IEC 61158-5-2:2014

IEC 61158-5-2:2010(E) defines in an abstract way the externally visible service provided by the Type 2 fieldbus application layer in terms of an abstract model for defining application resources (objects) capable of being manipulated by users via the use of the FAL service, the primitive actions and events of the service; the parameters associated with each primitive action and event, and the form which they take; and the interrelationship between these actions and events, and their valid sequences. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are: - Clause 2 and Bibliography: update of normative and bibliographic references; - subclause 6.1.3: update lists with new objects; - subclause 6.2.1.2.6: update of the Time Sync ASE/object (to match new IEC 61558); - new subclause 6.2.1.2.7: new Parameter ASE/object; - subclause 6.2.1.3: update/add services for Time Sync and Parameter ASEs; - subclause 6.2.2.3: minor updates to the Connection Manager ASE services; - subclause 6.4: add Parameter ASE to the object table; - subclause 6.5: update contents of service table for Time Sync and Parameter ASEs.

IEC 61158-5-2:2019 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 Type 2 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. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - addition of a data type in 5.3.2; - clarifications of Object management ASE in 6.2.1; - extensions of General ASE in 6.2.1.2.1; - extensions/clarifications of Identity ASE in 6.2.1.2.2; - update of Message Router ASE in 6.2.1.2.4; - extensions/clarifications of Time Sync ASE in 6.2.1.2.6; - updates of Parameter ASE in 6.2.1.2.7; - updates of FAL ASE service specification in 6.2.1.3; - extensions/clarifications of Connection manager ASE in 6.2.2; - extensions/clarifications of Connection ASE in 6.2.3; - extensions/clarifications of Application type in 6.3.1.4.5. - miscellaneous editorial corrections.