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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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Difference Between OPC UA and OPC DA?

Please explain what is the Difference Between OPC UA and OPC DA ? In which condition which one should be used, and if any example can be provided for both OPC UA and OPC DA, it would be helpful
tanuj shrivastava
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Alternative to OPC-UA

Is there any decent alternative to OPC-UA as a solution for accessing process data of a system composed of various PLCs? Something that is platform independent and can "speak" with products of different brands ? I've heard of MQTT but it seems to be…
cid
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5 answers

OPC sample application for C#

Does anyone know a C# OPC client sample application? I'm looking for a good opensource one to learn about the protocol. I would prefer it if it uses OPC foundation .net core apis.
Sevki
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2 answers

What is the significance of "ns=2;s=" in an OPC node path?

I have noticed that all OPC tag Ids are prefixed with ns=2;s=. Some examples of possible NodeId values would be: ns=2;s=AcquisitionTimeRemaining ns=2;s=Status ns=2;s=Time I am wondering what the significance of this prefix is. Research: Someone…
Kyle Williamson
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13
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1 answer

OPC UA : minimal code that browses the root node of a server

I am using the OPC UA Foundation SDK to develop a small client. What would be the minimal C# code to: Connect to a server Browse the root node Print the immediate children's BrowseNames Quit? I am given the server endpoint (no discovery), security…
Laurent LA RIZZA
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12
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2 answers

What is a Historian?

What is the function of a historian in terms of OPC and PLC?
Rob_IGS
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12
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4 answers

Java opc client application

I am looking for some libraries and some examples to create an client OPC application in Java which could connect with opc server. Thanks in advance.
user1519221
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11
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2 answers

Understanding free OPC/UA code in python

I am working on OPCUA in python. I am using freeopc. I have used their server_minimal & client_minimal example and it is running fine. I am having some issues understanding the code. As far as I know the OPCUA stack, it has address space which is…
S Andrew
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10
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2 answers

Good open source OPC software

We are currently using a free trail version of KEP Server for our OPC to communicate with our PLC. We were wondering if anyone knows of any good open source OPC software.
Rob_IGS
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10
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1 answer

What do the different DCOM / COM security settings mean?

Our application uses COM and DCOM extensively, and so as part of that we need to ensure that the COM security permissions are correctly set up. I know that I can access these permissions under the Component Services MMC snap in and that I can set…
Justin
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9
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2 answers

C# OPC Applications Identical Code, but work differently

I am developing a C# custom OPC Client, I started off writing in a console app for quickness, everything works perfectly as I want it to. Then I decided to make a windows form application for a visual experience. The windows form application just…
SK2017
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3 answers

How to write an array tag in a VARIANT structure on an OpenOPC server

I'm trying to communicate with an OPC DA server and need to write in a tag which is in an array format. We can connect with a simulation server, read tags (int, real, array) and write tags (int, real, str). The problem comes when we need to write in…
Simon F.-Smith
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4 answers

Free OPC server for simulated values

I am developing an OPC client and need a free OPC server that can both simulate values ​​and set values static. Is there such a server freely available?
magol
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6
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2 answers

Is OPC UA the best way of getting data from many Scada systems?

In my company we have many distributed sites and each one uses a singular Scada system vendor (one uses Wincc, other place uses another...) and this systems works with almost the same kind of information. We need to retrieve some general data from…
user1038302
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OPC UA information model

Lets say I have multiple distributed complex machines. Each machine contains of multiple cpmplex devices. Each device has its own OPC UA server to monitore the device components. With an OPC UA client I want to read all the data items of the OPC UA…
CPA
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