UAException Class

Exceptions arising from OPC-UA (Unified Architecture) operations.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<CLSCompliantAttribute(True)>
<ComDefaultInterfaceAttribute(OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException)>
<ComVisibleAttribute(True)>
<GuidAttribute("7932FA12-C5A3-4DE6-826F-A9F57C99555E")>
<TypeConverterAttribute(System.ComponentModel.ExpandableObjectConverter)>
<SerializableAttribute()>
Public Class UAException 
   Inherits OpcLabs.BaseLib.OperationModel.OperationException
   Implements OpcLabs.BaseLib.ComTypes._Exception2, OpcLabs.BaseLib.OperationModel.ComTypes._OperationException, OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException, System.Runtime.InteropServices._Exception, System.Runtime.Serialization.ISerializable

'Usage
 
Dim instance As UAException

[CLSCompliant(true)]
[ComDefaultInterface(OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException)]
[ComVisible(true)]
[Guid("7932FA12-C5A3-4DE6-826F-A9F57C99555E")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[Serializable()]
public class UAException : OpcLabs.BaseLib.OperationModel.OperationException, OpcLabs.BaseLib.ComTypes._Exception2, OpcLabs.BaseLib.OperationModel.ComTypes._OperationException, OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException, System.Runtime.InteropServices._Exception, System.Runtime.Serialization.ISerializable

[CLSCompliant(true)]
[ComDefaultInterface(OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException)]
[ComVisible(true)]
[Guid("7932FA12-C5A3-4DE6-826F-A9F57C99555E")]
[TypeConverter(System.ComponentModel.ExpandableObjectConverter)]
[Serializable()]
public ref class UAException : public OpcLabs.BaseLib.OperationModel.OperationException, OpcLabs.BaseLib.ComTypes._Exception2, OpcLabs.BaseLib.OperationModel.ComTypes._OperationException, OpcLabs.EasyOpc.UA.OperationModel.ComTypes._UAException, System.Runtime.InteropServices._Exception, System.Runtime.Serialization.ISerializable

Remarks

In general, you cannot safely prevent these exceptions from happening. Various conditions external to your code can cause OPC failures, e.g. network problems, improper OPC server configuration, etc. For this reason, you should always expect that an OPC operation can fail.

Instances of this class typically contain an inner exception that provides more specific details about the error that occurred. It is recommended to examine the inner exception, if available, to obtain more detailed information about the cause of the failure.

Example

CSharp
PowerShell
VB.NET
Python

// This example shows how to write data (a value, timestamps and status code) into a single attribute of a node.
//
// Find all latest examples here: https://www.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
// OPC client 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://forum.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.OperationModel;

namespace UADocExamples._EasyUAClient
{
    class Write
    {
        public static void Main1()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object.
            var client = new EasyUAClient();

            Console.WriteLine("Modifying data of a node's attribute...");
            try
            {
                client.Write(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10221",
                    new UAAttributeData(12345, UASeverity.GoodOrSuccess, DateTime.UtcNow));

                // The target server may not support this, and in such case a failure will occur.
            }
            catch (UAException uaException)
            {
                Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}");
                return;
            }

            Console.WriteLine("Finished.");
        }
    }
}

# This example shows how to write data (a value, timestamps and status code) into a single attribute of a node.
#
# Find all latest examples here: https://www.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
# OPC client and subscriber examples in PowerShell on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-PowerShell .
# Missing some example? Ask us for it on our Online Forums, https://forum.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.OperationModel

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

[UAEndpointDescriptor]$endpointDescriptor =
    "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
# or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
# or "https://opcua.demo-this.com:51212/UA/SampleServer/"

# Instantiate the client object.
$client = New-Object EasyUAClient

Write-Host "Modifying data of a node's attribute..."
try {
    $client.Write($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10221", 
        (New-Object UAAttributeData(12345, [UASeverity]::GoodOrSuccess, [DateTime]::UtcNow)))

    # The target server may not support this, and in such case a failure will occur.
}
catch [UAException] {
    Write-Host "*** Failure: $($PSItem.Exception.GetBaseException().Message)"
    return
}

Write-Host "Finished."

' This example shows how to write data (a value, timestamps and status code) into a single attribute of a node.
'
' Find all latest examples here: https://www.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://forum.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 OpcLabs.EasyOpc.UA
Imports OpcLabs.EasyOpc.UA.OperationModel

Namespace Global.UADocExamples._EasyUAClient
    Friend Class Write
        Public Shared Sub Main1()

            ' Define which server we will work with.
            Dim endpointDescriptor As UAEndpointDescriptor =
                    "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"
            ' or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            ' or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            ' Instantiate the client object
            Dim client = New EasyUAClient()

            Try
                ' Modify data of a node's attribute
                client.Write(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10221",
                                   New UAAttributeData(12345, UASeverity.GoodOrSuccess, Date.UtcNow)) ' or "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer"

                ' The target server may not support this, and in such case a failure will occur.
            Catch uaException As UAException
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message)
            End Try
        End Sub
    End Class
End Namespace

# This example shows how to write data (a value, timestamps and status code) into a single attribute of a node.
#
# Find all latest examples here: https://www.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
# OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-Python .
# Missing some example? Ask us for it on our Online Forums, https://forum.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.
# The QuickOPC package is needed. Install it using "pip install opclabs_quickopc".
import opclabs_quickopc

# Import .NET namespaces.
from System import *
from OpcLabs.EasyOpc.UA import *
from OpcLabs.EasyOpc.UA.OperationModel import *


endpointDescriptor = UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer')
# or 'http://opcua.demo-this.com:51211/UA/SampleServer' (currently not supported)
# or 'https://opcua.demo-this.com:51212/UA/SampleServer/'

# Instantiate the client object
client = EasyUAClient()

print("Modifying data of a node's attribute...")
try:
    IEasyUAClientExtension.Write(client,
        endpointDescriptor,
        UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10221'),
        UAAttributeData(12345, UAStatusCode(UASeverity.GoodOrSuccess), DateTime.UtcNow))
except UAException as uaException:
    print('*** Failure: ' + uaException.GetBaseException().Message)
    exit()

print('Finished.')

Inheritance Hierarchy

System.Object
   System.Exception
      System.ApplicationException
         OpcLabs.BaseLib.Exception2
            OpcLabs.BaseLib.OperationModel.OperationException
               OpcLabs.EasyOpc.UA.OperationModel.UAException
                  OpcLabs.EasyOpc.UA.OperationModel.UALogicalException

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

UAException Members
OpcLabs.EasyOpc.UA.OperationModel Namespace

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Missing some example? Ask us for it on our Online Forums! You do not have to own a commercial license in order to use Online Forums, and we reply to every post.