BS EN 61158-5-11-2008 工业通讯网络.数据总线规范.应用层设备定义.11型元件

标准号：BS EN 61158-5-11-2008
中文标准名称：工业通讯网络.数据总线规范.应用层设备定义.11型元件
英文标准名称：Industrial communication networks — Fieldbus specifications — Part 5-11: Application layer service definition — Type 11 elements
标准类型：M11
发布日期：2009/1/31 12:00:00
实施日期：2009/1/31 12:00:00
中国标准分类号：M11
国际标准分类号：35.100.70;35.160;35.240.50
引用标准：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
适用范围：The fieldbus Application Layer (FAL) provides user programs with a means to access theFieldbus communication environment. In this respect, the FAL can be viewed as a “windowbetween corresponding application programs.”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 thepresence of a time-window, within which one or more specified actions are required to becompleted with some defined level of certainty. Failure to complete specified actions withinthe time window risks failure of the applications requesting the actions, with attendant risk toequipment, plant and possibly human life.This part of IEC 61158 defines in an abstract way the externally visible service provided bythe different Types of fieldbus Application Layer in terms ofa) an abstract model for defining application resources (objects) capable of beingmanipulated by users 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 theytake; 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 SystemsManagement of the Fieldbus Reference Model.This part of IEC 61158 specifies the structure and services of the IEC fieldbus ApplicationLayer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSIApplication Layer Structure (ISO/IEC 9545).FAL services and protocols are provided by FAL application-entities (AE) contained within theapplication processes. The FAL AE is composed of a set of object-oriented ApplicationService Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. TheASEs provide communication services that operate on a set of related application processobject (APO) classes. One of the FAL ASEs is a management ASE that provides a commonset of services for the management of the instances of FAL classes.Although these services specify, from the perspective of applications, how request andresponses are issued and delivered, they do not include a specification of what the requestingand responding applications are to do with them. That is, the behavioral aspects of theapplications are not specified; only a definition of what requests and responses they cansend/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also definedin this standard to provide access to the FAL to control certain aspects of its operation.