标准摘要
[中文适用范围]： 概述 数据链路层在自动化环境中的设备之间提供基本的时间关键型消息通信。该协议为所有参与的数据链路实体提供通信机会：a）根据预先建立的时间表以同步启动循环方式@和b）根据每个数据周期的请求以循环或非循环异步方式@ -链接实体。因此，该协议的特点是异步提供循环和非循环访问，但每个周期同步重新启动 [外文原描述]： IEC 61158-4-13:2014 specifies procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed data-link service provider and the structure of the fieldbus DLPDUs used for the transfer of data and control information by the protocol of this standard, and their representation as physical interface data units. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes are: - addition of a new communication class; - editorial improvements and editorial corrections.
英文名称Industrial communication networks - Fieldbus specifications - Part 4-13: Data-link layer protocol specificationn - Type 13 elements