Time and timekeeping 9410 series
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.
Time sync source Description
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)
1
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 network
is required to implement a GPS scheme. For IRIG-
B, one of your meter’s digital inputs must be
connected to the IRIG-B network, and the digital
input must be configured for IRIG-B time
synchronization in addition to configuring your
meter’s clock.
GPS over serial A GPS receiver can synchronize the time of a
meter up to ± 1 ms of Coordinated Universal Time
(UTC). For GPS over serial, your meter’s serial
port must be connected to a GPS receiver, and the
serial port communications must be configured
with the correct protocol setting.
Network Time Protocol (NTP) NTP can typically synchronize the time of a meter
to ± 10 to 100 ms, depending on network
configuration. To implement NTP time
synchronization, your meter must be connected to
an Ethernet network that has an active NTP server
and be configured with the server’s information.
1
Use the digital inputs located on the meter base for IRIG-B time synchronization and
other high-accuracy applications.
GPS time quality flag
The meter’s GPS time quality flag is primarily used to report time quality information for
digital input events, such as status alarms, in Sequence-of-Events Recording (SER)
applications.
The meter keeps track of the time difference between the meter’s internal clock and
the GPS time sync source. When the meter’s Clock module’s Use GPS Quality Flag is
set to
USE FLAG, the Diagnostics module’s GPS Receiver Status output register is set to:
•
LOCKED if the time difference between the GPS time sync source and meter clock is
within ±1 ms of each other
7EN05-0336-03 95
To Next Page
Loading...
