I am new to this OPC-UA world and Eclipse Milo. I do not understand how the security works here, Discussing about client-example provided by eclipse-milo I see few properties of security being use...

I have a panel Siemens TP1200 Comfort that I have configure as OPC AU server. This panel has some tags (nodes) from which I would like to get the value from a C# application. I have read the exampl...

Node v16.14.2 Node-OPC-UA v2.75.0 Hi, I'm currently running into a problem when reading large ExtensionObjects from a S7-1500 with Custom DataTypes. At the first read process of those ExtensionObje...

Please explain what is the Difference Between OPC UA and OPC DA ? In which condition which one should be used, and if any example can be provided for both OPC UA and OPC DA, it would be helpful

I am trying out the SampleApplication NetCoreConsoleClient from OPC UA Foundation GitHub page OPC-UA.net Standard and I came to several problems along the way. I wanted to use this library to simpl...

I am using the node-opcua library to build an OPC UA client. I have use the basic example to connect to an OPC-UA server (prosys OPC-UA simulation server), but now I would like to make my client su...

Is there any decent alternative to OPC-UA as a solution for accessing process data of a system composed of various PLCs? Something that is platform independent and can "speak" with ...

I have an OPC server running on a milling machine and want to access the names of the tools which are currently available in the machine. I do know that the names of the variables I am looking for...

I have noticed that all OPC tag Ids are prefixed with ns=2;s=. Some examples of possible NodeId values would be: ns=2;s=AcquisitionTimeRemaining ns=2;s=Status ns=2;s=Time I am wondering what the ...

I have been reading around the internet for a good explanation of what a node is in OPC-UA. It seems there are libraries out there for it, but none actually explain nodes. What is the purpose of no...

I am novice to OPC Unified Architecture world and I'm studying it from basics. What exactly are namespaces and why it is always appended with NodeID?

A very basic question I'm sure. I have made the client and the server from the examples on http://node-opcua.github.io/. The example demonstrates reading the variables but not how to write. Thank...

I am entirely new to the OPC-UA world. I need to establish a proof of concept of how to allow our ERP to communicate with PLCs. I am evaluating software that acts as an OPC-UA server (it is workin...

I am using Java OPC-UA client Eclipse Milo. Whenever I create a session using endpoint URL of server, method UaTcpStackClient.getEndpoints() changes URL to localhost. String endpointUrl = "opc.tcp...

I am writing an OPC UA client using Eclipse Milo and stumbled over the following question: how does the client handle the loss of connections. For monitoring values I do this using a subscription ...

I would like to compare OPC UA vs MQTT on basis of the general characteristics of both the protocols such as Overhead (Packets), Security, Information modeling and Reliability. Where can I find som...

I am learning node opc-ua and have followed the example provided in the GitHub page for the sample_server.js and simple_client.js. In the sample_server I add a variable when constructing the addre...

I am using the OPC UA Foundation SDK to develop a small client. What would be the minimal C# code to: Connect to a server Browse the root node Print the immediate children's BrowseNames Quit? I...

In my company we have many distributed sites and each one uses a singular Scada system vendor (one uses Wincc, other place uses another...) and this systems works with almost the same kind of infor...