YOKOGAWA Vnet/IP, Техническая информация

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4. Appendix
4-8
TI 30A10A05-01E
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Time synchronization with a V net domain
When a V net domain is connected to a Vnet/IP network, the time on Vnet/IP is used as the
master time, and the time of V net domains synchronizes with it. You can set the time on V net as
the master time. (*1)
The V net router compares the time of Vnet/IP domains with the time of V net domains every 2
minutes, and then synchronizes its time with the Vnet/IP domain time if a deviation of 5 seconds
or more occurs twice.
*1: If you are using V net routers of AVR10D style S2, you cannot set the time on V net as the master time.
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Operational precautions
The network time is a master clock in stations operating on a computer, such as an HIS.
Even though the system time is adjusted from the Windows Control Panel, the correct time is not
set because the time synchronization service program sets the system time to the network time.
Use the time set dialog box in the HIS system status display window to adjust the network time.
If the network time is synchronized with the SNTP server time, you cannot adjust the network
time from the HIS or SENG.
A V net router obtains time information from the domain master on its starting up as it does not
keep time information. Ensure to power on V net router only after other Vnet/IP stations are
powered on so that the V net router does not become the domain master.
In case the network time becomes incorrect due to V net router being powered on prior to other
Vnet/IP stations, adjust it to the correct time by using the time set dialog box in the HIS system
status display window.
Aug. 22, 2014-00