"NOTE 1 The TimeStamp type is used for common data classes in IEC 61850-7-3 and definition of compatible data object classes in IEC 61850-7-4. The EntryTime type may or may not be the same as TimeStamp in a SCSM."
First sentence is wrong since EntryTime is not used for time-stamping. This note refers to TimeStamp.
Second sentence is wrong since EntryTime and TimeStamp always have different values.
Proposal
Remove Note 1 or change by:
NOTE 1: EntryTime is used for backward compatibility with log entries in MMS reports (e.g. 17.2.3.2.2.1 and 17.3.3).
Discussion
Created
Status
24 May 13
In Force (green)
12 Apr 13
Ballot Period
Agreed that the note statement and the definition of an epoch in 7-2 are inconsistent. As 7-2 shall be a common base for different mappings, and some (but not all) mappings might need another time base for internal services than TimeStamp, the definition of the epoch for EntryTime shall be removed - and the not shall stay as is.
08 Apr 13
Discussion (red)
1) First sentence is correct since it applies to the type TimeStamp and and not to the type entryTime
2) Second sentence is wrong since the epoch for the type EntryTime is January, 1st 1984 whereas the epoch for the type TimeStamp is January, 1st 1970.
The note could be removed since it doesn't contain any useful information, and have NO interoperability issue.
The epoch definition is clear enough for mapping in SCSM.