Rockwell Automation 1756-HIST2G Historian ME 2.1 - Manual (Page 138)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER ’ S G UIDE
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Due to the potential drift of the real-time clock over time, the Manual Set option
should only be used in rare cases such as demonstrations or troubleshooting
associated with maintenance. The FactoryTalk Historian ME will not synchronize
with any time source if you set the time using Manual Set.
When setting time manually in the Time Management page, if the new time
entered is in the past compared to the current system time, a confirmation dialog
will display informing the user that setting the time to the past may potentially put
the system into safe mode. If the system goes into safe mode, perform the steps in
the “Repairing Archives” section.
Click [Save] after you select a time synchronization option for the module to reboot
and for your time synchronization changes to take effect.
Verifying Time Synchronization
To verify time synchronization, go to the FactoryTalk Historian ME Web Diagnostics
interface by opening http://<Module IP_address>:8080 in a browser window. Click
Hardware
in the top navigation bar, and then click Time Management in the left
navigation bar. The Time Management diagnostic page displays.