GB/T 47014.2-2026 Industrial communication networks—Fieldbus specifications—Type 2 elements:EtherNet/IP,ControlNet and DeviceNet specifications—Part 2:Data-link layer protocol specification

Scope

1.1 Overview
The data link layer provides basic time-critical message communication between devices in an automated environment.
This document specifies the main protocol with the following characteristics:
—— This protocol provides communication opportunities for all participating data link entities in a sequential, cyclic synchronous manner. Foreground scheduling access can be used for time-critical activities, while background unscheduled access can be used for non-time-critical activities.
—— It provides deterministic and synchronized transmission with a cycle interval of up to 1 ms for devices separated by a distance of 25 km. While normal operation continues, this performance can be dynamically and online adjusted by reconfiguring the parameters of the local link. Similarly, DL connections and new devices can be added or removed during normal operation.
—— This protocol provides a method of maintaining clock synchronization with an accuracy of better than 10 μs across the entire extended link.
—— This protocol optimizes the data transmission efficiency of data link entities actively acquiring multiple data streams by concatenating multiple DLSDUs and related DLPCIs into a single DLPDU.
—— The maximum system scale is an unlimited number of 99 nodes, each with 255 DLSAP addresses. Each link has up to 2^24 associated peers and publishers DLCEPs.
This document specifies additional lower-layer protocols or implementations of additional lower-layer protocols used in conjunction with ISO/IEC/IEEE 8802-3.
This document specifies a corresponding set of objects that provide a consistent management interface for the lower layer.
1.2 Specifications
This document specifies:
a) The procedures for timely transmission of data and control information from a data link user entity to a peer user entity, and among data link entities that form a distributed data link service provider;

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