This is a PROFIBUS software stack implementing the layers 1 (PHY), 2 (FDL) and 7 (DP) of the PROFIBUS protocol.

We are currently able to talk to a Siemens ET-200S slave, read its inputs and write to the outputs. So the basic hardware (OSI layer 1) is implemented and works as expected. Software (OSI layer 2 and 7) is work in progress. Most of the implemented features work correctly. A the Raspberry Pi can act as a DP-Master (class 1) with the current stack.

Performance:
A typical Data_Exchange (that is sending and receiving user data) cycle takes about 0.3 milliseconds with CPython and 0.1 milliseconds with PyPy on a Raspberry Pi 2.

The awlsim Soft-PLC software can be used to control hardware connected to PROFIBUS-DP
See the awlsim and PiLC pages for details.

pyprofibus can be used to connect LinuxCNC to PROFIBUS-DP slaves.

A LinuxCNC example configuration is included in pyprofibus. See the linuxcnc-demo subdirectory.

pyprofibus includes an example_dummy.py executable file that can be used to run the stack without any actual PROFIBUS hardware. The dummy PHY will emulate a simple slave device in such a way that example_dummy.py can run a DPM1 on that virtual PHY device.
Feel free to use this dummy to experiment with the stack.

• pyprofibus release 1.4 .tar.xz archive
  29 May 2019 / PGP signature
• Older pyprofibus releases can be found here.

Latest bleeding edge pyprofibus can be downloaded using the Git version control system as follows:

git clone https://git.bues.ch/git/pyprofibus.git

git clone http://git.bues.ch/git/pyprofibus.git

git clone git://git.bues.ch/pyprofibus.git

or by downloading the pyprofibus snapshot archive.
To browse the Git repository online, go to the git web interface.
A mirror of the repository is available on GitHub, GitLab, Bitbucket and on NotABug.org.
If you want to contribute to pyprofibus, please read the contribution guidelines first.

If you find any bugs in pyprofibus or if you have any suggestion for new features, we would like to hear from you.
Your help is greatly appreciated and will help to create better software and improve the overall experience for everybody. So don't hesitate to report anything that that limits your pyprofibus usage.

• Please file an issue at Github
• Alternatively you may send your report via e-mail

If you have got any code improvements or other improvements that should be merged into the project, please send such enhancements to the pyprofibus maintainer.

• Please send a pull request via Github
• or alternatively send any patches to the project via e-mail

Please read the contribution guidelines first.

Copyright (C) Michael Büsch
Licensed under the terms of the GNU General Public License version 2 . See the sourcecode for details.