BS EN 61158-5-8:2008
Industrial communication networks - Fieldbus specifications - Application layer service definition - Type 8 elements

Standard No.

BS EN 61158-5-8:2008

Release Date

2008

Published By

British Standards Institution (BSI)

Latest

BS EN 61158-5-8:2008

Replace

BS EN 61158-5:2004

Scope

This standard 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 8 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 standard defines in an abstract way the externally visible service provided by the Type 8 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 standard 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 standard specifies the structure and services of the Type 8 fieldbus application layer, in conformance with 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 characteristics of conceptual application layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of application layer protocols for timecritical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols. It is this latter objective which gives rise to the diversity of services standardized as the various Types of IEC 61158, and the corresponding protocols standardized in subparts of IEC 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 address implementation issues not covered by this specification, including a) the sizes and octet ordering of various multi-octet service parameters, and b) the correlation of paired request and confirm, or indication and response, primitives.

BS EN 61158-5-8:2008 Referenced Document

• IEC 60559 Binary floating-point arithmetic for microprocessor systems
• 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 9545 Information technology - Open Systems Interconnection - Application layer structure

BS EN 61158-5-8:2008 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