Stack Overflow
Stack Overflow

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
4
votes
3 answers

OPC server access remotely using OPCDA.NET tools

I am developing OPC Client in windows C#. I have developed the code and reading OPC Items on Sampling as well as event based (OnDataChange). When I am working with local machine then my code works fine with both Sampling as well as OnDataChange, but…
vrushali
  • 59
  • 3
  • 6
4
votes
2 answers

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
  • 93
  • 1
  • 1
  • 6
4
votes
1 answer

OPC dll - How to retrieve tags value in bulk

I'm using OPCSiemensDAAutomation dll with C# .NET to retrieve tag's value from OPC Server. I managed to retrieve the values using QueryAvailableProperties() and GetItemProperties(), but the objective is to retrieve 500k tags value per request. I…
user3424002
  • 43
  • 3
4
votes
3 answers

Create an OPC client with OpenScada UTGARD

I´ve connected a PLC to Matrikon opc universal server, now my task is to connect the OPC server to a client based in Java. Im using jinterop libraries and i think utgard would be really useful for me but i dont really know how to start. I can not…
Guillermo
  • 51
  • 1
  • 2
  • 3
4
votes
1 answer

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
  • 3,467
  • 5
  • 36
  • 59
4
votes
0 answers

How to write to a string tag in an OPC UA server in C#?

I am using an SDK from Unified Automation that is essentially some C# source code that creates and runs an OPC UA Server. At the moment, I am able to write only to data tags that are either initialized as integers or doubles due to the nature of the…
Conor Walsh
  • 41
  • 3
4
votes
2 answers

How to create a OPC tag runtime

I have a Kepware OPC server and I am able to connect with my client (OPC Foundation UA lib). I created a device in Kepware and a group inside. I would like to read opc tags from the database and create them dynamically. How do I create an item with…
wh1sp3r
  • 1,640
  • 2
  • 17
  • 30
4
votes
1 answer

DCOM got error "2147942405" from the computer x.x.x.x when attempting to activate the server:

I have a program on my computer that runs as SYSTEM and it is trying to launch an exe(opc server) on a remote machine x.x.x.x. But I get a DCOM error in my machine's eventviewer. DCOM got error "2147942405" from the computer x.x.x.x when attempting…
Aparna
  • 835
  • 2
  • 23
  • 47
4
votes
1 answer

OPC UA-.NETStandardLibrary: the simplest way to access historical data

I'm facing a task which is to extract historical data from an OPC system, and then store these data into a standalone database for our BI team. Although I'm a experienced developer, but I never use OPC UA before. I found the latest library provided…
Christopher
  • 731
  • 6
  • 24
4
votes
4 answers

OPC UA How to read a datatype from the server

I can't seem to figure this one out: Before writing to a tag I need to know what data type it is expecting(the value that mywrite function receives is always a string). I realise you have to read the datatype from the server and here's my code to…
Muckers Mate
  • 399
  • 8
  • 23
4
votes
4 answers

Improving performance with OPC tags

I am working with a PC based automation software package called Think'n'Do created by Phoenix Contact It does real time processing, read inputs/ control logic / write outputs all done in a maximum of 50ms. We have an OPC server that is…
Tanj
  • 1,354
  • 1
  • 15
  • 25
4
votes
1 answer

Call OPC-UA method with UA-.NET

I am trying to call an OPC-UA method "ReadVar" from a SINUMERIK 840d, by using the Open OPC-UA.NET implementation at https://github.com/OPCFoundation/UA-.NET I have limited knowledge about how to use this stack implementation and wonder if somebody…
E8080
  • 41
  • 1
  • 3
4
votes
3 answers

OPC UA unique ID

I'm trying to build a OPC UA client application. I'd like to be able to identify a UA node uniquely in the OPC tree. I know that in OPC DA, a standard node id is a string with a '.' as a delimeter that I can use in order to identify a node. In OPC…
Idov
  • 5,006
  • 17
  • 69
  • 106
4
votes
1 answer

OPC UA : what does installing an LDS provide?

Given these 2 installations: A machine with 3 OPC UA servers. A machine with 3 OPC UA servers and a LDS. What is the difference in functionality? In particular, I would like to know: Is the installation of a LDS mandatory? What is the practical…
Laurent LA RIZZA
  • 2,905
  • 1
  • 23
  • 41
4
votes
2 answers

The relationship between OPC and DCOM

I am trying to grasp the link between OPC and DCOM. I have watched all four of the tutorials here and I think I have a good feeling for what OPC is, but in one of the tutorials (the third one 35 seconds in) the narrator states that OPC is based on…
ubiquibacon
  • 10,451
  • 28
  • 109
  • 179
1 2
3
…
43 44