OPC Studio User's Guide and Reference
Examples - OPC Unified Architecture - Read a single attribute of a single node
// This example shows how to read and display data of an attribute (value, timestamps, and status code). // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-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.OperationModel; namespace UADocExamples._EasyUAClient { partial class Read { 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(); // Obtain attribute data. By default, the Value attribute of a node will be read. UAAttributeData attributeData; try { attributeData = client.Read(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853"); } catch (UAException uaException) { Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}"); return; } // Display results Console.WriteLine($"Value: {attributeData.Value}"); Console.WriteLine($"ServerTimestamp: {attributeData.ServerTimestamp}"); Console.WriteLine($"SourceTimestamp: {attributeData.SourceTimestamp}"); Console.WriteLine($"StatusCode: {attributeData.StatusCode}"); // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good } } }
# This example shows how to read and display data of an attribute (value, timestamps, and status code). # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . # OPC client and subscriber examples in PowerShell on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PowerShell . # Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own # a commercial license in order to use Online Forums, and we reply to every post. #requires -Version 5.1 using namespace OpcLabs.EasyOpc.UA using namespace OpcLabs.EasyOpc.UA.OperationModel # The path below assumes that the current directory is [ProductDir]/Examples-NET/PowerShell/Windows . Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUA.dll" Add-Type -Path "../../../Components/Opclabs.QuickOpc/net472/OpcLabs.EasyOpcUAComponents.dll" [UAEndpointDescriptor]$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 # Obtain attribute data. By default, the Value attribute of a node will be read. try { $attributeData = $client.Read($endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853") } catch [UAException] { Write-Host "*** Failure: $($PSItem.Exception.GetBaseException().Message)" return } # Display results Write-Host "Value: $($attributeData.Value)" Write-Host "ServerTimestamp: $($attributeData.ServerTimestamp)" Write-Host "SourceTimestamp: $($attributeData.SourceTimestamp)" Write-Host "StatusCode: $($attributeData.StatusCode)" # Example output: # #Value: -2.230064E-31 #ServerTimestamp: 11/6/2011 1:34:30 PM #SourceTimestamp: 11/6/2011 1:34:30 PM #StatusCode: Good
' This example shows how to read and display data of an attribute (value, timestamps, and status code). ' ' 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 OpcLabs.EasyOpc.UA Imports OpcLabs.EasyOpc.UA.OperationModel Namespace _EasyUAClient Friend Class Read 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() ' Obtain attribute data. By default, the Value attribute of a node will be read. Dim attributeData As UAAttributeData Try attributeData = client.Read(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10853") Catch uaException As UAException Console.WriteLine("*** Failure: {0}", uaException.GetBaseException.Message) Exit Sub End Try ' Display results Console.WriteLine("Value: {0}", attributeData.Value) Console.WriteLine("ServerTimestamp: {0}", attributeData.ServerTimestamp) Console.WriteLine("SourceTimestamp: {0}", attributeData.SourceTimestamp) Console.WriteLine("StatusCode: {0}", attributeData.StatusCode) ' Example output: ' 'Value: -2.230064E-31 'ServerTimestamp: 11/6/2011 1:34:30 PM 'SourceTimestamp: 11/6/2011 1:34:30 PM 'StatusCode: Good End Sub End Class End Namespace
// This example shows how to read and display data of an attribute (value, timestamps, and status code). // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // 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. #include "stdafx.h" // Includes "QuickOpc.h", and other commonly used files #include "Read.h" namespace _EasyUAClient { void Read::Main() { // Initialize the COM library CoInitializeEx(NULL, COINIT_MULTITHREADED); { // Instantiate the client object _EasyUAClientPtr ClientPtr(__uuidof(EasyUAClient)); // Obtain attribute data. By default, the Value attribute of a node will be read. _UAAttributeDataPtr AttributeDataPtr = ClientPtr->Read( //L"http://opcua.demo-this.com:51211/UA/SampleServer", L"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", L"nsu=http://test.org/UA/Data/ ;i=10853"); // Display results _variant_t vString; vString.ChangeType(VT_BSTR, &AttributeDataPtr->Value); _tprintf(_T("Value: %s\n"), (LPCTSTR)CW2CT((_bstr_t)vString)); vString.ChangeType(VT_BSTR, &_variant_t(AttributeDataPtr->ServerTimestamp, VT_DATE)); _tprintf(_T("ServerTimestamp: %s\n"), (LPCTSTR)CW2CT((_bstr_t)vString)); vString.ChangeType(VT_BSTR, &_variant_t(AttributeDataPtr->SourceTimestamp, VT_DATE)); _tprintf(_T("SourceTimestamp: %s\n"), (LPCTSTR)CW2CT((_bstr_t)vString)); _tprintf(_T("StatusCode: %s\n"), (LPCTSTR)CW2CT(AttributeDataPtr->StatusCode->ToString)); // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good } // Release all interface pointers BEFORE calling CoUninitialize() CoUninitialize(); } }
