EN 61158-5-7:2008

INTRODUCTION
1 Scope
  1.1 Overview
  1.2 Specifications
  1.3 Conformance
2 Normative references
3 Terms, definitions, symbols, abbreviations and conventions
  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
5 Data type ASE
  5.1 Overview
  5.2 Formal definition of data type objects
  5.3 FAL defined data types
6 Communication model specification
  6.1 Concepts
  6.2 ASEs
  6.3 ARs
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. 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.