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Python OPC UA Client Examples

Introduction

Everything is provided as open source to provide examples on how to work and program with OPC UA. For the open source tools and examples there is no official TRUMPF support. Feel free to participate.

Requirements

  • Python >= Python 3.7
    • Version >= Python 3.11 is recommended due to startup performance improvements.
  • Python opcua-asyncio library >= 0.9.14

Examples

Generate certificate - gen_certificate.py

Library used in all examples to create the certificate if not yet created.

Show pending alarms - show_current_alarms.py

Example client to show the alarms and messages via OPC UA Alarms and Conditions.

Installation and Execution

With Python installed, the script file can be exuted with python exampleName.py. As an alternative a fully self contained .exe can be created with PyInstaller.

Detailed instruction:

  • Download and install Python >= Python 3.7. On installation set checkbox for adding to system path.

  • Install opcua-asnycio library >= 0.9.14 with pip3 install asyncua or upgrade with pip3 install --upgrade asyncua Behind a company proxy you may need to add the proxy server and trust servers. Search for proxy settings and look for the manual proxy server. pip3 install --trusted-host pypi.org --trusted-host files.pythonhosted.org --proxy=http://username:password@proxyserver:port asyncua

  • Download all files and copy them to a folder. Easiest way is to download all files of the github repository. Download zip.

  • Enter the folder containing the examples and execute the client example with python exampleName.py

  • On Linux if Python 2.x and Python 3.x are installed execute with python3 exampleName.py.

To create a self contained .exe on Windows which can be used on systems without Python installed:

  • Install PyInstaller with: pip3 install pyinstaller
  • Comment out line os.chdir(sys.path[0]) if it exists in python file.
  • Switch to folder and execute pyinstaller.exe --onefile exampleName.py. The result is in the "dist" directory.

License

The Python OPC UA Client examples are licensed under the MIT License.