DIN EN 61158-6-4-2008 工业通信网络.现场总线规范.第6-4部分:应用层协议规范.4型元件

标准号：DIN EN 61158-6-4-2008
中文标准名称：工业通信网络.现场总线规范.第6-4部分:应用层协议规范.4型元件
英文标准名称：Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements (IEC 61158-6-4:2007); English version EN 61158-6-4:2008, 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：35.100.70;35.160
引用标准：IEC 61158-3-4;IEC 61158-4-4;IEC 61158-5-4;ISO/IEC 10731;ISO/IEC 7498-1;ISO/IEC 8822;ISO/IEC 8824;ISO/IEC 9545
适用范围：This standard provides common elements for basic time-critical and non-time-critical messagingcommunications between application programs in an automation environment and material specificto Type 4 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 ofcertainty. Failure to complete specified actions within the time window risks failure of theapplications requesting the actions, with attendant risk to equipment, plant and possibly human life.This standard specifies interactions between remote applications and defines the externally visiblebehavior provided by the Type 4 fieldbus application layer in terms ofa) the formal abstract syntax defining the application layer protocol data units conveyed betweencommunicating application entities;b) the transfer syntax defining encoding rules that are applied to the application layer protocol dataunits;c) the application context state machine defining the application service behavior visible betweencommunicating application entities;d) the application relationship state machines defining the communication behavior visible betweencommunicating 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 61158-5-4, and2) define the externally visible behavior associated with their transfer.This standard specifies the protocol of the Type 4 fieldbus application layer, in conformance with theOSI 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 application layerprotocol that conveys the application layer services defined in IEC 61158-5-4.A secondary objective is to provide migration paths from previously-existing industrialcommunications protocols. It is this latter objective which gives rise to the diversity of protocolsstandardized in IEC 61158-6.