A.4.6 Subscriptions

The COM UA Proxy creates a Subscription in the OPC UA Server when a Group is created. The Name, Active flag, UpdateRate parameters of the Group are used while creating the subscription.

The COM UA Proxy Creates Monitored Items in the OPC UA Server when items are added to the Group.

Following parameters and filters are used for creating the monitored items:

• The ItemIds are converted to valid NodeIds by replacing the ‘-’ with ‘=’.

• Data Change Filter is used for Items with EU type as Analog:

• Trigger = STATUS_VALUE

• If DeadBand value is specified for the Group, the;

• DeadbandType = Percent

• DeadbandValue = deadband specified for the group.

The COM UA Proxy calls the Publish Service of the OPC UA Server periodically and sends any data changes to the client.