pylogix
Read/Write Rockwell Automation Logix based PLC's
Decision gist · record as of 2026-08-14
Yes. Pylogix is the standard open-source choice for Rockwell PLC communication in Python. It has no dependencies, is actively maintained, carries a permissive license, and solves a specific and well-defined problem. Install it if you need to read or write tags on a supported Rockwell PLC model; do not install if your PLC is an older Rockwell model or a different brand.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Target PLC must be a ControlLogix, CompactLogix, or Micro8xx model programmed with RSLogix5000/Studio5000 or Connected Components Workbench; other PLC brands and older protocols (PLC5, SLC, MicroLogix) are not supported.
- Low friction: the package is a pure-Python wheel with no runtime dependencies, installs quickly, and is actively maintained with a recent release.
License · maintenance · safety
Apache License 2.0 (permissive) — Apache 2.0 permissive license allows free use, modification, and distribution in commercial and open-source projects with minimal restrictions.
last release 2026-02-23 (172 days) · last repo commit 2026-05-18 · 722 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 236,105 downloads/mo, #8,990 on PyPI
Alternatives
Verify before relying
pip install pylogix
from pylogix import PLC
with PLC() as comm:
comm.IPAddress = '192.168.1.9'
ret = comm.Read('MyTagName')
print(ret.TagName, ret.Value, ret.Status)- Whether the package works reliably with RSEmulate and what additional configuration may be needed beyond the documented steps.
- Performance characteristics when reading/writing large numbers of tags or high-frequency polling scenarios.
- Compatibility with Python versions beyond 2.7 and 3.6 (the fact sheet lists only these classifiers).
What it is and what it does
Pylogix is a communication driver for reading and writing tag values on Rockwell Automation PLCs (ControlLogix, CompactLogix, Micro8xx) over Ethernet I/P. It abstracts the low-level protocol details, letting you connect to a PLC by IP address and issue read/write commands using simple Python method calls. The library returns a Response object containing the tag name, value, and status for each operation.
The package has no external dependencies and installs as a pure-Python wheel, making it quick to set up in any Python environment. It is designed specifically for PLCs programmed with RSLogix5000/Studio5000 or Connected Components Workbench; older Rockwell models (PLC5, SLC, MicroLogix) and non-Rockwell brands are not supported. The maintainer provides examples and documentation for common tasks and maintains an active Discord community for support.
Use it for
- Read sensor values and discrete states from a ControlLogix PLC in a Python monitoring or data-logging application.
- Write setpoints or control commands to a CompactLogix PLC from a Python script or web service.
- Automate testing of PLC logic by scripting tag reads and writes in a test harness.
- Build a custom HMI or dashboard that communicates with a Micro8xx PLC over Ethernet I/P.
- Integrate PLC data into a Python-based industrial analytics or historian system.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Pylogix is the standard open-source choice for Rockwell PLC communication in Python. It has no dependencies, is actively maintained, carries a permissive license, and solves a specific and well-defined problem. Install it if you need to read or write tags on a supported Rockwell PLC model; do not install if your PLC is an older Rockwell model or a different brand.
Install
pylogix on PyPI
Before you install
Low friction: the package is a pure-Python wheel with no runtime dependencies, installs quickly, and is actively maintained with a recent release.
Target PLC must be a ControlLogix, CompactLogix, or Micro8xx model programmed with RSLogix5000/Studio5000 or Connected Components Workbench; other PLC brands and older protocols (PLC5, SLC, MicroLogix) are not supported.
License in practice
Apache 2.0 permissive license allows free use, modification, and distribution in commercial and open-source projects with minimal restrictions.
Quickstart
pip install pylogix
from pylogix import PLC
with PLC() as comm:
comm.IPAddress = '192.168.1.9'
ret = comm.Read('MyTagName')
print(ret.TagName, ret.Value, ret.Status)Verify before relying
- Whether the package works reliably with RSEmulate and what additional configuration may be needed beyond the documented steps.
- Performance characteristics when reading/writing large numbers of tags or high-frequency polling scenarios.
- Compatibility with Python versions beyond 2.7 and 3.6 (the fact sheet lists only these classifiers).
Package facts
| License | Apache License 2.0 permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 172 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 236,105 / month, #8,990 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: Apache Software LicenseOperating System :: OS IndependentProgramming Language :: Python :: 2.7Programming Language :: Python :: 3.6 |
Evidence: pylogix-1.1.5-py2.py3-none-any.whl
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