// This example shows how to read and display data of an attribute (value, // timestamps, and status code). // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // 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. class procedure Read.Main; var Client: EasyUAClient; AttributeData: _UAAttributeData; begin // Instantiate the client object Client := CoEasyUAClient.Create; // Obtain attribute data. By default, the Value attribute of a node will be // read. AttributeData := Client.Read_( //'http://opcua.demo-this.com:51211/UA/SampleServer', 'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853'); // Display results WriteLn('Value: ', AttributeData.Value); WriteLn('ServerTimestamp: ', DateTimeToStr(AttributeData.ServerTimestamp)); WriteLn('SourceTimestamp: ', DateTimeToStr(AttributeData.SourceTimestamp)); WriteLn('StatusCode: ', AttributeData.StatusCode.ToString); // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good end;
// This example shows how to read and display data of an attribute (value, // timestamps, and status code). // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client and subscriber examples in Object Pascal (Delphi) on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-OP . // 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. class procedure Read.Main; var Client: OpcLabs_EasyOpcUA_TLB._EasyUAClient; AttributeData: _UAAttributeData; begin // Instantiate the client object Client := CoEasyUAClient.Create; // Obtain attribute data. By default, the Value attribute of a node will be // read. try AttributeData := Client.Read( //'http://opcua.demo-this.com:51211/UA/SampleServer', //'https://opcua.demo-this.com:51212/UA/SampleServer/', 'opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853'); except on E: EOleException do begin WriteLn(Format('*** Failure: %s', [E.GetBaseException.Message])); Exit; end; end; // Display results WriteLn('Value: ', AttributeData.Value); WriteLn('ServerTimestamp: ', DateTimeToStr(AttributeData.ServerTimestamp)); WriteLn('SourceTimestamp: ', DateTimeToStr(AttributeData.SourceTimestamp)); WriteLn('StatusCode: ', AttributeData.StatusCode.ToString); // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good end;
// This example shows how to read and display data of an attribute (value, timestamps, and status code). // // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . // OPC client and subscriber examples in PHP on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-PHP . // 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. // Instantiate the client object $Client = new COM("OpcLabs.EasyOpc.UA.EasyUAClient"); // Obtain attribute data. By default, the Value attribute of a node will be read. try { $AttributeData = $Client->Read( //"http://opcua.demo-this.com:51211/UA/SampleServer", "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853"); } catch (com_exception $e) { printf("*** Failure: %s\n", $e->getMessage()); Exit(); } // Display results printf("Value: %s\n", $AttributeData->Value); printf("ServerTimestamp: %s\n", $AttributeData->ServerTimestamp); printf("SourceTimestamp: %s\n", $AttributeData->SourceTimestamp); printf("StatusCode: %s\n", $AttributeData->StatusCode); // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good
// This example shows how to read and display data of an attribute (value, timestamps, and status code). mle_outputtext.Text = "" // Instantiate the client object OLEObject client client = CREATE OLEObject client.ConnectToNewObject("OpcLabs.EasyOpc.UA.EasyUAClient") // Obtain attribute data. By default, the Value attribute of a node will be read. OLEObject attributeData TRY attributeData = client.Read("http://opcua.demo-this.com:51211/UA/SampleServer", "nsu=http://test.org/UA/Data/ ;i=10853") // or "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer" CATCH (OLERuntimeError oleRuntimeError) mle_outputtext.Text = mle_outputtext.Text + "*** Failure: " + oleRuntimeError.Description + "~r~n" RETURN END TRY // Display results mle_outputtext.Text = mle_outputtext.Text + "Value: " + String(attributeData.value) + "~r~n" mle_outputtext.Text = mle_outputtext.Text + "ServerTimestamp: " + String(attributeData.ServerTimestamp) + "~r~n" mle_outputtext.Text = mle_outputtext.Text + "SourceTimestamp: " + String(attributeData.SourceTimestamp) + "~r~n" mle_outputtext.Text = mle_outputtext.Text + "StatusCode: " + String(attributeData.StatusCode) + "~r~n" // Example output: // //Value: -2.230064E-31 //ServerTimestamp: 11/6/2011 1:34:30 PM //SourceTimestamp: 11/6/2011 1:34:30 PM //StatusCode: Good
