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DIN EN 61158-4-17-2008
Industrial communication networks - Fieldbus specifications - Part 4-17: Data-link layer protocol specification - Type 17 elements
适用范围：1.1 GeneralThe data-link layer provides basic time-critical messaging communications between devices in anautomation environment.This protocol provides communication opportunities to all participating data-link entitiesa) in a cyclic asynchronous manner, sequentially to each of those data-link entities, andb) in a synchronous manner, either cyclically or acyclically, according to a pre-establishedschedule.The specified protocol also provides means of changing the set of participating data-link entitiesand of modifying the set of scheduled communications opportunities. When the set of scheduledcommunications opportunities is null, the distribution of communication opportunities to theparticipating data-link entities is completely asynchronous.Thus this protocol can be characterized as one which provides access asynchronously but with asynchronous overlay.1.2 SpecificationsThis standard specifiesa) procedures for the timely transfer of data and control information from one data-link user entityto a peer user entity, and among the data-link entities forming the distributed data-link serviceprovider;b) the structure of the fieldbus DLPDUs used for the transfer of data and control information by theprotocol of this standard, and their representation as physical interface data units.1.3 ProceduresThe procedures are defined in terms ofa) the interactions between peer DL-entities (DLEs) through the exchange of fieldbus DLPDUs;b) the interactions between a DL-service (DLS) provider and a DLS-user in the same systemthrough the exchange of DLS primitives;c) the interactions between a DLS-provider and a Ph-service provider in the same system throughthe exchange of Ph-service primitives.1.4 ApplicabilityThese procedures are applicable to instances of communication between systems which supporttime-critical communications services within the data-link layer of the OSI or fieldbus referencemodels, and which require the ability to interconnect in an open systems interconnectionenvironment.Profiles provide a simple multi-attribute means of summarizing an implementation’s capabilities, andthus its applicability to various time-critical communications needs.
实施日期： 2008-09-01
中标分类号： N10,L79 - 仪器、仪表
ICS分类号： 35.100.20,35.160,35.240.50 - 信息技术、办公设备
标准组织： DIN - 德国国家标准学会标准
全文来源： WF
中文关键词： 总线系统 总线 电路网络 通信 控制设备 控制系统 控制工艺学 数据通信 数据链层 数据连接系统 数据处理 数据设备 数据传送 定义 数字的 数字数据 数字工程 数字信号 电子数据处理 电气工程 电子仪器 电子系统 英语 现场总线 制导系统 工业的 工业设施 信息交换 信息处理 信息技术 接口 接口(数据处理) 链路层 开放系统互连 过程控制 过程控制工程 过程控制系统 协议规范 协议 信号 规范 规范(验收) 传输媒质 传输协议
英文关键词： OSI
语种： 汉语
页数： 38
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