772   Deterministic HSR

This tissue has following status: green

Created: 31 Dec 2017

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Clause: 5.3.7

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Category: Issue for edition 2 of this part

Issue: A transmission of sampled values at a rate of 4800 Hz with a large number of nodes challenges a 100 Mbit/s HSR ring since only a contiguous transmission of sampled values can ensure that non-critical traffic still can take place in the remaining bandwidth.
A method to organize traffic deterministically was described in IEC 61439 Ed.1 but not specified, so it was retired from subsequent editions.
It is still mentioned in the informative Clause 5.3.7 in IEC 62439-3 Ed- 3. Interest renewed again as the process bus gained acceptance in substations.

Proposal: An (optional) method to organize time-critical, periodic traffic to guarantee a deterministic delivery time is proposed. It bases on IEC 62439-3 Ed. 1 and on a paper published in PacWorld in March 2017.

 

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