Siemens 9810 Series User Manual

Time and timekeeping 9810 series - User manual
241 7EN05-0390-08
Setting option Description
Line Frequency
The meter monitors the ISO Grid Operation line frequency, and
adjusts the one second period based on the measured line
frequency. All devices connected to the grid network are
synchronized to maintain a consistent time base. If a power
outage occurs, the clock automatically synchronizes with the
meter’s internal crystal until power is restored. Once power is
restored, the clock resynchronizes with the line frequency.
NOTE: Do not use line frequency when your meter is
synchronized to an external time sync source.
Internal The meter clock is synchronized to the meter’s internal crystal.
Comm
The meter clock is synchronized to an external time sync source.
Use this for the Clock Source if:
•
The Time Sync Source setup register is set to a serial
communications port to receive GPS time synchronization
signals.
•
The Time Sync Source setup register is set to ETHERNET-PTP
and your meter is installed in a trusted PTP network.
•
The Time Sync Source setup register is set to IRIG-B.
Clock source time quality flag
The meter’s clock source 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 time sync
source.
When the meter’s Clock module’s Use Clock Source Qual Flag is set to use flag, the Diagnostics
module’s Receiver Status output register is set to:
•
LOCKED if the time difference between the GPS time sync source or PTP leader and meter
clock is within ±1 ms of each other
•
UNLOCKED if the time difference between the GPS time sync source or PTP leader and meter
clock is greater than ±1 ms of each other
PTP system setting recommendations
By default, your meter is configured to be compatible in typical PTP supported systems.
In a PTP system, the grandmaster clock determines the reference time for the entire system. To
ensure correct implementation and operation of the protocol, it is recommended to set the
following parameters in your system grandmaster clock:

Siemens 9810 Series Specifications

General

Brand	Siemens
Model	9810 Series
Category	Measuring Instruments
Language	English