DIN EN 61158-3-16-2008 工业通信网络.现场总线规范.第3-16部分:数据链层服务定义.16型元件

标准号：DIN EN 61158-3-16-2008
中文标准名称：工业通信网络.现场总线规范.第3-16部分:数据链层服务定义.16型元件
英文标准名称：Industrial communication networks - Fieldbus specifications - Part 3-16: Data-link layer service definition - Type 16 elements (IEC 61158-3-16:2007); English version EN 61158-3-16:2008, only on CD-ROM
标准类型：N18;P76
发布日期：1999/12/31 12:00:00
实施日期：2008/9/1 12:00:00
中国标准分类号：N18;P76
国际标准分类号：35.100.20;35.160;35.240.50
引用标准：ISO/IEC 7498-1;ISO/IEC 7498-3;ISO/IEC 10731
适用范围：1.1 OverviewThis standard provides common elements for basic time-critical messaging communicationsbetween devices in an automation environment. The term “time-critical” is used to represent thepresence of a time-window, within which one or more specified actions are required to be completedwith some defined level of certainty. Failure to complete specified actions within the time windowrisks failure of the applications requesting the actions, with attendant risk to equipment, plant andpossibly human life.This standard defines in an abstract way the externally visible service provided by the Type 16fieldbus data-link layer in terms ofa) the primitive actions and events of the service;b) the parameters associated with each primitive action and event, and the form which they take;andc) the interrelationship between these actions and events, and their valid sequences.The purpose of this standard is to define the services provided to• the Type 16 fieldbus application layer at the boundary between the application and data-linklayers of the fieldbus reference model, and• systems management at the boundary between the data-link layer and systems management ofthe fieldbus reference model.1.2 SpecificationsThe principal objective of this standard is to specify the characteristics of conceptual data-link layerservices suitable for time-critical communications, and thus supplement the OSI Basic ReferenceModel in guiding the development of data-link protocols for time-critical communications. Asecondary objective is to provide migration paths from previously-existing industrialcommunications protocols.This specification may be used as the basis for formal DL-Programming-Interfaces. Nevertheless, itis not a formal programming interface, and any such interface will need to address implementationissues not covered by this specification, includinga) the sizes and octet ordering of various multi-octet service parameters, andb) the correlation of paired request and confirm, or indication and response, primitives.1.3 ConformanceThis standard does not specify individual implementations or products, nor do they constrain theimplementations of data-link entities within industrial automation systems.There is no conformance of equipment to this data-link layer service definition standard. Instead,conformance is achieved through implementation of the corresponding data-link protocol that fulfillsthe Type 16 data-link layer services defined in this standard.