BS EN 61158-5-11:2008
Industrial communication networks — Fieldbus specifications — Part 5-11: Application layer service definition — Type 11 elements

Standard No.

BS EN 61158-5-11:2008

Release Date

2009

Published By

British Standards Institution (BSI)

Latest

BS EN 61158-5-11:2008

Replace

BS EN 61158-5:2004

Scope

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 part of IEC 61158 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 11 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 part of IEC 61158 defines in an abstract way the externally visible service provided by the different Types of fieldbus Application Layer in terms of a) an abstract model for defining application resources (objects) capable of being manipulated 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 they take; and d) 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 to 1) the FAL user at the boundary between the user and the Application Layer of the Fieldbus Reference Model, and 2) Systems Management at the boundary between the Application Layer and Systems Management of the Fieldbus Reference Model. This part of IEC 61158 specifies the structure and services of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545). FAL services and protocols are provided by FAL application-entities (AE) contained within the application processes. The FAL AE is composed of a set of object-oriented Application Service Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. The ASEs provide communication services that operate on a set of related application process object (APO) classes. One of the FAL ASEs is a management ASE that provides a common set of services for the management of the instances of FAL classes. Although these services specify, from the perspective of applications, how request and responses are issued and delivered, they do not include a specification of what the requesting and responding applications are to do with them. That is, the behavioral aspects of the applications are not specified; only a definition of what requests and responses they can send/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 defined in this standard to provide access to the FAL to control certain aspects of its operation.

BS EN 61158-5-11:2008 Referenced Document

• IEC 60559 Binary floating-point arithmetic for microprocessor systems
• IEC 61131-1 Programmable controllers - Part 1: General information
• IEC 61131-3 Programmable controllers - Part 3: Programming languages*， 2013-02-01 Update
• ISO/IEC 10646-1 Information technology — Universal Multiple-Octet Coded Character Set (UCS) — Part 1: Architecture and Basic Multilingual Plane — Amendment 2: Limbu, Tai Le, Yijing and other characters
• ISO/IEC 10731 Information technology - Open Systems Interconnection - Basic Reference Model - Conventions for the definition of OSI services
• ISO/IEC 646 Information technology; ISO 7-bit coded character set for information interchange
• ISO/IEC 7498-1 Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model
• ISO/IEC 7498-3 Information technology - Open Systems Interconnection - Basic reference model: Naming and addressing
• ISO/IEC 8822 Amendment 2 - Information technology -- Open Systems Interconnection -- Presentation service definition - Nested connections functional unit
• ISO/IEC 8824 Information technology; open systems interconnection; specification of abstract syntax notation one (ASN.1)
• ISO/IEC 8859-1 Information technology - 8-bit single-byte coded graphic character sets - Part 1: Latin alphabet No. 1
• ISO/IEC 9545 Information technology - Open Systems Interconnection - Application layer structure

BS EN 61158-5-11:2008 history

• 2009 BS EN 61158-5-11:2008 Industrial communication networks — Fieldbus specifications — Part 5-11: Application layer service definition — Type 11 elements
• 2004 BS EN 61158-5:2004 Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Application layer service definition