Easy OPC

Eeasy OPC is a .NET wrapper over the OPC Foundation UA .NET library and can be used for OPC Server tags/singals retrieval,monitoring and updating in real time.

Prerequisite

• A 2048 bits key size valid certificate, for the "CurrentUser" store.
• Opc.Ua.Client.dll from the OPC Foundation UA .NET Library
• Opc.Ua.Core.dll from the OPC Foundation UA .NET Library

How to use it

• Create an instance of MonitoringManager class:

IMonitoringManager manager =  new MonitoringManager();

• Initialize the instance with data about he monitored OPC server:

IResult result = manager.Init(ipAddress,iPort,OPCServerInstanceName,CertificateName);

or you can use the Settings class :

ISettings settings =  new Settings(ipAddress,iPort,OPCServerInstanceName,CertificateName);

manager.Init(settings);

• Retrieve the tags from the OPC Server:

List<Tag> tags = manager.AvailableTags;	

• Subscribe to tags changes :

manager.SuSubscribeToChangeEvents((changedTag)=>{
	Console.WriteLine(String.Format("Tag {0} has a new value of {1} ",changedTag.DisplayName,changedTag.Value.ToString()));
});

• Start the OPC server monitoring process.

IResult result = manager.StartMonitoring();

if(!result.Success)
{ 
 	throw result.Exception;
}

The above code monitors all the available tags for changes.

To monitor just for a certain tag or tags changes you can use the StartMonitoring() method overload:

List<Tag> selectedTags = manager.AvailableTags.Where(tag=> ... some condition here ..);
manager.StartMonitoring(selectedTags);

• To retrieve the monitored tags (the tags passed to the StartMonitoring() method) can be used the MonitoredTags property :

var monitoredTags = manager.MonitoredTags;

• Force a tag refresh. The value and the quelity of the tag will be reloaded from the OPC Server and will update the given tag.

manager.RefreshTag(tagID);

• Write a tag value, for a writable tag.

manager.WriteTagValue(tagID,tagValue);

• Stop the monitoring process

manager.StopMonitoring()