BS EN 61158-6-8-2008 工业通信网络.现场总线规范.应用层协议规范.8型元件

标准号：BS EN 61158-6-8-2008
中文标准名称：工业通信网络.现场总线规范.应用层协议规范.8型元件
英文标准名称：Industrial communication networks - Fieldbus specifications - Part 6-8: Application layer protocol specification — Type 8 elements
标准类型：L79
发布日期：2008/6/30 12:00:00
实施日期：2008/6/30 12:00:00
中国标准分类号：L79
国际标准分类号：35.100.70;35.160;35.240.50
引用标准：ISO/IEC 7498;ISO/IEC 8822;ISO/IEC 8824;IEC 60059;IEC 61158-3-8;IEC 61158-4-8;IEC 61158-5-8;ISO/IEC 8825;ISO/IEC 9545
适用范围：This standard provides common elements for basic time-critical and non-time-criticalmessaging communications between application programs in an automation environment andmaterial specific to Type 8 fieldbus. The term “time-critical” is used to represent the presenceof 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 timewindow risks failure of the applications requesting the actions, with attendant risk toequipment, plant and possibly human life.This standard specifies interactions between remote applications and defines the externallyvisible behavior provided by the Type 8 fieldbus application layer in terms ofa) the formal abstract syntax defining the application layer protocol data units conveyedbetween communicating application entities;b) the transfer syntax defining encoding rules that are applied to the application layerprotocol data units;c) the application context state machine defining the application service behavior visiblebetween communicating application entities;d) the application relationship state machines defining the communication behavior visiblebetween communicating application entities.The purpose of this standard is to define the protocol provided to1) define the wire-representation of the service primitives defined in IEC 61158-5-8, and2) define the externally visible behavior associated with their transfer.This standard specifies the protocol of the Type 8 fieldbus application layer, in conformancewith the OSI Basic Reference Model (ISO/IEC 7498) and the OSI application layer structure(ISO/IEC 9545).The principal objective of this standard is to specify the syntax and behavior of the applicationlayer protocol that conveys the application layer services defined in IEC 61158-5-8.A secondary objective is to provide migration paths from previously-existing industrialcommunications protocols. It is this latter objective which gives rise to the diversity ofprotocols standardized in the IEC 61158-6 series.