// This example shows how to define a data variable of OPC data type UInt16 and use an action to its write behavior.
// This is an example of the push data consumption model.
// 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.NodeSpace;
namespace UAServerDocExamples._UADataVariable
{
partial class WriteValueAction
{
public static void UInt16()
{
// Instantiate the server object.
// By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
var server = new EasyUAServer();
// Create a writable data variable and add an action that will be executed when the data variable is written to.
// We explicitly specify the OPC data type of the variable to be UInt16, but use .NET Int32 in the write value
// function. The OPC Wizard will attempt to convert the value being written to the specified .NET type. This is
// helpful in languages like VB.NET that do not have full support for some types (such as unsigned integers).
server.Add(new UADataVariable("WriteToThisVariable").WriteValueAction<int>(
typeof(UInt16),
value => Console.WriteLine($"Value written: {value}")));
// Start the server.
Console.WriteLine("The server is starting...");
server.Start();
Console.WriteLine("The server is started.");
Console.WriteLine("Any value written to the example data variable will be displayed on the console.");
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 define a data variable of OPC data type UInt16 and use an action to its write behavior.
' This is an example of the push data consumption model.
' 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 OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.NodeSpace
Namespace _UADataVariable
Partial Friend Class WriteValueAction
Shared Sub UInt16()
' Instantiate the server object.
' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
Dim server = New EasyUAServer()
' Create a writable data variable and add an action that will be executed when the data variable is written to.
' We explicitly specify the OPC data type of the variable to be UInt16, but use .NET Int32 in the write value
' function. The OPC Wizard will attempt to convert the value being written to the specified .NET type. This is
' helpful in languages like VB.NET that do not have full support for some types (such as unsigned integers).
server.Add(New UADataVariable("WriteToThisVariable").WriteValueAction(Of Integer)(
GetType(UInt16),
Sub(value) Console.WriteLine($"Value written: {value}")))
' Start the server.
Console.WriteLine("The server is starting...")
server.Start()
Console.WriteLine("The server is started.")
Console.WriteLine("Any value written to the example data variable will be displayed on the console.")
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
