Panasonic FP Web-Server2, Руководство по аппаратной части и настройке

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NTP server for PLC clock synchronization
156 FP Web-Server V2.810 EN
Additionally the FP Web-Server can be set up in this way so that a
PLC-controlled internal flag can trigger a PLC clock update.
The FP Web-Server can also save clock information in a user-definable DT
register address. This is especially useful for PLCs having no integrated
RTC.
A battery must be installed to use the RTC functions of the FP  (Sigma).
The time function is mainly designed to request the current time from an
NTP server located in the LAN to update the PLC clock. "Example -
PPP-VPN-NTP-SMS" also shows how to establish a dial-up connection to the
Internet to request the time from an Internet NTP server to update the PLC
clock.
For more information on world time and DST see:

http://www.worldtimezone.com/

http://www.twinsun.com/tz/tz-link.htm

http://www.weltzeituhr.com/

http://www.pool.ntp.org/en/
 Please be aware that an enabled NTP module takes up about 11kB of
the FP Web-Server's FLASH memory.
 The server timeout is 2 minutes, i.e. the NTP server must respond to
the time request of the FP Web-Server within 2 minutes.
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