IEC 61158-3-18-2007
工业通讯网络.数据总线规范.第3-18部分:数据联络层设备定义.18型元件

Industrial communication networks - Fieldbus specifications - Part 3-18: Data-link layer service definition - Type 18 elements

标准号

IEC 61158-3-18-2007

发布日期

2007年12月

实施日期

废止日期

无

中国标准分类号

N18;P76

国际标准分类号

25.040.40;35.100.20;35.160

发布单位

国际电工委员会

被代替标准

IEC 65C/473/FDIS-2007 IEC 61158-3-2003

适用范围

1.1 Overview This standard provides common elements for basic time-critical and non-time-critical messaging communications between devices in an automation environment and material specific to Type 18 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This standard defines in an abstract way the externally visible service provided by the Type 18 fieldbus data-link layer in terms of a) the primitive actions and events of the service; b) the parameters associated with each primitive action and event, and the form which they take; and c) the interrelationship between these actions and events, and their valid sequences. This standard defines the services provided to • the Type 18 fieldbus application layer at the boundary between the application and datalink layers of the fieldbus reference model, and • system management at the boundary between the data-link layer and systems management of the fieldbus reference model. 1.2 Specifications The principal objective of this standard is to specify the characteristics of conceptual data-link layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of data-link protocols for time-critical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols. This specification may be used as the basis for formal DL-Programming-Interfaces. Nevertheless, it is not a formal programming interface, and any such interface will need to address implementation issues not covered by this specification, including: a) the sizes and octet ordering of various multi-octet service parameters, and b) the correlation of paired request and confirm, or indication and response, primitives. 1.3 Conformance This standard does not specify individual implementations or products, nor do they constrain the implementations 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 fulfills the Type 18 data-link layer services defined in this standard.

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