Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 204)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER ’ S G UIDE
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Module's Current Time - the current date and time of the module.
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RTC Time - the current time of the Real Time Clock (RTC).
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Last Update Time - the date and time of when the module time was last updated.
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Controller Path - the path to the Controller system from an external time source.
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Update Rate - how often the time is updated from an external time source.
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NTP Server - (appears only if the time source is an NTP server) the IP address of
the NTP server from an external time source.
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NTP Logs - if your module is synched to an NTP, Historian SE, or PI server, NTP
log files will display in this section.
If the time synchronization with an NTP server (including a FactoryTalk Historian SE
or PI server) is not successful, you may see the following error messages on this
page:
sendto("IP") (fd=-1): Bad file descriptor (fd=-1) ("IP" is the NTP
server's IP address.)
frequency error xxx PPM exceeds tolerance 500 PPM ( "xxx" is the PPM
value that is larger than 500.)
No reply; clock not set. (The time was not synchronized successfully.)
When any of these error messages are logged, check to make sure that the NTP server
is running properly, and then reboot the ME module to synchronize with the NTP
server again.