Full Description

The Fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be considered a window between corresponding application programs.

This part of IEC 61158 provides the common elements for basic time-critical and non-timecriticalmessaging communications between application programs in an automation environment as well as material specific to the Type 21 protocol. 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 7498-3
ISO/IEC 10731
ISO/IEC 8822
IEC 61158-6-21:2019
ISO/IEC 8824
ISO/IEC 7498-1
ISO/IEC 9545
ISO/IEC 8824 (all parts)
IEC 61158-4-21:2019
BS EN IEC 61158-3-21:2019
IEC 61158-3-21:2019
ISO/IEC/IEEE 60559:2011
IEC 61158-2
ISO/IEC/IEEE 8802-3
IEC 61158-1:2019


Replaces BS EN 61158-5-21:2012 which remains current

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

Product Details

Published: 07/03/2019 ISBN(s): 9780539048421 Number of Pages: 86 File Size: 1 file , 1.7 MB Product Code(s): 30395535, 30395535, 30395535 Note: This product is unavailable in United Kingdom