Unified Controller Vm series Controller typeS / typeL Virtualization Functional Manual
B.1.2 When the host system clock is changed
When the system clock ((2) in the figure) of the PLC / DCS (host) is changed by nV-
Tool etc., the change is immediately reflected in the hardware clock of the virtual machine
((3) in the figure). At this time, it is not reflected in the Windows system clock ((4) in the
figure), but depending on the Windows setting / environment, the hardware clock may be
referenced and may be reflected to the Windows system clock ((4) in the figure).
Figure B.3 When the host system clock is changed
B.1.3 When the Windows system clock is changed
When Windows's system clock ((4) in the figure) is changed on Windows, the change
is immediately reflected in the hardware clock of the virtual machine ((3) in the figure).
Changes on Windows will not be reflected in the host system clock or hardware clock.
When Windows restarts, the hardware clock of the virtual machine ((3) in the figure) is
reflected by Windows's system clock ((4) in the figure).
Figure B.4 When the Windows system clock is changed
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