YOKOGAWA Vnet/IP, Техническая информация

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4. Appendix
4-5
TI 30A10A05-01E
n
Time synchronization within a Vnet/IP domain
The time is synchronized in each Vnet/IP station within a domain so that the clock time is set to its
own domain master station clock.
The domain master station manages the setting of information within a domain. It broadcasts its
own network time and periodically performs clock time multicasting to the Vnet/IP stations. It is
not necessary for you to identify the domain master station. It is selected automatically from the
Vnet/IP stations within the domain.
Vnet/IP stations that receive time synchronization broadcasting communications from the domain
master station synchronize the time by comparing their own network time to the time broadcasted
from the domain master station.
The time synchronization accuracy of the network time within a domain is expressed as follows:
± 1 msec (When one bus is abnormal, the accuracy may become worse than ± 1 msec)
Time
synchronization
services
system time
network time
system time
network time
network time
L2SW
Direction of time synchronization
Note: Bus 2 is omitted in the figure
system time
system time
network time
F040301E.ai
HIS (domain master)
FCS, SCS
HIS HIS
Figure Time Synchronization within a Vnet/IP Domain
Aug.19,2011-00