![]() read/write of arrays of the above (arrays not tested on SLC 500).support for older Rockwell/Allen-Bradley such as PLC-5 PLCs (Ethernet upgraded to support Ethernet/IP), SLC 500 and MicroLogix with Ethernet via CIP.Support as for ControlLogix where possible.support for Rockwell/Allen-Bradley Micro 850 PLCs.tag listing, both controller and program tags.packet size negotiation with newer firmware (version 20+) and hardware.raw support for user-defined structures (you need to pull out the data piece by piece).read/write 32-bit and 64-bit IEEE format (little endian) floating point.read/write 8, 16, 32, and 64-bit signed and unsigned integers.support for Rockwell/Allen-Bradley ControlLogix(tm) PLCs via CIP-EtherNet/IP (CIP/EIP or EIP). ![]() Wrappers for higher level languages like C#/.Net, Julia etc.Extensive example programs showing use of all library features.Simple API with minimal use of language-specific data to enable easy wrapping in other languages.Uses protocol-specific features to increase performance. Low memory use and very high performance and capacity.Very stable API with almost no changes other than feature additions since 2012.Support for x86, ARM and MIPS, and probably others.Pure C library for portability across Linux, Windows and macOS as well as 32-bit and 64-bit.Open source licensing under the MPL 2.0 or LGPL 2+. ![]() ![]() We make no claims or warrants about the suitability of this code for any purpose.ĭo you know what you want already? Download it from the releases page! Features High Level Features Always use caution when accessing or programming PLCs! Note: PLCs control many kinds of equipment and loss of property, production or even life can happen if mistakes in programming or access are made. Old Stable Version: 2.4 WARNING - DISCLAIMER The library has been in production since early 2012 and is used by multiple organizations for many tasks including controlling radio telescopes, large and precision manufacturing, controlling fitness equipment, food handling and many, many more. Libplctag is an open source C library for Linux, Windows and macOS using EtherNet/IP or Modbus TCP to read and write tags in PLCs.
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