BS EN 61158-6-7:2008

What is BS EN 61158-6-7 - Type 7 application layer protocol specification about?

BS EN 61158-6-7 is part of a series produced to facilitate the interconnection of automation system components. BS EN 61158-6-15 is related to other standards in the set as defined by the “three-layer” fieldbus reference model described in IEC/TR 61158-1.

BS EN 61158-6-7 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 7 fieldbus.

BS EN 61158-6-7 specifies interactions between remote applications and defines the externally visible behaviour provided by the Type 7 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 defining the application service behaviour visible between communicating application entities
• The application relationship state machines defining the communication behaviour visible between communicating application entities

Who is BS EN 61158-6-7 - Type 7 application layer protocol specification for?

BS EN 61158-6-7 on industrial communication networks is useful for:

• The IT industry / Software programmers 
• The automation industry
• Networking sectors
• Implementors and designers of industrial automation systems

Why should you use BS EN 61158-6-7 - Type 7 application layer protocol specification?

The application protocol provides the application service by making use of the services available from the data link or other immediately lower layer.

BS EN 61158-6-7 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.

BS EN 61158-6-7 specifies the syntax and behaviour of the application layer protocol that conveys the application layer services defined in IEC 61158-5-7.

BS EN 61158-6-7 provides migration paths from previously-existing industrial communications protocols.

Overall, by using BS EN 61158-6-7 together with other standards positioned within the OSI or fieldbus reference models, otherwise incompatible systems can work together in any combination.

What’s changed since the last update?

BS EN 61158-6-7:2008 and the other parts of the EN 61158-6 series supersede EN 61158-6:2004.

With respect to EN 61158-6:2004 the following changes were made in BS EN 61158-6-7:2008:

• 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