Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 20 elements
Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 20 elements
What is BS EN 61158-6-20 – Type 20 application layer protocol specification about? BS EN 61158-6-20 is one of a series produced to facilitate the interconnection of automation system components. BS EN 61158-6-20 is related to other standards in the set as defined by the “three-layer” fieldbus reference model described in IEC 61158-1 . BS EN 61158-6-20 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 20 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 61158-6-20 defines in an abstract way the externally visible behaviour provided by type 20 of the fieldbus application layer in terms of:
The abstract syntax defining the application layer protocol data units conveyed between communicating application entities The transfer syntax defining the application layer protocol data units conveyed between communicating application entities The application context state machine defining the application service beha...
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