BS EN 61158-5-2 is part of a series produced to facilitate the interconnection of automation system components. BS EN 61158-5-2 is related to other standards in the set as defined by the “three-layer” fieldbus reference model described in IEC 61158-1.
This standard 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 2 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 61158-5-2 defines in an abstract way the externally visible service provided by the Type 2 fieldbus application layer in terms of:
BS EN 61158-5-2 on industrial communication networks is useful for:
The application service is provided by the application protocol making use of the services available from the data link or other immediately lower layer.
BS EN 61158-5-2 defines the application service characteristics that fieldbus applications and/or system management may exploit.
BS EN 61158-5-2 specifies the characteristics of conceptual application layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of application layer protocols for time-critical communications.
BS EN 61158-5-2 provides migration paths from previously-existing industrial communications protocols.
Overall, the guidance of BS EN 61158-5-2 enables you to create communication systems that increase work efficiency for your clients.
EN 61158-5-2:2014
IEC 61158-5-2:2014