BS EN 61158-6-8:2008 PDF

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