// This example shows how to subscribe to changes of a monitored item with percent deadband.
using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;
namespace UADocExamples._EasyUAClient
{
partial class SubscribeDataChange
{
public static void PercentDeadband()
{
UAEndpointDescriptor endpointDescriptor =
"opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
// or "http://opcua.demo-this.com:51211/UA/SampleServer" (not in .NET Standard)
// or "https://opcua.demo-this.com:51212/UA/SampleServer/"
// Instantiate the client object and hook events
var client = new EasyUAClient();
client.DataChangeNotification += client_DataChangeNotification_PercentDeadband;
const double percentDeadband = 5.0;
Console.WriteLine($"Subscribing with {percentDeadband}% deadband...");
client.SubscribeDataChange(endpointDescriptor,
"nsu=http://test.org/UA/Data/ ;i=11194", // /Data.Dynamic.AnalogScalar.Int32Value
samplingInterval:1000,
new UADataChangeFilter(UADeadbandType.Percent, percentDeadband));
Console.WriteLine("Processing data change events for 20 seconds...");
System.Threading.Thread.Sleep(20 * 1000);
Console.WriteLine("Unsubscribing...");
client.UnsubscribeAllMonitoredItems();
Console.WriteLine("Waiting for 5 seconds...");
System.Threading.Thread.Sleep(5 * 1000);
}
static void client_DataChangeNotification_PercentDeadband(object sender, EasyUADataChangeNotificationEventArgs e)
{
// Display value
if (e.Succeeded)
Console.WriteLine("Value: {0}", e.AttributeData.Value);
else
Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief);
}
}
}