9410 series
Time and timekeeping
Time and timekeeping
Time overview
Your meter supports different time types and time synchronization methods to adjust
its internal clock.
Your meter’s internal clock is used for keeping time, timestamping data and
determining intervals for time-based measurements. The meter’s clock does not affect
externally logged data.
Your meter monitors the passage of time using the frequency of an internal oscillator or
the frequency of the line power being measured. You can view your meter’s time and
date information using the display or through software. To improve your meter clock’s
accuracy, you can use an external time reference, such as a Global Positioning
System (GPS) signal.
Your meter’s battery maintains the internal clock when the meter is unpowered.
Your meter displays local time based on the meter’s time sync source and settings for
timezone and daylight savings time. You can configure your meter’s date and time
format.
Go to www.usa.siemens.com/pds and download the
Time synchronization and
timekeeping
technical note for more information about time formats and settings and
the
ION Reference
for a detailed description of the Clock module and its operation.
Time synchronization overview
The time synchronization source and the duration between time synchronization
messages determines the accuracy of the meter’s clock.
The clock is adjusted by synchronizing the meter’s time with another time source. Time
synchronization messages can be automatically generated and sent to your meter
from your energy management system software or other time source such as an
SNTP/NTP server or GPS receiver. You can also manually trigger a time
synchronization message from your energy management system or configuration
software.
NOTE:
To help maintain data integrity, some energy management systems impose a
blackout rule where time synchronization messages near energy interval boundaries
are ignored.
Supported time synchronization sources
Several time synchronization sources are available to your meter.
•
Meter configuration software (ION Setup): Configuration software can manually
synchronize the time of your meter based on the clock of the computer running the
configuration software. Configuration software synchronization is usually performed
when the meter is initially commissioned.
•
Energy management system: Energy management systems can synchronize the
time of your meter to be consistent with other meters on the network.
•
Simple Network Time Protocol (SNTP): SNTP can synchronize the time of your
meter up to ± 1 second of other meters on an Ethernet network. For SNTP time
synchronization, your meter must be connected to an Ethernet network that has an
active SNTP server and be configured with the server’s information.
•
GPS receiver (IRIG-B): A GPS receiver using IRIG-B can synchronize the time of a
meter up to ± 1 ms of Coordinated Universal Time (UTC). A dedicated serial
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7EN05-0336-01