry is identical to that of the Current Server attribute on the item's Status display.

• Type—The type of database item. This column displays the entry 'OPC UA Subscription'.

• Memory Usage—The approximate amount of system memory that is occupied by the item, specified in bytes.

• Alarm View—This column is only populated if the item or the Group with which it is associated is configured to have an Alarm View (see Define an Alarm View). When populated, you can select the entry to display that Alarm View.

As with other Lists, you can right-click on an entry in the List to display a context-sensitive menu. From this menu, you can select options to display further information about an OPC UA Subscription, or perform various actions. For information about the actions that are specific to this type of database item, see Actions Associated with OPC UA Subscription Items.