---
id: pylogix
version: "1.1.5"
license: Apache License 2.0
license_treatment: permissive
maintenance: active
---

# pylogix — Read/Write Rockwell Automation Logix based PLC's

License: permissive · Maintenance: active · Downloads: 236.1K/mo

## 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 above — verify before relying.

Pylogix reads and writes tag values from Rockwell Automation ControlLogix, CompactLogix, and Micro8xx PLCs over Ethernet I/P using Python, with no external dependencies.

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

pip install pylogix
uv add pylogix
poetry add pylogix

## Installing pylogix

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.

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)

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.

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: unspecified
- Install friction: low
- Maintenance: active
- Downloads: 236.1K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

rockwell plc communication python, controllogix ethernet ip driver, read write plc tags python, compactlogix python interface, industrial automation plc control, logix plc ethernet protocol, plc tag read write library, industrial-automation, plc-communication, ethernet-ip

[View on SkillFed](https://skillfed.io/packages/pylogix) · [View on PyPI](https://pypi.org/project/pylogix/)