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 12 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 646
IEC 61158-6
EN 61158-6
ISO/IEC 10731
ISO/IEC 8822
ISO/IEC 7498-1
ISO/IEC 8824-1
ISO/IEC 9545
IEC 61158-1:2019
EN IEC 61158-1:2019
IEC 60050 (all parts)
IEC 61784-1
EN 61784-1
IEC 61784-2
EN 61784-2


Replaces BS EN 61158-5-23:2014 which remains current

All current amendments available at time of purchase are included with the purchase of this document.