1.1 GeneralThe 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 entitiesa) in a synchronously-starting cyclic manner, according to a pre-established schedule, andb) 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.