// This example shows how change the percent deadband of an existing subscription. // // 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 System.Threading; using OpcLabs.BaseLib.ComInterop; using OpcLabs.EasyOpc.DataAccess.OperationModel; using OpcLabs.EasyOpc.DataAccess; namespace DocExamples.DataAccess._EasyDAClient { partial class ChangeItemSubscription { public static void PercentDeadband() { // Instantiate the client object. using (var client = new EasyDAClient()) { client.ItemChanged += client_ItemChanged_PercentDeadband; Console.WriteLine("Subscribing with 10% deadband..."); int handle = client.SubscribeItem("", "OPCLabs.KitServer.2", "Simulation.Ramp 0:100 (10 s)", VarTypes.Empty, requestedUpdateRate:100, percentDeadband:10.0f, state:null); Console.WriteLine("Waiting for 10 seconds..."); Thread.Sleep(10 * 1000); Console.WriteLine("Changing subscription to 0% deadband..."); client.ChangeItemSubscription(handle, new DAGroupParameters(100, 0.0f)); Console.WriteLine("Waiting for 10 seconds..."); Thread.Sleep(10 * 1000); Console.WriteLine("Unsubscribing..."); client.UnsubscribeAllItems(); Console.WriteLine("Waiting for 10 seconds..."); Thread.Sleep(10 * 1000); } } // Item changed event handler static void client_ItemChanged_PercentDeadband(object sender, EasyDAItemChangedEventArgs e) { if (e.Succeeded) Console.WriteLine(e.Vtq); else Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief); } } }
' This example shows how change the percent deadband of an existing subscription. ' ' 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.Threading Imports OpcLabs.BaseLib.ComInterop Imports OpcLabs.EasyOpc.DataAccess Namespace DataAccess._EasyDAClient Partial Friend Class ChangeItemSubscription Public Shared Sub PercentDeadband() Using client = New EasyDAClient() AddHandler client.ItemChanged, AddressOf client_ItemChanged_PercentDeadband Console.WriteLine("Subscribing with 10% deadband...") Dim handle As Integer = client.SubscribeItem("", "OPCLabs.KitServer.2", "Simulation.Ramp 0:100 (10 s)", VarTypes.Empty, 100, 10.0F, Nothing) Console.WriteLine("Waiting for 10 seconds...") Thread.Sleep(10 * 1000) Console.WriteLine("Changing subscription to 0% deadband...") client.ChangeItemSubscription(handle, New DAGroupParameters(100, 0.0F)) Console.WriteLine("Waiting for 10 seconds...") Thread.Sleep(10 * 1000) Console.WriteLine("Unsubscribing...") client.UnsubscribeAllItems() Console.WriteLine("Waiting for 10 seconds...") Thread.Sleep(10 * 1000) End Using End Sub ' Item changed event handler Private Shared Sub client_ItemChanged_PercentDeadband(ByVal sender As Object, ByVal e As EasyDAItemChangedEventArgs) If e.Succeeded Then Console.WriteLine(e.Vtq) Else Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief) End If End Sub End Class End Namespace
# This example shows how change the percent deadband of an existing subscription. # # 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 time # Import .NET namespaces. from OpcLabs.BaseLib.ComInterop import * from OpcLabs.EasyOpc.DataAccess import * # Item changed event handler def itemChanged(sender, e): if e.Succeeded: print(e.Vtq) else: print('*** Failure: ', e.ErrorMessageBrief, sep='') # Instantiate the client object. client = EasyDAClient() client.ItemChanged += itemChanged print('Subscribing item with 10% deadband...') handle = IEasyDAClientExtension.SubscribeItem(client, '', 'OPCLabs.KitServer.2', 'Simulation.Ramp 0:100 (10 s)', VarType(VarTypes.Empty), requestedUpdateRate=50, percentDeadband=10.0, state=None) print('Processing item change notifications for 10 seconds...') time.sleep(10) print('Changing item subscription to 0% deadband...') IEasyDAClientExtension.ChangeItemSubscription(client, handle, DAGroupParameters(50, 0.0)) print('Processing item change notifications for 10 seconds...') time.sleep(10) print('Unsubscribing item...') IEasyDAClientExtension.UnsubscribeItem(client, handle) print('Waiting for 10 seconds...') time.sleep(10) client.ItemChanged -= itemChanged print('Finished.')
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