GSDML

General Station Description Markup Language (GSDML) is an XML-based description file format used to describe industrial devices for PROFINET and related industrial Ethernet networks. It is designed to be read by engineering tools so that devices can be automatically recognized, configured, and integrated into a network without extensive manual parameter entry.

A GSDML file contains metadata about the device such as vendor name, device name and model, hardware revision, and a device category (for example IO device or controller). It also specifies device identification codes, supported features, and compatibility information. Importantly, the file defines the device’s communication requirements and data structures, including the size and mapping of input and output data (I/O data), data types, and how these map to the real device I/O. Additional sections may describe alarm and diagnostics capabilities, redundancy options, firmware compatibility, and other vendor-specific options. The content adheres to the GSDML XML schema, which is maintained and published by PROFIBUS & PROFINET International (PI).

Usage and impact: manufacturers generate and distribute GSDML files for their PROFINET devices, and engineering tools use them to populate device catalogs. During project configuration, engineers select a device from the catalog, import its GSDML, and automatically configure IO mapping, device addressing, and communication parameters. This facilitates interoperability, reduces manual configuration errors, and supports consistent device descriptions across engineering environments. GSDML files are typically updated to reflect firmware changes or new features and are a standard element in PROFINET device integration.