GB/T 47014.3-2026 Industrial communication networks—Fieldbus specifications—Type 2 elements:EtherNet/IP,ControlNet and DeviceNet specifications—Part 3:Application layer service definition

Scope

The Fieldbus Application Layer (FAL) provides users with a method of accessing the Fieldbus communication environment. In this regard, FAL can be considered a "window between corresponding applications".
This document provides basic elements for time-critical and non-time-critical message communication between applications and Type 2 Fieldbus-specific materials in an automation environment. The term "time-critical" is used to indicate the existence of a time window within which one or more specified actions must be completed with a defined level of determinism. Failure to complete the specified actions within the specified time window could lead to failure risks for the application requesting the actions, thereby endangering the safety of equipment, factories, and even human lives.
This document defines the externally visible services of the Type 2 Fieldbus Application Layer in an abstract form as follows:
a) An abstract model for defining application resources (objects) that users can operate through the use of FAL services;
b) The actions and events of the service primitives;
c) The parameters associated with each primitive action and event, as well as the formats they use;
d) The interrelationships between these actions and events and their valid sequence.
This document aims to define services to be provided to:
a) FAL users at the interface between the user and application layers of the Fieldbus reference model;
b) System management at the interface between the application layer and system management of the Fieldbus reference model.

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