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Questions tagged [opc]

OPC (Open Platform Communications) is the interoperability standard for the secure and reliable exchange of data in the industrial automation space.

OPC (Open Platform Communications) is the interoperability standard for the secure and reliable exchange of data in the industrial automation space.

From: http://www.opcfoundation.org/

Useful Links

648 questions
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What is the Server ID and CLSID of Simatic NET OPC Server to program in C#?

I am using Simatic NET OPC Server.. Please help me , how to get Server ID and CLSID of Simatic NET OPC
user3331091
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Two issue about python OpenOPC library

Issues description and environments The OpenOPC library is friendly and easy to use, the api is simple too, but I have found two issues during the development of a tool to record real time OPC items data. The development environment is: Window…
Erxin
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How to know an OPC Server CLSID?

I'm trying to connect to an OPC server via openscada. I already know the OPC server program ID given by MatrikonOPC explorer but the connection doesn't work probably due to a wrong DCOM configuration. Before to go further I would like to try to…
L. G.
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OPC UA Historical Data Access - Event History

I would like to know if there is some currently available OPC UA Client supporting Historical Data Access, more precisely for Data AND Event History. UA Expert from Unified Automation seems like to be one of the most advanced OPC UA Client, but it…
Camille G.
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Noob guide to OPC: how to write a C# Hello World client?

Here is my situation: We have a software that is used to monitor solar power plants developed. I have to introduce OPC as a new way to acquire data from the physical devices themselves, so that's why I ended up trying to learn about OPC, which so…
sergio
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C# OPC Client fails to get server list

After I compiled my C# in my new Windows 8 64-Bit machine, I started to get the following error while getting list of available servers in my OPC client application. "OpcNetApi.Com Unable to cast COM object of type 'System.__ComObject' to interface…
Demir
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Unable To Cast object type 'System.String[*]' to type 'System.String[]'

Hi everyone i had a issue with a code in C# .NET, I'm using a DLL for connect to OPC Servers the DLL that was used in a VB.NET project and works with no problem at all. I'm trying to show a list of available Servers in a ListBox, the code used in…
Manuel Espino
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OPC UA Subscription in a C# Client app doesn't trigger event handlers

I have a FactoryTalk server with some nodes and I need to monitor several attribute values. I made a client which reads and writes data succesfully, but I can't get the subscription to work. Here's the subscription configuration: subscription = new…
infradude
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How to form an OPCUA connection in python from server IP address, port, security policy and credentials?

I have never used OPC-UA before, but now faced with a task where I have to pull data from a OPC-UA machine to push to a SQL database using python. I can handle the database part, but how to basically connect to the OPCUA server when I have only the…
Della
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is there any way to reduce the Tags browse time in OPC UA client?... while connected OPC UA Server

I have reduce and checked with SamplingInterval and PublishingInterval..values There is no impact. can you suggest any way? Let me know.
Kalaiyarasan B
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OPC UA client: Call Methods

I'm Trying to call a method from a OPC UA server device. this is the method: StartScan Method It contains Two Arguments: InputArguments OutputArguments I'm not able with my code: from opcua import Client, ua url =…
Leonardo Tavolari
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Create Custom complex Datatypes in OPC UA (UA-.NETStandard)

I am new to the OPC UA world. Can anybody guide my how to create a custom complex type in c# using OPCFoundation/UA-.NETStandard.In my CreateAddressSpace method I want to create a node 'ABC' with custom datatype like Person and Person will have…
Yasir
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PLC not connecting to KEP Server (OPC)

We can't get our PLC to reliably connect with KEPServerEX (OPC). I was wondering if anyone else here at SOF has experience working with PLC and OPC. If so do they have any tips on making a reliable connection with our OPC Server. We currently use…
Rob_IGS
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Should/Can you run Node-OPCUA Server running on Azure?

I deployed my OPC Server (made with Node.js node-opcua) on Azure as a WebApp and its running. I also got the opc.tcp address (eg. opc.tcp://somenumbers:4840/UA/INDUSTRIE4.0) . When I try to connect to it with UaExpert I get this error: Discovery…
Suisse
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Is the range 951 to 1999 reserved for application level node ids in OPC UA address space?

From looking at the node ids file , you'll notice that node ids skip the range 951 - 1999 i.e. there are no OPC UA nodes with nodeids within that range. Is the range reserved for application use ? Is it safe for my server implementation to use…
salimsaid
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