pylogix

library1.1.5pypypi✓ verified 87d ago

pylogix is a Python library for reading and writing Rockwell Automation Logix-based PLCs (ControlLogix, CompactLogix, MicroLogix, etc.) over Ethernet/IP. Current version is 1.1.5, released occasionally with bug fixes and minor enhancements.

database serialization communication

pip install pylogix

github ↗package ↗

INSTALL

IMPORT

SIG · PYLOGIX

pylogix

databasepythonv1.1.5

Install

1.6s avg

Import

22ms

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v1.1.5 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.024s · 18.4MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.6s · import 0.020s · 19MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

PLC

✓ from pylogix import PLC

Correct import for the PLC class.

Basic read operation: initialize PLC, set IP, read a tag, and print the value.

from pylogix import PLC with PLC() as comm: comm.IPAddress = '192.168.1.10' ret = comm.Read('MyTag') if ret.Value is not None: print(ret.Value)

Debug

Known issues

gotchaThe PLC object modifies its internal state (like IPAddress) after each read/write call. Always set IPAddress before each transaction or use a context manager.

fix

Set comm.IPAddress immediately before calling Read/Write, or use 'with PLC() as comm:' which resets on exit.

affects: all

gotchaTag names must be exact and case-sensitive. Rockwell PLCs often require the full path (e.g., 'Program:MainProgram.MyTag').

fix

Verify tag name in the PLC’s tag database; use the full path including program scope if needed.

affects: all

breakingVersion 0.7.0 changed the API: 'read' and 'write' functions were replaced by methods on the PLC object. Old code using 'from pylogix import read' breaks.

fix

Update to use 'from pylogix import PLC' and instantiate PLC() object, then call .Read() and .Write().

affects: <0.7.0

Errors

Common errors & fixes

AttributeError: module 'pylogix' has no attribute 'read'

Using old import 'from pylogix import read' after upgrading to version >=0.7.0.

fix

Use 'from pylogix import PLC' and then call plc.Read() instead.

pylogix.exceptions.ConnectionError: Unable to connect to the PLC

Incorrect IP address, PLC not reachable, or wrong CIP path.

fix

Verify IP address, ensure PLC is on the same subnet, and check firewall settings. If using a ControlLogix, set comm.ProcessorSlot if not 0.

pylogix.exceptions.TagError: Tag Not Found

Tag name does not exist or incorrect path (e.g., missing program scope).

fix

Use the exact tag path including program scope (e.g., 'Program:MainProgram.MyTag') and confirm case sensitivity.

Upgrade

Version history

1.1.5latest on PyPI · released Feb 23, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

30 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/dmroeder/pylogix ↗

packagehttps://pypi.org/project/pylogix/ ↗