libplctag ☆
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Description:
Portable and simple API for accessing AB PLC data over Ethernet
Type: Formula  |  Latest Version: 2.6.13@0  |  Tracked Since: Oct 19, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: plc ethernet-ip scada automation industrial-control
Install: brew install libplctag
About:
libplctag is a portable C library that provides a simple and efficient API for reading and writing data in Programmable Logic Controllers (PLCs) from Rockwell Automation (Allen-Bradley). It abstracts the complexities of the EtherNet/IP protocol, allowing developers to easily access tag data without deep networking expertise. The library is designed for cross-platform compatibility, making it ideal for building custom SCADA, HMI, or data acquisition applications.
Key Features:
  • Portable C library with bindings for Python, Java, and C#
  • Simple API for reading/writing PLC tags over EtherNet/IP
  • Supports both implicit (IO) and explicit messaging
  • Cross-platform (Linux, Windows, macOS, embedded systems)
  • No external dependencies required for the core library
Use Cases:
  • Building custom SCADA or HMI interfaces for Allen-Bradley PLCs
  • Integrating PLC data into Python scripts for data analytics
  • Creating bridge applications between PLCs and modern databases
  • Developing embedded systems that communicate with factory floor equipment
Alternatives:
  • Snap7 – Focuses on Siemens S7 PLCs, whereas libplctag is specifically for Allen-Bradley/Rockwell Automation.
  • libmodbus – A general-purpose Modbus library; not compatible with the proprietary EtherNet/IP protocol used by AB PLCs.
Version History
Detected Version Rev Change Commit
Oct 19, 2025 8:36pm 0 VERSION_BUMP dbfc60ed
Sep 16, 2025 8:11am 0 VERSION_BUMP 956fb0fe
Sep 13, 2024 2:06pm 0 VERSION_BUMP 18e19bf5
Sep 3, 2024 10:45pm 0 VERSION_BUMP 141723b7
Jul 26, 2024 11:59pm 0 VERSION_BUMP a5a6afc9
Jul 26, 2024 6:42pm 0 VERSION_BUMP 7b3a0b6e
Jun 14, 2024 6:36pm 0 VERSION_BUMP a973d960
Dec 2, 2022 7:06am 0 VERSION_BUMP e9552102
Dec 2, 2022 7:06am 0 VERSION_BUMP 33166bc2
Dec 1, 2022 2:00pm 0 VERSION_BUMP 4336b0a0
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