GB/T 47014.1-2026 Industrial communication networks—Fieldbus specifications—Type 2 elements:EtherNet/IP,ControlNet and DeviceNet specifications—Part 1:Data-link layer service definition

Scope

1.1 Overview
This document provides common elements for time-critical message communication between devices in an automated environment. The term "time-critical" refers to the existence of a time window within which one or more specified actions must be completed with a defined level of determinism. If these actions are not completed within the time window, it may lead to the failure of the application requesting the action, and pose corresponding risks to devices, factories, and even human lives.
This document defines the externally visible services provided by the Type 2 fieldbus data link layer in the following abstract form:
a) Primitive actions and events of the service;
b) Parameters associated with each primitive action and event, and the form they take;
c) The interrelationships between these actions and events, and their valid sequencing.
The purpose of this document is to define the services provided to:
—— Type 2 fieldbus application layers located at the interface between the application and data link layers of the fieldbus reference model;
—— System management located at the interface between the data link layer and system management of the fieldbus reference model.
Type 2 DL services provide both connection-oriented and connection-less subsets of the service set specified in ISO/IEC 8886.
1.2 Specifications
The primary purpose of this document is to specify the characteristics of conceptual data link layer services applicable to time-critical communication, which serve as a supplement to the OSI basic reference model and guide the development of time-critical communication data link protocols. The secondary purpose is to provide a path for migrating from existing industrial communication protocols.
This document can serve as the basis for formal DL programming interfaces (DL-Programming-Interfaces). However, it is not a formal programming interface. Any such

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