PLCopen is an organization that develops and maintains standards and guidelines for the programming of Programmable Logic Controllers (PLCs). PLCopen is a global organization with members from various industries, including automation, machinery, and process control.

PLCopen develops and maintains a number of standards and guidelines for the programming of PLCs, including:

    IEC 61131-3: a standard for programming languages used in PLCs
    PLCopen XML: a data model and language for describing PLC programs
    PLCopen Motion Control: a standard for motion control programming in PLCs
    PLCopen Safety: a standard for programming safety-related functions in PLCs

These standards and guidelines are designed to improve the interoperability and compatibility of PLC programs and software, and to make it easier to develop and maintain PLC systems. PLCopen also provides training and certification programs for PLC programming professionals.

PLCopen is a non-profit organization that is supported by its members, who contribute to the development and maintenance of its standards and guidelines. PLCopen is recognized as a leading authority on PLC programming, and its standards and guidelines are widely used in the automation industry.