What is BS EN 61158-4-16 - Data-link layer protocol specification about?
BS EN 61158 is a European standard that discusses the Fieldbus specifications for industrial communication networks. BS EN 61158-4-16 provides a data-link layer that outlines time-critical messaging communications between devices in an automation environment.
This protocol provides communication opportunities to all participating data-link entities:
In a synchronously starting cyclic manner, according to a pre-established schedule
In a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities.
The protocol described in BS EN 61158-4-16 can be characterised as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle.
BS EN 61158-4-16 outlines:
Procedures for the timely transfer of data and control information from one data-link user entity...