Siemens siprotec 7SA6 User Manual page 515

Representation of
the Time
7SA6 Manual
C53000-G1176-C133-1
The text symbols, or "status bits", for the time status have the following meanings:
16
Not synchronized
(5
Time error
67
Daylight savings
time
A healthy condition is ensured if texts No 1 and No 2 of Table 7-2 appear in the display.
Various representations of the date and time stamp may be given in the '$7(7,0(
sub-menu and in all messages stamped with the date and time. The year number and
the values of the status bits "time invalid" and "time malfunction" determine the
representations. The possible representations and the associated causes are listed in
Table 7-3.
Table 7-3 Representations of Date and Time:
Item Display (Example)
Date
HH HH HHHH
 
1
 
2
" 
3
  
4
HH HH HHHH
" 
5
(? appearing in the date and time field indicate that the clock synchronisation has been lost).
Item 1 appears if the internal clock RTC did not have a valid time upon start-up. The
messages in the memory buffers are dated 01/01/1990.
Corrective action: Set the date and time manually (see margin header "Changing the
Time" below).
Item 2 appears if the time was actually set, but not synchronized. This can happen:
− briefly upon device power-up,
− if synchronization is lost; that is, if the cyclical synchronization is interrupted for a
time longer than the set tolerance time ((UURU 7LPH).
Corrective action: If an external synchronizing source is being used, check the source
and the connection.
Item 3 is displayed if the RTC had a valid value upon device start-up but the time was
neither manually set nor synchronized since.
Corrective action: Set the date and time manually, or wait until the cyclical
synchronization takes effect.
Time was neither set manually nor synchronized after
power-up. The synchronization via the system
interface defines the transmitted time value as
"invalid", the cyclical synchronization continues
however.
At the moment, there is no cyclical synchronization
within the tolerance times (time can jump)
The latest synchronization signal received supplied a
daylight savings time bit
Year
Time
" 
Year = 1990
" 
" 
1990<Year<2090
  
" 
Control During Operation
Time Time Invalid
Malfunction
irrelevant
Yes No
Yes Yes
No No
No Yes
7-31