The data-link layer provides basic time-critical messaging communications between devices in an automation environment.

This protocol provides communication opportunities to all participating data-link entities
a) in a synchronously-starting cyclic manner, and
b) in a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities.

Thus this protocol can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.

Cross References:
IEC 61158-3-12:2019
IEEE Std 802.1Q
ISO/IEC 7498-1
IEC 61588
ISO/IEC 7498-3
ISO/IEC/IEEE 8802-3
IETF RFC 768
IETF RFC 791
ISO/IEC 10731
ISO/IEC 9899
IEC 61784-1
IETF RFC 1643
ISO/IEC TR 8802-1
ITU-T V.41
IEC 61158-6-12
IETF RFC 1213
IEEE Std 802.1D
IEC 61784-2
IEC 61131-2
IEC 61131-3
IEC 61158-1
ISO/IEC 15802-1
ANSI X3.66 (R1990)
BS EN IEC 61158-5-12:2019
IEC 61158-5-12:2019
IEC 61158-2:2014


Replaces BS EN 61158-4-12:2014 which remains current

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