Examples - Server OPC UA - Retrieve the attribute data in pull data consumption model

.NET

// This example shows how to retrieve the attribute data in the pull data consumption model. In this model, the data that
// OPC clients write to the server is pulled and processed by your code when 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-ConnectivityStudio/Latest/examples.html .
// OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-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;
using Timer = System.Timers.Timer;

namespace UAServerDocExamples._UADataVariable
{
    class WriteAttributeData
    {
        public static void Main1()
        {
            // Instantiate the server object.
            // By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            var server = new EasyUAServer();

            // Create a read-write data variable with an initial value.
            var dataVariable = UADataVariable.CreateIn(server.Objects, "WriteToThisVariable").ReadWriteValue(0);

            // Create a timer for pulling the data from OPC writes. In a real server the activity may also come from other
            // sources.
            var timer = new Timer
            {
                Interval = 1000,
                AutoReset = true,
            };

            // Periodically display the value of the data variable on the console.
            timer.Elapsed += (sender, args) => Console.Write($"  {dataVariable.WriteAttributeData.Value}");
            timer.Start();
            Console.WriteLine("Values of the example data variable are displayed on the console periodically.");

            // 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();

            // Stop the timer.
            timer.Stop();

            Console.WriteLine("The server is stopped.");
        }
    }
}

# This example shows how to retrieve the attribute data in the pull data consumption model. In this model, the data that
# OPC clients write to the server is pulled and processed by your code when 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-ConnectivityStudio-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.

#requires -Version 5.1
using namespace OpcLabs.EasyOpc.UA
using namespace OpcLabs.EasyOpc.UA.NodeSpace
using namespace OpcLabs.PowerShellManagement

# The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows .
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.ServerOpcUAComponents.dll"
Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.PowerShellManagement.dll"

# Instantiate the server object.
# By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
$server = New-Object EasyUAServer

# Create a read-write data variable with an initial value.
$dataVariable = [UADataVariableExtension]::ReadWriteValue([UADataVariable]::CreateIn($server.Objects, "WriteToThisVariable"), 0)

# Create a timer for pulling the data from OPC writes. In a real server the activity may also come from other
# sources.
$timer = New-Object Timers.Timer -property @{
    Interval = 1000
    AutoReset = $true
}

# Periodically display the value of the data variable on the console.
$timer.add_Elapsed([RunspacedDelegateFactory]::NewRunspacedDelegate([System.Timers.ElapsedEventHandler] { param ($sender, $e) Write-Host "  $($dataVariable.WriteAttributeData.Value)" }))
$timer.Start()
Write-Host "Values of the example data variable are displayed on the console periodically."

# Start the server.
Write-Host "The server is starting..."
$server.Start()

Write-Host "The server is started."
Write-Host

# Let the user decide when to stop.
Write-Host "Press Enter to stop the server..."
Read-Host

# Stop the server.
Write-Host "The server is stopping..."
$server.Stop()

# Stop the timer.
$timer.Stop()

Write-Host "The server is stopped."

' This example shows how to retrieve the attribute data in the pull data consumption model. In this model, the data that
' OPC clients write to the server is pulled and processed by your code when 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-ConnectivityStudio/Latest/examples.html .
' OPC client and subscriber examples in VB.NET on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-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
Imports Timer = System.Timers.Timer

Namespace Global.UAServerDocExamples._UADataVariable
    Partial Friend Class WriteAttributeData
        Shared Sub Main1()
            ' Instantiate the server object.
            ' By default, the server will run on endpoint URL "opc.tcp://localhost:48040/".
            Dim server = New EasyUAServer()

            ' Create a read-write data variable with an initial value.
            Dim dataVariable = UADataVariable.CreateIn(server.Objects, "WriteToThisVariable").ReadWriteValue(0)

            ' Create a timer for pulling the data from OPC writes. In a real server the activity may also come from other
            ' sources.
            Dim timer = New Timer With
            {
                .Interval = 1000,
                .AutoReset = True
            }

            ' Periodically display the value of the data variable on the console.
            AddHandler timer.Elapsed, Sub(sender, args) Console.Write($"  {dataVariable.WriteAttributeData.Value}")
            timer.Start()
            Console.WriteLine("Values of the example data variable are displayed on the console periodically.")

            ' 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()

            ' Stop the timer.
            timer.Stop()

            Console.WriteLine("The server is stopped.")
        End Sub
    End Class
End Namespace

OPC Wizard

OPC Wizard Pull Data Consumption Model