IEC 61158-4-2:20 23是为促进自动化系统组件互连而生产的系列之一。它与IEC 61158中描述的“三层”现场总线参考模型定义的集合中的其他标准相关？1. 数据链路协议通过利用可从物理层获得的服务来提供数据链路服务。本文档的主要目的是提供一组用于通信的规则，该规则以在通信时由对等数据链路实体(DLE)执行的过程来表示。这些通信规则旨在为开发提供良好的基础，以服务于各种目的: -作为实施者和设计者的指南； -用于测试和采购设备； -作为允许系统进入开放系统环境的协议的一部分； -作为对OSI内部时间关键通信理解的改进。

IEC 61158-4-2:2023 is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the "three-layer" fieldbus reference model described in IEC 61158？1.
The data-link protocol provides the data-link service by making use of the services available from the physical layer. The primary aim of this document is to provide a set of rules for communication expressed in terms of the procedures to be carried out by peer data-link entities (DLEs) at the time of communication. These rules for communication are intended to provide a sound basis for development in order to serve a variety of purposes:
- as a guide for implementers and designers;
- for use in the testing and procurement of equipment;
- as part of an agreement for the admittance of systems into the open systems environment;
- as a refinement to the understanding of time-critical communications within OSI.