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.”
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 19 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.dition 3.0 2014-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial communication networks – Fieldbus specifications – Part 6-19: Application layer protocol specification – Type 19 elements Réseaux de communication industriels – Spécifications des bus de terrain – Partie 6-19: Spécification du protocole de la couche application – Eléments de type 19 IEC 61158-6-19:2014-08(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyr