Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 17 elements
Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 17 elements
What is BS EN 61158-6-17 - Application layer protocol specification - Type 17 elements about?
BS EN 61158-6-17 is part of the BS EN IEC 61158 series that has been created to facilitate the interconnection of automation system components. 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 61158-6-17 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 17 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 61158-6-17 defines in an abstract way the externally visible behaviour provided by the Type 17 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 servi...
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