BS EN 61158-4-11:2014 PDF

What is BS EN 61158-4-11 - Fieldbus specifications - Data-link layer protocol specification about?

The data-link layer provides basic time-critical messaging communications between devices in an automation environment. BS EN 61158-4-11 provides communication opportunities to all participating data-link entities:

In a synchronously starting cyclic manner, according to a pre-established schedule, and In a cyclic or acyclic asynchronous manner, as requested each cycle by each of those data-link entities

BS EN 61158-4-11 can be characterized as one which provides cyclic and acyclic access asynchronously but with a synchronous restart of each cycle. BS EN 61158-4-11 specifies:

Procedures for the timely transfer of data and control information from one data-link user entity to a peer user entity, and among the data-link entities forming the distributed datalink service provider Procedures for giving communications opportunities to all participating DL-entities, sequentially and in a cyclic manner for deterministic and synchronized transfer at cyclic intervals Procedures for giving communication opportunities available for time-critical data transmission together with non-time-critical data transmission without prejudice to the time-critical data transmission Procedures for giving cyclic and acyclic c...