Clock Source Time Quality Flag; Ptp System Setting Recommendations - Siemens 9810 Series User Manual

Clock source time quality flag

PTP system setting recommendations

Star network topology
176
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
installed in a trusted PTP network.
• The Time Sync Source setup register is set to
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
the Diagnostics module's Receiver Status output register is set to:
• if the time difference between the GPS time sync source or PTP
LOCKED
master and meter clock is within ±1 ms of each other
• if the time difference between the GPS time sync source or PTP
UNLOCKED
master and meter clock is greater than ±1 ms of each other
Your meter has been configured by default 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:
Parameter
PTP device type
Peer delay mechanism
Clock domain
Ethernet switches
In addition to PTP system related settings, the accuracy of your meter clock also
depends on your physical network configuration. A star network topology is
required to achieve the level of clock precision specified.
ETHERNET
IRIG
Setting
End to End transparent clock
2 step
0-3
PTP compatible
Time and timekeeping
- and your meter is
PTP
- .
B
USE FLAG
Description
A transparent clock that
supports the use of the end-to-
end delay measurement
mechanism between slave
clocks and the master clock.
A clock that provides time
information using the
combination of an event
message and a subsequent
general message.
A logical grouping of clocks
that synchronize to each other
using the protocol, but that are
not necessarily synchronized
to clocks in another domain
All switches and other devices
in the network must support
IEEE 1588 PTP to achieve the
stated time precision and
accuracy
7EN05-0390-00
,