標準號：DIN EN 61158-5-11-2008
中文標準名稱：工業通信網絡.現場總線規范.第5-11部分:應用層服務定義.11型元件
英文標準名稱：Industrial communication networks - Fieldbus specifications - Part 5-11: Application layer service definition - Type 11 elements (IEC 61158-5-11:2007); English version EN 61158-5-11:2008, only on CD-ROM
標準類型：N18;P76
發布日期：1999/12/31 12:00:00
實施日期：2008/9/1 12:00:00
中國標準分類號：N18;P76
國際標準分類號：35.100.70;35.160;35.240.50
引用標準：IEC 60559;IEC 61131-1;IEC 61131-3;IEC/TR 61158-1;IEC 61158-3-11;ISO/IEC 646;ISO/IEC 7498-1;ISO/IEC 7498-3;ISO/IEC 8822;ISO/IEC 8824;ISO/IEC 8859-1;ISO/IEC 9545;ISO/IEC 10646-1;ISO/IEC 10731
適用范圍：This part of IEC 61158 provides common elements for basic time-critical and non-time-criticalmessaging communications between application programs in an automation environment andmaterial specific to Type 11 fieldbus. The term “time-critical” is used to represent the presence of atime-window, within which one or more specified actions are required to be completed with somedefined level of certainty. Failure to complete specified actions within the time window risks failure ofthe applications requesting the actions, with attendant risk to equipment, plant and possibly humanlife.This part of IEC 61158 defines in an abstract way the externally visible service provided by thedifferent Types of fieldbus Application Layer in terms ofa) an abstract model for defining application resources (objects) capable of being manipulated byusers via the use of the FAL service,b) the primitive actions and events of the service;c) the parameters associated with each primitive action and event, and the form which they take;andd) the interrelationship between these actions and events, and their valid sequences.The purpose of this part of IEC 61158 is to define the services provided to1) the FAL user at the boundary between the user and the Application Layer of the FieldbusReference Model, and2) Systems Management at the boundary between the Application Layer and Systems Managementof the Fieldbus Reference Model.This part of IEC 61158 specifies the structure and services of the IEC fieldbus Application Layer, inconformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application LayerStructure (ISO/IEC 9545).1.2 SpecificationsThe principal objective of this part of IEC 61158 is to specify the characteristics of conceptualapplication layer services suitable for time-critical communications, and thus supplement the OSIBasic Reference Model in guiding the development of application layer protocols for time-criticalcommunications.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 servicesstandardized as the various Types of IEC 61158, and the corresponding protocols standardized inIEC 61158-6.This specification may be used as the basis for formal Application Programming-Interfaces.Nevertheless, it is not a formal programming interface, and any such interface will need to addressimplementation issues 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.