1184   t applies to q

This tissue has following status: blue

Created: 30 Oct 2013

Links:

Page: 75

Clause: 8

Paragraph: t

Category: No impact on this part

Issue: The semantic for t is: "Timestamp of the last change in one of the attribute(s) representing the value of the data or in the q attribute. For the different CDCs, t applies to the following data attributes:"

The table shows various CDC attributes to which t applies, but in no case does the table indicate a q to which t applies. Whether the table is an inclusive list or an exclusive list, and thus whether t applies to q or not, is left to the individual server and client developers to determine. A client should not be left to guess on receiving stVal, q and t whether t applies to stVal or to q.

Proposal: Remove the words: "or in the q attribute".

Discussion Created Status
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Ballot until Editor
It is intended that t changes both with the value as well as with q. As stated that can not be changed since it would be a backwards compatibility issue.

And with the Autogenerated Version of IEC 61850-7-3 in the future, this is as well explicitly stated.

So no Change is needed.
05 Dec 13 blue
I agree with Christoph, the intention was, that t changes as well when q changes.

Either add q in the table or enhance the text as follow:

For the different CDCs, t applies ADDITIONALLY to the following data attributes:

That would be a MAJOR interop issue removing q from the definition. q change always (ed1 included) led to changing t.
05 Dec 13 red
In my opinion, the intention was, that t changes as well when q changes. So it might be required to include it in the tables. 20 Nov 13 red

 

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