// This example shows how to create a data variable and implement reading its attribute data using a function, providing // "Good" or "Bad" status code as needed. // You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-OPCStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. using System; using OpcLabs.EasyOpc.UA; using OpcLabs.EasyOpc.UA.Generic; using OpcLabs.EasyOpc.UA.NodeSpace; namespace UAServerDocExamples._UADataVariable { partial class ReadFunction { public static void Unreliable() { // Instantiate the server object. // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/". var server = new EasyUAServer(); // Create a data variable, defining its read attribute data (including status code and source timestamp) by a // function. Alternate "Good" and "Bad" status codes randomly. // The type of the data variable (Int32, in this case) is inferred from the type returned by the function. var random = new Random(); server.Add(new UADataVariable("ReadThisVariable").ReadFunction(() => new UAAttributeData<int>( value: 42, (random.Next(2) != 0) ? UACodeBits.Good : UACodeBits.BadNoCommunication, DateTime.UtcNow))); // Start the server. Console.WriteLine("The server is starting..."); server.Start(); Console.WriteLine("The server is started."); Console.WriteLine(); // Let the user decide when to stop. Console.WriteLine("Press Enter to stop the server..."); Console.ReadLine(); // Stop the server. Console.WriteLine("The server is stopping..."); server.Stop(); Console.WriteLine("The server is stopped."); } } }
' This example shows how to create a data variable and implement reading its attribute data using a function, providing ' "Good" or "Bad" status code as needed. ' You can use any OPC UA client, including our Connectivity Explorer and OpcCmd utility, to connect to the server. ' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . ' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBNET . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. Imports System Imports Newtonsoft.Json.Linq Imports OpcLabs.EasyOpc.UA Imports OpcLabs.EasyOpc.UA.Generic Imports OpcLabs.EasyOpc.UA.NodeSpace Namespace _UADataVariable Partial Friend Class ReadFunction Shared Sub Unreliable() ' Instantiate the server object. ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/". Dim server = New EasyUAServer() ' Create a data variable, defining its read attribute data (including status code and source timestamp) by a ' function. Alternate "Good" and "Bad" status codes randomly. ' The type of the data variable (Int32, in this case) is inferred from the type returned by the function. Dim random = New Random() server.Add(New UADataVariable("ReadThisVariable").ReadFunction(Function() New UAAttributeData(Of Integer)( 42, If(random.Next(2) <> 0, UACodeBits.Good, UACodeBits.BadNoCommunication), DateTime.UtcNow))) ' Start the server. Console.WriteLine("The server is starting...") server.Start() Console.WriteLine("The server is started.") Console.WriteLine() ' Let the user decide when to stop. Console.WriteLine("Press Enter to stop the server...") Console.ReadLine() ' Stop the server. Console.WriteLine("The server is stopping...") server.Stop() Console.WriteLine("The server is stopped.") End Sub End Class End Namespace
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