Rockwell Automation 1756-HIST2G FactoryTalk Historian ME 2.2 - Manual (Page 140)

F ACTORY T ALK H ISTORIAN ME M ODULE U SER ’ S G UIDE
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Time Synchronization Settings
FactoryTalk Historian ME can periodically check external time sources to
synchronize its time settings. Synchronization is based on a single selected time
source that coordinates time accuracy among different devices in your FactoryTalk
environment. The module’s Universal Coordinated Time (UTC) may be
synchronized to a Logix5000 Controller, a network NTP time server, or a
FactoryTalk Historian SE or PI server configured as an NTP time server.
For NTP Server or FactoryTalk Historian SE/PI server time synchronization options,
the module obtains the current time for its real-time clock once per minute. The
module uses its real-time clock and periodically corrects the clock drift using its NTP
Server or Controller Time.
To synchronize time in FactoryTalk Historian ME, select one of four options:
„
Controller Time
Select the Controller Time radio button, and then select a controller from the
drop-down menu.
If you change the module time to a past time compared to the current module time,
the following message displays, “The time you have entered is in the past, This may
put the module in safe mode, which would require you to delete all data archives past
this time. Are you sure you want to continue?”
If you click [Yes] the module will enter safe mode if the time change results in 1)
archive file timestamps are newer than the module’s current time or 2) archive files
with overlapping time ranges. If the module enters safe mode, you must go to the Web
Diagnostics interface to repair the archive files and exit safe mode.
Select one of four
Time Synchronization
options