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Questions tagged [opc-ua]

The Open Platform Communications (OPC) Unified Architecture (UA), released in 2008, is a platform independent service-oriented architecture that integrates all the functionality of the individual OPC Classic specifications into one extensible framework. Use this tag on questions that concern Open Platform Communications Unified Architecture, in contrast to legacy OLE-based OPC.

The Open Platform Communications (OPC) Unified Architecture (UA), released in 2008, is a platform independent service-oriented architecture that integrates all the functionality of the individual OPC Classic specifications into one extensible framework.

is an interoperability standard that enables the secure and reliable exchange of industrial automation data while remaining cross-platform and vendor neutral. The specification, currently version 1.03, is developed and maintained by the OPC Foundation with the guidance of individual software developers, industry vendors, and end-users. It defines the interface between Clients and Servers, including access to real-time data, monitoring of alarms and events, historical data access, and data modeling.

From: https://projects.eclipse.org/projects/iot.milo

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How to connect to an OPC-UA server which requires certificate based user authentication using node-opcua based client

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 support various authentication methods. I am able to…
bruceceng
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What is a node in OPC-UA?

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 nodes in OPC-UA? Note: OPC and OPC-UA noob here
Intrastellar Explorer
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How to mock a OPC UA Session for unit testing in C#

I have a C# application, which includes a service that works with multiple OPC UA Sessions (UnifiedAutomation.UaClient.Session). These sessions are created by connecting to addresses like opc.tcp://localhost:48030 etc. foreach…
jasie
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node-opcua how to write to variables

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. Thanks for the help
uprightcarrion
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node.js opc ua many monitored items

I use node-opcua module and I would like to monitor many opc ua nodes with subscription I see result like: user in html UI choose what nodes to monitor, then click Monitor button that sent these nodeIds as parameters and then for every nodeid will…
leonas5555
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How to handle a segmentation fault before a slot is called

I'm developing a Qt 6.4.0 application that runs on Ubuntu 22.04 (Jammy Jellyfish), and it uses Qt OPC UA to connect to several PLCs on the network. After running some hours, my application crashes. Long story short, I discovered it happens when a…
Mark
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How do I create the correct application certificate to work with the OPC UA server?

I am trying to create my own OPC UA client. I am using Nuget Package OPCFoundation.NetStandard.Opc.Ua. For this I used the following code example: using System; using System.Collections.Generic; using System.Windows.Forms; using Opc.Ua; //…
FaceHoof
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C# - OPC-UA server application has not been created PKI certificate in Linux machine

When I run OPC-UA server C# application in windows machine then OPC-UA server has created a certificate path C:\ProgramData\OPC Foundation\pki\own and generates some certificates inside this path, but when I installed OPC-UA server in Linux machine…
Md Shahnewaz
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How to get the value of a node with OPC UA and C#?

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 examples of the OPC UA github project:…
Álvaro García
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Connect with OPCUA server with Basic256Sha256 in Python

Te following code is used to connect with the opcua server: from opcua import Client client = Client(url='opc.tcp://192.168.0.5:4840') client.set_user('user1') client.set_password('password') client.connect() Error message: Received an error:…
JoostBerkers
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R-package for OPC UA

I would like to know if someone works on a package for R using the OPC-UA communication standard. I found no R-package on CRAN and also on GitHub. My idea is to to some real-time analysis of data send by a OPC-UA server. There are some python…
J_F
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Python - Opc ua with Security Policy

I've try to connect to an Opc Ua server with a python script. The manufacturer of the machine says to me that I have to connect with Basic256Sha256, Sign and he does not use any certificate. I use this library from opcua import Client from opcua…
CarloMatto
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Regarding mDNS observations on Wireshark

I am a beginner here, would like to clarify a few things. I have a server (OPC UA) running on my system, and the specification says it is announcing itself on the local link using DNS SRV records. On doing some research, I figured that mDNS is used…
Rakshan Premsagar Kapikad
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OPC UA-.net Standard C# simple console client

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 simply read the data sent by the server (i am using…
VidyaPuri
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Create a very simple OPC client in Unity3d with opc ua .net library

I am getting these errors while trying to implement a simple OPC client in .Net with Unity3D.These errors are in Visual Studio: Severity Code Description Project File Line Suppression State Error CS0012 The type…
Suisse
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