Siemens 6MD85 Manual page 130

System Functions
3.6 Date and Time Synchronization
Configurable Time Sources:
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2 time sources can be taken into consideration with the SIPROTEC 5 devices. For each time source, the
synchronization type may be selected based on the options provided.
•
Time source 1 takes precedence over Time source 2, that is, Time source 2 will be effective for
the synchronization of the device time only if Time source 1 fails. If only one time source is available
and it fails, then only the internal clock continues unsynchronized. The status of the time sources is indi-
cated.
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For every time source, it is possible to define via the Time zone time source 1 parameter (or Time
zone time source 2) if this source transmits its time by UTC (universal time) or if the settings corre-
spond to the local time zone of the device.
NOTE
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Make sure that the settings for the time sources coincide with the actual hardware configuration of your
SIPROTEC 5 device. In any event, incorrect settings cause the status indications of time sources to pick up.
Configurable Date Format
Regardless of a feed time-synchronization source, a uniform format is maintained internally within the device.
The following options are available for the customary local representation of the date format:
•
Day.Month.Year: 24.12.2009
•
Month/Day/Year: 12/24/2009
•
Year-Month-Day: 2009-12-24
Taking Local Time Zones into Account
The internal device time is maintained in universal time (UTC). To display time stamps in DIGSI and on the
device display, you can define the local time zone of the device (parameter Offset time zone for GMT),
including the applicable daylight saving times (start, end, and offset of daylight saving time) using parame-
ters. This allows the display of the local time.
NOTE
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For time sources that transmit the status of the switch to daylight saving time, this will be taken into
account automatically when creating the internal device time in the UTC format. The differential time
of the daylight saving time set in the device (parameter Offset daylight saving time) is taken into
consideration. However, in contrast, the settings of the start of daylight saving time and end of the
daylight saving times are ignored when converting into the device internal UTC format.
•
For active time sources, it is not possible to set the time via the device display or DIGSI 5. An exception
is setting the calendar year for active time protocol IRIG-B.
Status, Supervision, and Indications of Time Management
Your SIPROTEC 5 device generates status and monitoring indications that provide important information
regarding the correct configuration of the time source and the status of the internal time management during
start-up and device operation.
Internal time synchronization is monitored cyclically. Important synchronization processes, the status of the
time sources and errors detected are reported. A device time that has become invalid will be marked accord-
ingly so that affected functions can go to a safe state.
130 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017