IEC 61158-5-10:2019 (E) defines the services provided to the FAL user at the boundary between the user and the application layer of the fieldbus reference model, and Systems Management at the boundary between the application layer and Systems Management of the fieldbus reference model. This standard specifies the structure and services of the IEC fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545). This fourth edition cancels and replaces the third edition published in 2014 and constitutes a technical revision which includes the following significant technical changes with respect to the previous edition: – integration of system redundancy basic functionality; – integration of dynamic reconfiguration basic functionality; – integration of reporting system basic functionality; –-integration of asset management basic functionality; – integration of media redundancy ring interconnection basic functionality.