Control Of Device Functions - Siemens siprotec 7SA522 User Manual

Control During Operation
7.2

Control of Device Functions

7.2.1 Read and Set Date and Time
Time Status
Representation of
the Time
7-22
You may change individual functions and messages in a 7SA522 while the device is
in-service. Some examples are given above, including erasing stored information
(Sub-section 7.1.1.4) and setting/resetting counters and set-points (Sub-sections
7.1.2.2 and 7.1.3.3). In this section, three other control capabilities are discussed.
They are correcting the date and time, changing the settings group, and affecting in-
formation at the system interface during test operations.
The 7SA522 device can be connected to an external clock source, binary input or use
the internal RTC for time and date stamping.
Besides the display of date and time, the status of these readings is also provided. The
text of the status display can have the appearances given in Table 7-2, under regular
conditions of time control.
Table 7-2 Time Status
Status Text No.
   
1
   67
2
  (5 
3
  (5 67
4
 16 (5 
5
 16  
6
The text symbols, or "status bits", for the time status have the following meanings:
16
Not synchronized
(5
Time error
67
Daylight savings
time
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 repre-
synchronized
not synchronized
Time was neither set manually nor synchronized after
power-up.
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
7SA522 Manual
C53000-G1176-C119-2