标准摘要
[中文适用范围]: 1.1 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;b)按照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。1.2 规范 本标准规定了 a) 从一个数据链路用户实体到另一对等用户实体以及在形成分布式数据链路服务提供者的数据链路实体之间及时传输数据和控制信息的程序; b) 为所有参与的DL实体提供通信机会的程序,以顺序和循环的方式,以高达一毫秒的循环间隔进行确定性和同步传输; c) 在不影响时间关键数据传输的情况下,为时间关键数据传输和非时间关键数据传输提供可用的通信机会的程序; d) 为具有优先访问权的时间关键数据传输提供循环和非循环通信机会的程序; e) 基于标准 ISO/IEC 8802-3 介质访问控制提供通信机会的程序,并规定在正常操作期间添加或删除节点; f) 用于通过本标准的协议传输数据和控制信息的现场总线 DLPDU 的结构,以及它们作为物理接口数据单元的表示。1.3 程序 这些程序是根据以下方面定义的: a) 对等 DL 实体(DLE)之间通过现场总线 DLPDU 的交换进行交互; b) 同一系统中的DL服务(DLS)提供商和DLS用户之间通过DLS原语的交换进行交互; c) 同一系统中的 DLS 提供者和 Ph 服务提供者之间通过交换 Ph 服务原语进行交互。1.4 适用性 这些程序适用于系统之间的通信实例,这些系统支持 OSI 或现场总线参考模型的数据链路层内的时间关键型通信服务,并且需要能够在开放系统互连环境中互连。配置文件提供了一种简单的多属性方法来总结实现的功能,从而总结其对各种时间关键的通信需求的适用性。1.5 一致性 本标准还规定了实施这些程序的系统的一致性要求。本标准不包含证明符合此类要求的测试。 [外文原描述]: IEC 61158-4-14:2007 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; - procedures for giving communications opportunities to all participating DL entities, sequentially and in a cyclic manner for deterministic and synchronized transfer at cyclic intervals up to one millisecond; - procedures for giving communication opportunities available for time-critical data transmission together with non-time-critical data transmission without prejudice to the time-critical data transmission; - procedures for giving cyclic and acyclic communication opportunities for time-critical data transmission with prioritized access; - procedures for giving communication opportunities based on standard ISO/IEC 8802-3 medium access control, with provisions for nodes to be added or removed during normal operation; - 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 first edition and its companion parts of the IEC 61158-4 subseries cancel and replace IEC 61158-4:2003 and constitutes a technical addition. This part and its Type 14 companion parts also cancel and replace IEC/PAS 62409, published in 2005. This edition includes the following changes: - deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data link layer, for lack of market relevance; - addition of new types of fieldbuses; - division of this part into multiple parts numbered -4 1, -4 2, , -4-19. This bilingual version (2015-06) corresponds to the English version, published in 2007-12.
英文名称Industrial communication networks - Fieldbus specifications - Part 4-14: Data-link layer protocol specification - Type 14 elements