BadNodeIdUnknown error - by: samirhaj
Hello, I am running an application under .Net framework with using Opclab sdk. When I start my application to read/write values of different types (boolean, integer, float, etc) , it crashes with the...
View ArticleEasyDAClient connections and subscriptions - by: mlebelle
We are using the easydaclient in a Visual Basic 6 development environment. We need to communicate with an ABB OPC server. This ABB OPC server does not fully support asynchronous (subscriptions) OPC...
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OpcLabs.BaseLib.Runtime.InteropServices.ExtendedCOMException (unexpected) -...
I have today encountered this weird and unexpected error. The app has worked without a problem for a few months before. Google did not find anything useful. All advises are welcome!!! InnerException...
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AVAEVA OPC UA node InTouch Alarm Groups not browsable - by: rhaubner
Hello community, we were using QuickOPC with especially the Excel Option together with KepServer running on our old Wonderware HMI. Now we are about upgrading to AVEVA HMI 2020 R2 SP1, the successor...
View ArticleMemory leak in QuickOPC nuget - by: janko.mihelic@adnet.hr
Hello, We found out that by subscribing to OPC UA events and value changes in a way shown by example posted on github page github.com/lermix/OpcLabBug/tree/master/OpcLabsBug process memory piles up. We...
View ArticleOPC UA subscription - No notifications for some nodes on MOPS server - by:...
Hello, I encoutered strange bahaviour of our client with one MOPS OPC UA server. We do not get any notification when data are changed for some nodes. Also there is not even an initial notification...
View ArticleQuick opc UA in.net - by: vipul
We connect a kepware server (UA) and make a client application in visual studio .Net 6.0 (WPF C#). So it is compulsory to install a quick opc ???? With out install a Quick opc is it possible to connect...
View ArticleVBA Managed Resource Licens Store sample code? - by: jgonzalez
Hello, I have a customer currently using 2022.1 on VS 2019 16.11.19, and 4.7.2 Framework to develop their custom application using VBA. They are working on deploying the application and are trying to...
View ArticleDynamic addressing of array position in a PLC using EasyUAClient - by:...
Is there a known bug concerning dynamic addressing of array position using EasyUACLient? I have had it working with DA clients (havn't tried it yet though with the EasyDAClient) . EasyUAClient can...
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OPC DA browsing error. - by: yong
Hello I'd like to have some information about these below. - AnotherOPC Client program brings opc data. - However, I can't get the opc data through the opc library. * Other clients bring data, but I...
View Articleomron opc reading and writing variables - by: Fietta
Hi, is the first time for me using opc ua communication and i'm having some issues whit my Omron PLC: i have write some lines of code to read a variable but i don't understand whta value i have to set...
View ArticleCallback gets fired even when value hasn't changed - by: aris
It seems that when I call EasyDAClient::SubscribeItem, the callback gets fired with the old (current) value from the OPC server even though the value hasn't changed yet. Is this by design? If yes, is...
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Using QuickOPC 2020.2 (5.58) in .NET 6.0 - by: zaglerp
After migrating our solution (based on QuickOPC 2020.2) to .NET 6 we get this exception: LicensingException: Not allowed to run by the license "Multipurpose". You might be using a trial license, and...
View ArticleMemory leak in QuickOPC nuget - by: janko.mihelic@adnet.hr
Hello, We found out that by subscribing to OPC UA events and value changes in a way shown by example posted on github page github.com/lermix/OpcLabBug/tree/master/OpcLabsBug process memory piles up. We...
View ArticleCompile with multiple libraries - by: federica
Hi, I'm using QuickOPC COM, developing in C++. I need to compile my project with multiple versions of QuickOPC libraries in order to distruibute my projects with backward compatibility. I created...
View ArticleCrash with "ntdll.dll" error - by: federica
Hi, I'm using QuickOPC COM, developing in C++. On a pc of a customer I have some problem using my OPC client. The machine continue reports crash with problems with "ntdll.dll". The Quick OPC (2018.1)...
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URL : problem in run URL path after istancing - by: CHRDEI
Good morning, in my application I properly run a "URL" path with success with this code: Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri) { UseShellExecute = true }); After creating a connection...
View ArticleWhat is the proper way to check connection failure with the OPC server? - by:...
I use EasyDAClient::SubscribeItem to subscribe to a tag item. When there is a connection issue the EasyDAItemChangedEventArgs::Succeeded=false, which is expected and I can act accordingly in the...
View Articleomron opc reading and writing variables - by: Fietta
Hi, is the first time for me using opc ua communication and i'm having some issues whit my Omron PLC: i have write some lines of code to read a variable but i don't understand whta value i have to set...
View ArticleException: Cannot browse because the server is not compliant because it does...
Hi, We are getting this exception when trying to browse the RSLinx OPC server. When using Matrikon OPC Explorer, there is no problem. I appreciate your answer. Michael OPC NET API error - result ID:...
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