标准摘要
[中文适用范围]： 数据链路层为自动化环境中的设备提供基本的时间关键型消息传递通信。该协议以循环异步方式向预先选定的“主”数据链路实体子集提供通信机会，并按顺序向每个数据链路实体提供通信机会。其他数据链路实体仅在主数据链路实体允许和委托的情况下进行通信。对于给定的主设备，其与其他数据链路实体的通信可以是循环的，也可以是具有优先访问的非循环的，或者是两者的组合。该协议提供了一种以公平方式共享可用通信资源的方法。它提供了时间同步和等时操作的规定。 [外文原描述]： IEC 61158-4-3:2010 describes the protocol that provides communication opportunities to a pre-selected "master" subset of data-link entities in a cyclic asynchronous manner, sequentially to each of those data-link entities. Other data-link entities communicate only as permitted and delegated by those master data-link entities. For a given master, its communications with other data-link entities can be cyclic, or acyclic with prioritized access, or a combination of the two. This protocol provides a means of sharing the available communication resources in a fair manner. There are provisions for time synchronization and for isochronous operation. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are: - Corrections in Table A.15 and Table A.16; - Expired patent removed and added new patents. This bilingual version (2012-07) corresponds to the monolingual English version, published in 2010-08.
英文名称Industrial communication networks - Fieldbus specifications - Part 4-3: Data-link layer protocol specification - Type 3 elements