EN 61158-5-8:2008

INTRODUCTION
1 Scope
  1.1 Overview
  1.2 Specifications
  1.3 Conformance
2 Normative references
3 Terms and definitions
  3.1 ISO/IEC 7498-1 terms
  3.2 ISO/IEC 8822 terms
  3.3 ISO/IEC 9545 terms
  3.4 ISO/IEC 8824 terms
  3.5 Fieldbus data-link layer terms
  3.6 Fieldbus application layer specific definitions
  3.7 Abbreviations and symbols
  3.8 Conventions
4 Concepts
  4.1 Overview
  4.2 Architectural relationships
  4.3 Fieldbus Application Layer structure
  4.4 FAL naming and addressing
  4.5 Architecture summary
  4.6 FAL service procedures
  4.7 Notional FAL service procedures [INFORMATIVE]
  4.8 Common FAL attributes
  4.9 Common FAL service parameters
  4.10 APDU size
5 Data type ASE
  5.1 General
  5.2 Formal definition of data type objects
  5.3 FAL defined data types
  5.4 Data type ASE service specification
6 Communication model specification
  6.1 ASEs
  6.2 ARs
  6.3 Summary of FAL classes
  6.4 Permitted FAL services by AREP role
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications
Bibliography

It 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.' 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 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. It includes the following significant changes with respect to the previous edition deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance; addition of new types of fieldbuses; division of this part into multiple parts numbered.