> For the complete documentation index, see [llms.txt](https://infosys.selmotech.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-structure-and-standard/selmo-technical-standard-and-structure/description-selmo-plc-code.md). # Description: Selmo PLC code The PLC code is created in the Structured Text (ST) programming language and exported as PLCopen XML. This can then be imported into the chosen controller and loaded. Structured Text (ST) is a high-level programming language developed for programmable logic controllers (PLCs). It uses a syntax similar to high-level languages such as Pascal or C and allows the user to describe complex processes in a simple and readable form. PLCopen is an international association dedicated to the standardization of PLC programming and control. One of its goals is to create a uniform programming environment for PLCs in order to facilitate interoperability between different systems and manufacturers. PLCopen also supports the use of Structured Text as one of the programming languages for PLCs. Together, Structured Text and PLCopen enable developers to program PLC systems easily and efficiently while ensuring interoperability and compatibility between systems. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-structure-and-standard/selmo-technical-standard-and-structure/description-selmo-plc-code.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.