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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/

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648 questions
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Can PHP Connect to an OPC Server?

I'm having a difficult time finding out if PHP can connect to an OPC server, and how. Our PHP is running on Unix with an Apache webserver. The OPC server is on Windows, that's the most I know about it at this time. Both servers are on the same…
Nick
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Where is a good place to start with making an application in .NET that communicates through OPC?

Where is a good place to start with making an application in .NET that communicates through OPC?
GEOCHET
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Calling QueryInterface with custom identity

Issue: I successfully call CoSetProxyBlanket on a proxy (if that's the right term for it) and then I call QueryInterface on that same proxy, but I receive a result of 0x80070005 ("Access Denied"). However, if I first call CoInitializeSecurity (which…
bruceceng
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C# opc-client .net api

I'm writing opc client, using .NET API from opc foundation. In samples I only see, where item's names are hardcoded like: items[0] = new Opc.Da.Item(); items[0].ItemName = "blahblahblah"; What I want, is not to write names of all items by my…
eba
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EDS for CANopen and Modbus

The device I'm developing has to support both CANopen and Modbus (RTU and TCP) communications. Is there any format of Electronic Data Sheet (e.g EDS or XDD) that can be used to define both? I have tried using a couple of tools (Vector CANeds and…
Evil Dog Pie
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Why my app leaks memory ? How to avoid memory leakage?

I'm writing an OPC client so I use the Python OpenOPC library. The problem is each time I'm reading a list of OPC items, my app consume memory. For example, the following code consume about 100ko at each iteration : #!/usr/bin/python # -*- coding:…
Loïc G.
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Utgard - Access denied

I have been unable to find a solution that fixes my issue, so I am opening a new topic. Utgard (http://openscada.org/projects/utgard) seems like a very useful tool to me. In this phase I just want to be able to access the TOP OPC Server locally on…
user2656046
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OPC DA client library for Objective-C

I'm developing an iPhone application with a couple of features. Now I need to connect to an OPC DA server but I don't want to implement OPC by my self. Does an Objective-C library even exists? or are there other possible solutions for my problem…
Elias DC
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Open source library in Java for communicating with OPC HDA Server

I am trying to create an application which entails communication with an OPC HDA server to get historical values of tags. I was wondering if there are any free/open source libraries available in Java which can help me do that. I have already tried…
Paws
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c# OPC Automation gives 80040154

I am a .Net developer. New to OPC. When I tried some samples of OPC Client all of them give this error. It seems the DLL is not registered it seems. But I don't know how and where to register this. error: retrieving the COM class factory for…
Abu Sithik
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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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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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Specify Editors in Mercurial

In general, if I've got a custom file of type W and want to use custom application/editor X to open/view it how do i set up Hg to call the application X when i want to edit/view the file? Specific example: I'm using TortoiseHg to track a set of…
user595985
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OPC Server: Start Stop Pause getData(again use) DYMOLA MATLAB

I am using a Dymola OPC server DYMOLA HAS these many tags which can be controlled using SimControl.Run, SimControl.Stop ,etc here i wrote it in MATLAB hostInfo = opcserverinfo('localhost'); da =…
Rohit gupta
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How to get started developing an OPC Xi (.NET 3.0 WCF Services) Server (Service)

I would like to implement an OPC Server using the latest standard version: OPC Xi. My purpose is not providing a service for real usage, I just would like to develop a finctional server returning data from sensors of a certain industrial station…
Andry
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