How to extract or read data from OPC-UA server

[uniashish9970]

I am student and i am new to OPC-UA. I am working on project where i am using Codesys software as OPC-UA server and I am done with coding for discovery and subscription by coding simple client application in .NET SDK. I want to read the variables from the server.
How i can able to read the variable in OPC-UA client based on .NET SDK, if i am not using ua-modeler for address space design and i have server as software PLC (Codesys)?

[martenbyebye]

Hi,

I guess you solved it? Reading a node has nothing to do with the modeler. If you can browse the information model with any client, e.g. with UaExpert, you should be able to find out the NodeId and do a normal Read using the .NET SDK.

Code: Select all

var nodesToRead = new List<ReadValueId>();
nodesToRead.Add(new ReadValueId { NodeId = nodeId, AttributeId = Attributes.Value });
var dataValues = this.session.Read(nodesToRead, 0,TimestampsToReturn.Both, new RequestSettings());

[ucsballen]

uniashish,

What if you don't have the node ID. How do you browse the address space and obtain the node ID?

[ucsballen]

Never mind I figured out the answer.