DIN EN IEC 61158-5-28:2025-05

This part of IEC 61558 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 28 fieldbus. The term "time-critical" is used to represent the presence of a time-window, in which one or more specified actions are required to be completed with some defined level of certainty. This document defines in an abstract way the externally visible service provided by the different Types of the 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 document applies only to the CPF22 AUTBUS communication profile family. This document can be used as a guide by developers of application programming interfaces in an industrial field environment for automation controllers.