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OPC-UA Alarms & Conditions

QuickOPC gives you access to OPC UA functionality described in Part 9 of the OPC Unified Architecture Specification, also known as Alarms & Conditions. This part shares many common concepts and objects with the Generic/Data part, making it easy to understand, and also easy to create applications that mix multiple functionalities in one project.

If you need OPC Alarms & Events for OPC "Classic" (COM-based), click here - QuickOPC supports it too.

What Can You Do?

With QuickOPC, you can:
  • Discover (browse) OPC servers (applications) on the computer and on the network.
  • Browse the address space of the OPC server; you can also browse for event sources and notifiers..
  • Subscribe to OPC UA events, and possibly later change the parameters of the subscription, or unsubscribe.
  • Receive event notifications, separately from data change notifications, and handle them using event handlers, or callback methods.
  • Specify event filters with your subscriptions, including the so-called Select clauses and Where clauses. It is possible to use pre-defined clauses to cover the most common cases.
  • Costruct Select clauses using a combination of filter operands and filter operators.
  • Use a builder class to create Select clauses (a form of expressions over OPC attributes) easily.
  • Refresh condition states (QuickOPC initiates the Refresh automatically, by default).
  • Enable and disable conditions, and apply comments to them.
  • Respond to alarm dialogs.
  • Acknowledge and/or confirm condition instance states.
  • Shelve and unshelve alarms. Timed shelve, or one shot shelve, are both possible.
  • Display ready-made browsing dialogs and use browsing controls with rich user interface.

OPC-UA Alarms & Conditions Example in C#

The code below (in C#) shows how to subscribe to event notifications and display each incoming event using a callback method that is provided as lambda expression, using QuickOPC:

// The callback is a lambda expression that displays the event 
EasyUAClient.SharedInstance.SubscribeEvent(
    "opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer",     UAObjectIds.Server,
1000,
    (_, args) => Console.WriteLine(args));

No other product can do this in such a clear and concise code, in a single statement!

Try It

Of course, more examples come with the product. And, all OPC UA Alarms & Conditions features of QuickOPC can be used from many languages and tools - not just C#, but also VB.NET, VB6, C/C++. VB6, PHP, Excel (VBA), Delphi, Perl, Python and more.