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 part of IEC 61158 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.

Cross References:
ISO/IEC 10646
ISO/IEC 7498-1
ISO/IEC 8824-1
IEC 61784-3-2
ISO 639-2
ISO/IEC 9545
ISO/IEC/IEEE 8802-3
IEEE 802.1D-2004
ISO/IEC 10731
IEEE 802.3-2015
ISO/IEC 8825-1
IEC 61800-7-202
IEEE 802.1Q-2005
IEC 61158-1:2019
IEC 61158-3-2:2014
IEC 61588:2009
IEC 62026-3:2014
IEC 61158-4-2:2019
IEC 61158-5-2:2019
IEC 61784-2:2019
IEC 61784-1:2019
IEC 61131-3
ISO/IEC 8822
ISO/IEC/IEEE 60559


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