OPC-UA subscription and event notification

Ignition
1

I’m connecting to a prosys OPC-UA demo server and I’m defining OPC TAG.
It is not clear from the manual if I’m realizing a subscrition to the OPC-UA node (i.e. I’m notified only when the value changes) or the node is polled.

Besides, the OPC-UA demo server is sending alarm, but I can not see them in IGNITION. How can I subscrive and receive server event in ignition?
Please note that the simple OPC-UA client in ignition is able to subscribe and receive alarm and notification.
Thanks,

2

If you’re in the designer and you drag and drop a tag from the OPC browser, that’s using a subscription (unless the scan class is in OPC Read Mode).

If you’re in the quick client on the gateway web page then clicking the [s] button next to each node will subscribe to that node for the duration of your web session.

Alarms and events are not supported in either context.

3

Thanks for your fast and clear answer.
Piero