# This example shows how to read and display data of an attribute (value, timestamps, and status code). # # The Python for Windows (pywin32) extensions package is needed. Install it using "pip install pypiwin32". # CAUTION: We now recommend using Python.NET package instead. Full set of examples with Python.NET is available! # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . import win32com.client from pywintypes import com_error # Instantiate the client object client = win32com.client.Dispatch('OpcLabs.EasyOpc.UA.EasyUAClient') # Obtain attribute data. By default, the Value attribute of a node will be read. try: attributeData = client.Read('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer', 'nsu=http://test.org/UA/Data/ ;i=10853') except com_error as e: print('*** Failure: ' + e.args[2][1] + ': ' + e.args[2][2]) exit() # Display results print('Value: ', attributeData.Value) print('ServerTimestamp: ', attributeData.ServerTimestamp) print('SourceTimestamp: ', attributeData.SourceTimestamp) print('StatusCode: ', attributeData.StatusCode) # Example output: # #Value: -2.230064E-31 #ServerTimestamp: 11/6/2011 1:34:30 PM #SourceTimestamp: 11/6/2011 1:34:30 PM #StatusCode: Good
REM This example shows how to read and display data of an attribute (value, timestamps, and status code). REM REM Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . REM OPC client and subscriber examples in Visual Basic on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VB . REM Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own REM a commercial license in order to use Online Forums, and we reply to every post. Public Sub Read_Main_Command_Click() OutputText = "" ' Instantiate the client object Dim Client As New EasyUAClient ' Obtain attribute data. By default, the Value attribute of a node will be read. On Error Resume Next Dim AttributeData As UAAttributeData Set AttributeData = Client.Read("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", _ "nsu=http://test.org/UA/Data/ ;i=10853") If Err.Number <> 0 Then OutputText = OutputText & "*** Failure: " & Err.Source & ": " & Err.Description & vbCrLf Exit Sub End If On Error GoTo 0 ' Display results OutputText = OutputText & "Value: " & AttributeData.value & vbCrLf OutputText = OutputText & "ServerTimestamp: " & AttributeData.ServerTimestamp & vbCrLf OutputText = OutputText & "SourceTimestamp: " & AttributeData.SourceTimestamp & vbCrLf OutputText = OutputText & "StatusCode: " & AttributeData.StatusCode & vbCrLf ' Example output: ' 'Value: -2.230064E-31 'ServerTimestamp: 11/6/2011 1:34:30 PM 'SourceTimestamp: 11/6/2011 1:34:30 PM 'StatusCode: Good End Sub
Rem This example shows how to read and display data of an attribute (value, timestamps, and status code). Rem Rem Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . Rem OPC client and subscriber examples in VBScript on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-VBScript . Rem Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own Rem a commercial license in order to use Online Forums, and we reply to every post. Option Explicit ' Instantiate the client object Dim Client: Set Client = CreateObject("OpcLabs.EasyOpc.UA.EasyUAClient") ' Obtain attribute data. By default, the Value attribute of a node will be read. On Error Resume Next Dim AttributeData: Set AttributeData = Client.Read("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer", _ "nsu=http://test.org/UA/Data/ ;i=10853") If Err.Number <> 0 Then WScript.Echo "*** Failure: " & Err.Source & ": " & Err.Description WScript.Quit End If On Error Goto 0 ' Display results WScript.Echo "Value: " & AttributeData.Value WScript.Echo "ServerTimestamp: " & AttributeData.ServerTimestamp WScript.Echo "SourceTimestamp: " & AttributeData.SourceTimestamp WScript.Echo "StatusCode: " & AttributeData.StatusCode ' Example output: ' 'Value: -2.230064E-31 'ServerTimestamp: 11/6/2011 1:34:30 PM 'SourceTimestamp: 11/6/2011 1:34:30 PM 'StatusCode: Good
# This example shows how to read and display data of an attribute (value, timestamps, and status code). # # Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html . # OPC client and subscriber examples in Python on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-Python . # 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. # The QuickOPC package is needed. Install it using "pip install opclabs_quickopc". import opclabs_quickopc # Import .NET namespaces. from OpcLabs.EasyOpc.UA import * from OpcLabs.EasyOpc.UA.OperationModel import * # Instantiate the client object. client = EasyUAClient() # Obtain attribute data. By default, the Value attribute of a node will be read. try: attributeData = IEasyUAClientExtension.Read(client, UAEndpointDescriptor('opc.tcp://opcua.demo-this.com:51210/UA/SampleServer'), UANodeDescriptor('nsu=http://test.org/UA/Data/ ;i=10853')) except UAException as uaException: print('*** Failure: ' + uaException.GetBaseException().Message) exit() # Display results. print('Value: ', attributeData.Value) print('ServerTimestamp: ', attributeData.ServerTimestamp) print('SourceTimestamp: ', attributeData.SourceTimestamp) print('StatusCode: ', attributeData.StatusCode) # Example output: # #Value: -2.230064E-31 #ServerTimestamp: 11/6/2011 1:34:30 PM #SourceTimestamp: 11/6/2011 1:34:30 PM #StatusCode: Good
:: This example shows how to read and display data of an attribute (value, timestamps, and status code). :: Invoke the OPC UA client. uaClient :: Obtain attribute data and display results. By default, the Value attribute of a node will be read. read opc.tcp://opcua.demo-this.com:51210/UA/SampleServer "nsu=http://test.org/UA/Data/ ;i=10853"
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