Python code (error 'invalid class string') - by: support
From: OPC Labs Contact Form - L. Sent: Tuesday, November 29, 2016 1:52 PM ... hi, I run your example in python and get an error 'invalid class string'. please can you explain what i need to do to...
View ArticleGetting 'Read not completed' and 'Write not completed' errors while trying to...
Hi, I'm trying to read and write to a Softing S7 server running on localhost, but getting errors. I'm using OpcLabs.EasyOpc.DataAccess.EasyDAClient via the win32com client for Python. I've installed on...
View ArticlePotential Memory Leak? (Python) - by: support
From: C. Sent: Monday, November 13, 2017 1:20 PM To: Z. Subject: Potential Memory Leak? Hi Z., [..] using QuickOPC in Python and [..] may have found a small memory leak that I wanted to get your input...
View ArticlePython examples - by: filin
Hello! I have a small question. How I can register callback for subscribtion (i mean smth like ItemChanged)? Do you have any examples for it?
View ArticleQuickOPC in Python - by: hkhodabandehlou
Hello, I am trying to write a client code in Python using QuickOPC and have few questions: 1)Is there any way to read and write groups instead of reading and writing item by item? 2)Right now I am...
View Articlewin32com.client Not Found - Python - by: steve.korber
I'm trying out a trail version and I just want to make sure I can read a OPC-UA tag from out Ignition Server. I am using the Read.Main.py provided and I made some changes to the endpoint but the module...
View ArticleMethod Call in Python - by: Enrico
I'm trying to find an example how to use Python to call OPCUA Methods. My first question: when using the com interface is it at all possible to call methods? If yes would you have a link to an example?...
View ArticleRead ad Write multiple values - by: Jesus Rodriguez
Hi I have the following code to read and write: import win32com.client client = win32com.client.Dispatch('OpcLabs.EasyOpc.DataAccess.EasyDAClient') value = client.ReadItemValue('', 'CoDeSys.OPC.02',...
View ArticleDefine a "private" server, log data and export data - by: Peloso
Hi there, I'm a newbie in the OPC UA. I'm a mechanical engineer actually, but I'm down with my master thesis and I'm looking for a smart solution to some data manipulation. The goal is to take some...
View ArticleUpdate to Version 2020.2 - by: Enrico
Hello, I updated from version 2018.3 to version 2020.2. With version the 2018.3 the connectivity explorer was running fine (even today). After the update I get the following error message (see...
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Instantiate the client objects multiple times - by: mozesa
Hello! I would like to ask for some help. Currently I am using your trial version but in the end I would like to buy a QuickOPC Ultimate, but first I have to convince my boss. I am developing in Python...
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OPCuA durch eine Firewall oder einen ssh-Tunnel - by: Kannix
Hallo, hier in der Technikerschule München betreiben wir auf sehr niedrigem Niveau Programmierung mit OPCuA. Mit dem Toolkit von OPCLabs prgrammieren wir in Python Zugriffe auf diverse SPS-Stuerungen....
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ReadMultipleItems - by: Sakai
Hi , i did the example in python to test a OPC connection with the KitServer, and everthing went fine. But when i was trying to connect with another OPC server i receive a timeout and then, i get the...
View ArticlePackaging Python application using pythonnet - by: mozesa
Hello! I would like to ask for your kind help. I would like to deploy the application. I use clr and not win32com.client. Currently the app uses the assemblies from path: c:\Program Files (x86)\OPC...
View ArticleContinuous instantiation of EasyUAClient causes ever-growing (?) memory usage...
*Hello*, I am doing long running tests, and I noticed that my bare-bone python app memory usage was over 1 GB, it started from 90 MB. I could boil down the issue to this code. The write_value function...
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Subscribe to events - by: mozesa
Dear OPCLabs, I would like to ask for your kind help. This snippet works fine, I got the events right. There is a Python project in which I have to use another OPCUA implementation (FreeOPCUA) - the...
View ArticleAlarms and Events - by: K-R IKE
Hello. We are considering purchasing your product and are using your free trial version at the moment. We would like to see how OPC Alarms & Events operate, but OnNotification doesn't execute with...
View ArticleAlarm detection opc ua - by: Paulaaaa
I am working with opc ua, from ua expert and I would like to know how to report that an alarm has been triggered. I am working with python from rasa and I would like to know how to detect that an alarm...
View ArticleSubscribeMultiple Example using Python - by: jgonzalez
Hello, I have a customer that is working on a client application using Python. The customer is requesting an example of "Subscribe to Multiple". Our team's knowledge of the python language is very...
View ArticleUsing Python with Quick OPC - by: jnickles
I currently have a PLC from which I am trying to pull data and place into an excel chart for every day that the machine is running. I currently have a python script that pulls data from an excel sheet...
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