IEC 61158-5-2:2019

IEC 61158-5-2:2014 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 third edition cancels and replaces the second edition published in 2010 and constitutes a technical revision. The main changes are: - Updates of definitions used by the Time Sync ASE; - Corrections to numbering of services in 6.2; - Addition of "member" and object specific services in 6.2.1.2.1, 6.2.1.2.3, 6.2.1.3.1, 6.2.1.3.20 to 6.2.1.3.23, 6.2.1.3.28, and 6.5; - Updates of Identity ASE in 6.2.1.2.2; - Updates of Assembly ASE in 6.2.1.2.3; - Updates of Message Router ASE in 6.2.1.2.4; - Updates of Time Sync ASE in 6.2.1.2.6; - Updates of FAL service status codes in 6.2.1.3.3; - Miscellaneous clarifications of FAL services in 6.2.1.3.4 to 6.2.1.3.19; - Updates of Connection Manager ASE in 6.2.2; - Updates of Connection ASE in 6.2.3; - Removal of obsolete transport classes 4 to 6 in 6.3.1, 6.3.3 and 6.4; - Miscellaneous editorial corrections.

IEC 61158-5-2:2023 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term "time-critical" is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life.

IEC 61158-5-26:2023 provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 26 fieldbus. The term "time-critical" is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This document defines in an abstract way the externally visible service provided by the Type26 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.