527   LogEna default value and storage

This tissue has following status: green

Created: 24 Apr 2007

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Page: 57

Clause: 17.3.3.2.1

Paragraph:

Category: Issue for edition 2 of this part

Issue: "The default value of the LogEna is a local issue. However it is suggested that the default value should be FALSE".

The clause 9.3.9, page 61/63 of the IEC 61850-6(2004)/57-798-CD(ed.2).
specifies that LogEna is TRUE by default.

"The value of LogEna shall be non-volatile".

IEC 61850-7-2 specifies that the LG attributes shall be non volatil.

Proposal: We propose changing the sentence: "The default value of the LogEna is a local issue. However it is suggested that the default value should be FALSE"." to...

"The default value of the LogEna shall be as defined in the configuration file."

We consider that the application layer, and not the mappings, shall specify which attributes shall be non-volatil.

We propose removing the sentence "The value of LogEna shall be non-volatile" or changing it to "As defined in IEC 61850-7-2, the value of LogEna shall be non-volatil".

Discussion Created Status
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Ballot until Editor
Changed to green. 26 Mar 08 green
(Re-)configuration of an IED may happen several times during its life time. In each case the logEna value shall be set as configured, regardless if configuration is done via SCL or elsewhere. This value (or any online change made afterwards) is then persistently kept (as stated in 7-2). From this point of view the 'first' startup, where a default value might be needed, is better called 'manufacturer supplied default value before project specific configuration'. For this case the current statement should be sufficient. It makes aware that a project specific configuration change might be needed. 18 May 07 final proposal
I agree that the "first" start-up needs to come from some sort of local configuration. However, this begs the question of how does an IED know that it is the first start-up.

I believe that the appropriate work-flow is a IED is installed, powered-up, and then configured (either via SCL, local means, other tooling). At this point, my argument is that this is the completion of the first power-up. Therefore, the state after configuration needs to be non-volatile (note not power-up).

Thus, I don't think a requirement of "first" power-up from a configuration file is appropriate.

However, the discussion does point out the ICD file provided by the manufacturer should have the LogEna=FALSE.
17 May 07 final proposal
From my point of view, in the first start-up the initial value of LogEna should be read from the configuration file. From that moment in advance the stored (non-volatil) value of LogEna shall be used instead of the value of the CID.

As in the tissue 535, we consider that IEC 61850-7-2 and not 8-1 should define that LogEna shall be non volatil.
17 May 07 final proposal
The purpose of the non-volatile statement is so to make sure logging continues in its last known state after sequencing of power.

Returning to the default, or configured value, is not desirable in this case.

15 May 07 final proposal 15-06-2007

 

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