pycomm3 - A Python Ethernet/IP library for communicating with Allen-Bradley PLCs.¶
pycomm3 started as a Python 3 fork of pycomm, which is a Python 2 library for
communicating with Allen-Bradley PLCs using Ethernet/IP. The initial Python 3 port was done
in this fork and was used as the base for
pycomm3. Since then, the library has been
almost entirely rewritten and the API is no longer compatible with
pycomm. Without the
hard work done by the original
pycomm3 would not exist. This
library seeks to expand upon their great work.
pycomm3 includes 3 drivers:
This driver is the base driver for the library, it handles common CIP services used by the other drivers. Things like opening/closing a connection, register/unregister sessions, forward open/close services, device discovery, and generic messaging.
This driver supports services specific to ControlLogix, CompactLogix, and Micro800 PLCs. Services like reading/writing tags, uploading the tag list, and getting/setting the PLC time.
This driver supports basic reading/writing data files in a SLC500 or MicroLogix PLCs. It is a port of the
pycommwith minimal changes to make the API similar to the other drivers. Currently this driver is considered legacy and it’s development will be on a limited basis.
PLCs can be used to control heavy or dangerous equipment, this library is provided “as is” and makes no guarantees on its reliability in a production environment. This library makes no promises in the completeness or correctness of the protocol implementations and should not be solely relied upon for critical systems. The development for this library is aimed at providing quick and convenient access for reading/writing data inside Allen-Bradley PLCs.
The package can be installed from PyPI using
pip install pycomm3 or
python -m pip install pycomm3.
Optionally, you may configure logging using the Python standard logging library. A convenience method is provided to help configure basic logging, see the Logging Section in the docs for more information.
Python and OS Support¶
pycomm3 is a Python 3-only library. The minimum supported version of Python is 3.6.1 and has been tested up to 3.9.
There should be no OS-specific requirements and should be able to run on any OS that Python is supported on.
Development and testing is done primarily on Windows 10. If you encounter an OS-related problem, please open an issue
in the GitHub repository and it will be investigated.
Python 3.6.0 is not supported due to
NamedTuple not supporting
default values and methods until 3.6.1
- Getting Started
- Driver Usage
- Basic Reading and Writing Tag Examples
- Examples of Working with the Tag List
- Generic Messaging
- API Reference
- CIP Reference
- Release History