1414   Adapt enumeration values 0 for "Not applicable/Unknown" to 98

Created: 15 Jun 2015

Status: Triage

Part: Part 7-420 (2008; DER)

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Page: many

Clause: many

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Category: Issue for edition 2 of this part

Issue

In IEC 61850-7-4 and IEC 61850-7-4xx standards it is unusual that enumerations start with value zero. They start with 1 instead.
However in IEC 61850-7-420 almost all enumerations start with 0 and use this value for enumeration item "Not applicable/Unknown" or "Unknown".
To reach consistency with IEC 61850-7-4 Ed. 2.1, in which the value 98 was used for enumeration item "Not applicable/Unknown" (see enumerations MaterialKind or MaterialStateKind) it was decided to use the same convention for enumerations of IEC 61850-7-420.

Proposal

Change the value for enumeration items "Not applicable/Unknown" or "Unknown" from 0 to 98 and reorder the enumeration items accordingly. Affects almost all enumerations defined in IEC 61850-7-420.
[Decided by WG 17 IEC 61850-7-420 UML task force phone conference at 2015-06-09.]

Discussion Created Status
There was a single enumeration in IEC 61850-7-420 using more than 97 enumeration items (or having items values greater than 97). For this enumeration IndependentRefParamUnitsKind the value 998 was selected for item "Not applicable/Unknown".
The above mentioned decision will remain in effect for all other enumerations in question.
15 Jun 15 Triage
Changing from 98 to 0 would make more sense, since some enums can have more than 100 entries. 15 Jun 15 Triage

 

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