IEC 61158-6-20:2010
工业通信网络.现场总线规范.第6-20部分:应用层协议规范.20型元件

Industrial communication networks - Fieldbus specifications - Part 6-20: Application layer protocol specification - Type 20 elements

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标准号

IEC 61158-6-20:2010

发布

2010年

中文版

GB/T 29910.4-2013 (等同采用的中文版本)

发布单位

国际电工委员会

替代标准

IEC 61158-6-20:2014

当前最新

IEC 61158-6-20:2014

 

 

适用范围

The Fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a “window between corresponding application programs.” This standard provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 20 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 behavior provided by the Type 20 of the fieldbus Application Layer in terms of a) the abstract syntax defining the application layer protocol data units conveyed between communicating application entities, b) the transfer syntax defining the application layer protocol data units conveyed between communicating application entities, c) the application context state machine defining the application service behavior visible between communicating application entities; and d) the application relationship state machines defining the communication behavior visible between communicating application entities; and. The purpose of this standard is to define the protocol provided to define a) the wire-representation of the service primitives defined in IEC 61158-5-20, and b) the externally visible behavior associated with their transfer. This standard specifies the protocol of the Type 20 IEC fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545).

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