IEC 61158-4-22
Industrial communication networks – Fieldbus specifications – Part 4-22: Data-link layer protocol specification – Type 22 elements
Organization: | IEC |
Publication Date: | 1 August 2014 |
Status: | active |
Page Count: | 142 |
ICS Code (Networking): | 35.110 |
ICS Code (Data link layer): | 35.100.20 |
ICS Code (Industrial process measurement and control): | 25.040.40 |
scope:
General
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-starti
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.