Rockwell Automation FactoryTalk Historian SE 3.0 Live Data Interface User Guide - Manual (Page 51)

Chapter 9
45
Interface Node Clock
Make sure that the time and time zone settings on the computer are correct.
Check the settings in the Date and Time program of Control Panel. If the
locale where the interface node resides observes Daylight Saving Time,
check Automatically adjust clock for Daylight Saving Time in Time
Zone Settings.
Make sure that the TZ environment variable is not defined on the
computer. To check it, type set in the Command Prompt window. All the
environment variables currently defined in Windows will be listed. If the
TZ environment variable is defined, remove it using the System program
of Control Panel.
It is possible for computer nodes to boot up with different clock times before
synchronizing to the time server. If synchronization is left to the Microsoft defaults,
it can take several minutes for the system to synchronize all node clocks in the
network. To minimize clock synchronization time, you can modify the registry on
the computer nodes in the FactoryTalk Historian SE system to adjust local clocks to
the time server. To do this, set the MaxAllowedPhaseOffset entry to 1 on every
node in the FactoryTalk Historian SE system. The entry resides in the following
subkey:
My Computer\HKEY-
_LOCAL_MACHINE\System\ControlSet001\services\W32Time\Config .
We recommend that only advanced users modify the registry. Refer to the
system documentation for more information on the Windows registry.