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NTP server for PLC clock synchronization
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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.
FP Web-Server V2.810 EN
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