Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 139)

8 • A DMINISTERING THE M ODULE
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Check the NTP Server field to ensure that your NTP server is properly set. Note the
“time reset” and “synchronize to” messages, which indicate successful
synchronization.
If the time synchronization with an NTP server (including a FactoryTalk Historian SE
server) is not successful, you may see the following error messages in the NTP Logs
section.When any of these error messages are logged, check to make sure that the
NTP server is running properly, and then reboot the module to synchronize with the
NTP server again.
NTP Log Message Message Information
sendto(“'IP”) (fd=-1): bad file
descriptor (fd=-1)
Where IP is the IP address of the NTP
Server.
frequency error xxx PPM exceeds
tolerance 500 PPM
Where xxx is the PPM value that is larger
than 500.
Verify your NTP
server is listed
Note “time reset” and
“synchronized to”
messages