BS EN 61158-6-8:2008

What is BS EN 61158-6-8 - Fieldbus application layer protocol specification about?

BS EN 61158 is a European standard on industrial communication networks that discuss Fieldbus specifications.

BS EN 61158-6-8 outlines the 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.

BS EN 61158-6-8 layouts interactions between remote applications and defines the externally visible behaviour provided by the Type 8 Fieldbus application layer in terms of:

• The formal abstract syntax defining the application layer protocol data units conveyed between communicating application entities
• The transfer syntax defining encoding rules that are applied to the application layer protocol data units
• The application context state machine defines the application service behaviour visible between communicating application entities
• The application relationship state machines define the communication behaviour visible between communicating application entities

The purpose of BS EN 61158-6-8 is to define the protocol provided to:

• Define the wire representation of the service primitives defined in IEC 61158-5-8
• Define the externally visible behaviour associated with their transfer

BS EN 61158-6-8 also specifies the protocol 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).

Who is BS EN 61158-6-8 - Fieldbus application layer protocol specification for?

BS EN 61158-6-8 on Fieldbus application layer protocol specification is useful for:

• Developers of Fieldbus application layer protocols
• Implementors and designers
• Test centres
• Institutions and organisations working on Fieldbus application layer protocols
• Regulatory authorities

Why should you use BS EN 61158-6-8 - Fieldbus application layer protocol specification?

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".

BS EN 61158-6-8 assists you with the Fieldbus application layer (FAL) syntax description, Transfer syntax and Protocol machine overview for designing Fieldbus systems.

BS EN 61158-6-8 also guides regarding the Fieldbus application layer (FAL) service protocol machine (FSPM), Application relationship protocol machines (ARPMs), and DLL mapping protocol machine to optimise messaging communications between application programs in an automation environment and material specific to Type 8 Fieldbus.

With obedience and compliance to BS EN 61158-6-8, you can standardize the type 8 Fieldbus application layer protocols for industrial communication networks. In addition, provides a set of rules for communication expressed in terms of the procedures to be carried out by peer application entities (AEs) at the time of communication.

What’s changed since the last update?

BS EN 61158-6-8:2008 supersedes EN 61158-6:2004, which has been withdrawn. BS EN 61158-6-8:2008 has some technical changes with respect to EN 61158-6:2004. These include:

• Deletion of Type 6 Fieldbus for lack of market relevance
• Addition of new Fieldbus types
• Partition into multiple parts numbered 6-2, 6-3, …6-20