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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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862 questions
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File access in C for implemenation of a protocol OPC UA

In OPC UA embedded stack, some libraries exist already, the task is to implement the callback functions to facilitate the server with data access capability.. For historical access, for instance, the historical data for a specific node (node_handle)…
user1798597
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Maintaining a connection variable thorughout the Android Application

I have three questions:- 1) I am creating an OPCUA client for an OPCUA server. My Application has several avtivities, and most of them need the connected client. What is the best way to make my connected client available in all my actvities. I have…
Ricky
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Building a simple server using open62541 in Windows

I am trying to build a server using open62541 by referring to the documentation provided at this page. I am able to generate the open62541.c and open62541.h files by referring to this webpage. I generated these files using CMake and VisualStudio as…
Gopala Krishna
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How connect an OPC UA server to a PLC?

I have a PLC Siemens s7-1500 that did not include the license for the OPC-UA server, in consequence I'm trying to look for alternatives because I need to link this PLC information to an OPC-UA server than will be then consulted by another OPC-UA…
alejovelez41
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Build error when installing qtopcua in qt

I followed this tutorial https://blog.basyskom.com/building-qt-opc-ua-with-open62541/ and at this step "mingw32-make install" I get the follwing errors: sed -e s,D:/Qt/5.14.2/mingw73_64/qtopcua/build/lib,D:/Qt/5.14.2/mingw73_64/lib,g…
deep_sunken_sleep
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I can't connect into the OPC Server

for me is the first time to work with OPC UA. I red a lot of pace, I'd download the library OPCDAAuto.dll, I registrered it, I copied some codo to test it, but I go against mistakes. And I tried other way, but I get the same result. My code, with…
Riccardo
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OPC UA communication with different PLCs

I have a question. Does OPC UA solve the problem of communicating with for example with all type of PLCs ? The problem is for us , PLCs are different, and we want to grab data from all ! Can OPC UA do anything in here to simplify the process ?
Mojtaba Asadollahzadeh
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OPCUA-client wont open

Iam trying to open the opcua client on ubuntu 14.04.6 and i get this error: cryptography is not installed, use of crypto disabled cryptography is not installed, use of crypto disabled cryptography is not installed, use of crypto…
Mathias Jokumsen
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Connection to OPC UA Server worked via Cisco but not via Sinema RC Client

I am trying to connect to an OPC Server. I use the Softing OPC Toolkit and have managed to successfully connect via Cisco Anyconnect but do not manage to do so via Sinema RC Client V2.0. I have established a VPN connection with the Server, have…
NewEyes
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how S7-1500 OPC UA server communicates with custom client

I'm little bit confused regarding how S7-1500 embeded OPC UA server communication works in case of a custom client installed on PC since all examples I've seen so far include a Simatic PC Station as OPC server!!! On PLC side, I have S7-1511-1PN with…
Manser Dimor
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How to modelize some OPC UA classes from .Net code

We have a lot of classes that we would like to expose through OPC UA. We are trying to use the OPC UA Foundation classes. I've seen that there is a lot of example using a XML config file to create the model. Then they are using some…
J4N
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ModelCompilerSolution Microsoft Visual Studio Startup Error Message

When I try to run the solution 'ModelCompilerSolution' that is output by the OPC UA ModelCompiler BuildDesign.bat file, I get an error message from Visual Studio that says: "A project with an Output Type of Class Library cannot be started directly.…
nabs825
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Milo Project Maven Run Error

I was trying to build the milo master project in eclipse. I did a maven build as suggested by various people online. But every time a do the maven build I am getting a build error stating it requires a goal. Can anyone let me know whats wrong with…
Yash Mehta
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Creating monitored items using ua-java

I'm currently working with the OPC UA Foundation Java Stack, without any additional SDK's. I am unable to implement subscriptions with monitored items and to get the change notifications via the publish response. I am new to Java, any help regarding…
karthik v
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How to connect two Raspberry Pi with OPC UA?

I have two Raspberry Pi and i want to connect these two via OPC UA making one of them as Server and other as Client. Do you have any Idea or clues or you knows any Websites which helps me to understand the basic ? Or simply how can i connect…
Avinash Vaghasiya
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