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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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Write Boolean to OPC UA server - "not of the same type" error

Will demonstrate it simply. I'm just executing the following line: client.writeValue(nodeId, client.readValue(nodeId)); This reads the value from the server and directly writes it back - No effect. However this works as intended for "Doubles" and…
DragonGamer
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How can I test if a Milo client connection to a server is actually using encryption?

When using Eclipse Milo as a client, I want to test, after the connection has been established, if the connection is actually using encryption. What is the best approach to do so?
ctron
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OPC UA Java - How to get MonitoredItemID from a subscription publishResponse

I'm currently working with the OPC UA Foundation Java Stack, without any additional SDK's. I managed to implement subscriptions with multiple monitored items and I'm getting the change notifications correctly via the publish response. The Problem is…
Lola Parola
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OPC UA ServiceResultException(BadSecureChannelClosed) updating endpoint from server

My C# application uses the OPC UA Core stack as a Client to connect with a PLC running as a Server. I am not using the OPC UA SDK because the application is WPF and the SDK is incomprehensible. I've consulted various references (including the OPC…
Evil Dog Pie
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Creating a Table in Node OPCUA

How to extend the address space into your SQL database with bidirectional mirroring, which immediately reflects any value change in the variable or database end in the opposite end. So if I have a table in Database, whose values can be changed from…
Umer
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How to get Data Change Notification OPC UA Java Client

I am using OPC UA java stack and developing an OPC UA client. I have made subscriptions and publish request to a monitored Item. I am using datachangefilter to set trigger if the value of the monitored item changes. Now I am able to get…
Lijo Louis
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How to structure a data content in OPC UA and what exactly means delivering a OPC Specification for a application

This question is regarding OPC UA specification design for a industrial application. I am a beginner to OPC UA terminology and wondering what is the process of designing a OPC UA specification. I searched online for tutorials, tools and went through…
vijay krishna
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OPC UA server historical access support

We are looking for a solution for collecting data from different SCADA systems. It seems that OPC UA is a good approach for that. Data collection will be done from a single system to multiple SCADA systems over the internet (https). So, we are…
user1632306
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Labview: Client can not connect to OPC UA server

I am trying to connect OPC UA client to an OPC UA server over the ethernet cable. I receive the following error LabVIEW: (Hex 0xFFFA8EF7) The OPC UA client cannot connect to the OPC UA server because the security policy, username, or password is…
مسعود
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Labview OPC UA component in LabView

I have never used LabView and I have to implement communication between OP UA server and OPC UA client. Please some one tell me how to add OPC server icon in labview it is not presnt in data communication. I just can not figure out where that OPC…
مسعود
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OPC UA and data representation

Hi I am investigating OPC UA for my organization. I am trying to work out an example for a presentation based on an information or data example. I have one for a on demand read operation and one for a continuous monitor. What I don't quite…
Dixon Steel
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How can I get the list of OPC UA servers on .Net C#?

I'm writing a OPC proxy program in C#. I want to get the list of all OPC-Server on localhost or remote of the machine. I'm using OPC UA .NET from OPC foundation V1.26 I inspired me from the "sampleDiscovery-Programm" of Softing and I have now my…
Brigitte
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how to start an opc ua client for embedded STM32 board

Recently, I need some idea about how to start an OPC UA client programm on an embedded STM32, I do how to use the ansi C stack provided by OPC foundation
user3431136
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Write a value with OPC UA Java (OPC Foundation)

I am trying to connect to a remote environment using the OPC UA java stack from the OPC Foundation. Reading values is working correct, for that I am using the following code: NodeId nodeId= NodeId.get(IdType.String, 2,…
user3083205
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Cross platform OPC UA communication for mobile platforms

I was looking into options of OPC UA client for ios and Android. I found out that there are some solutions available natively in android and iOS for Android : http://www.prosysopc.com/blog/2012/02/24/otso/15/#! for iOS :…
Rahul Raj
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