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12:21, EET
July 22, 2014
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Hi all,
I am working without UaNodes because we have data structures already created.
I would want to know how is the best way to integrate events and alarms in this system, as in the example code this is not shown, and in the documentation very little is said.
Regards
13:24, EET
December 21, 2011
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Server Tutorial says this:
12.6 MonitoredEventItems
Events are monitored via MonitoredEventItems. In principle, the system is equal to monitoring the DataItems, but you must track the item creations with afterCreateMonitoredEventItem() (in NodeManager or EventManager). And when you are ready to trigger an event, you must call MonitoredEventItem.notifyEvent() to send it to the client. For notifyEvent you will need an EventData structure, which defines the values of all condition fields. You should refer to the OPC Foundation specification for that or take a look at the respective node implementations in the SDK.
13:27, EET
December 21, 2011
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Take a look at the respective monitored data example and MyBigNodeManager (the complete chapter 12. in Tutorial).
Unfortunately, we do not have any example implementation – and I do know that it is not trivial.
15:10, EET
July 22, 2014
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Yes, it talks about Monitoring them, but I don’t know how to create and managing them. Are they like any other DataItems?
Are there any classes in the API that I can use for them, or everything is for UaNodes? I mean, for example, the class DiscreteAlarmType and many others.
15:37, EET
December 21, 2011
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Yes, all generated Java classes are based on UaNodes. So you will need to write your application so that it provides the data for correct nodes yourself, although there are no actual nodes in the background.
The alarm nodes are typically exposed as objects in the address space, since they have a state. Simple events typically are not in the address space, so those you can just trigger
It might be possible to write a “hybrid” node manager that has alarm nodes for the meta data, but keeps the rest of the data in the back-end system. But we have not actually tried that, and it is probably not possible to make it work at the moment. You may of course try and let us know what kind of limitations you find out.
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