Mitsubishi Electric MELIPC MI5000 Series User Manual page 30

Daylight saving adjustment timing
The following shows the daylight saving adjustment timing.
Product daylight saving time is adjusted at the following times.
• On the start date and end date of daylight saving time
• When turning the power supply of this product OFF to ON or at a reset of this product
Operation during daylight saving time
The following shows the product operation during daylight saving time.
While using daylight saving time, functions that use clock data operate as follows.
Function name
Clock data reading
Clock data writing
Daylight saving time operation check
Daylight saving time function operation can be checked as follows.
■Event history
The start/end history of daylight saving time is saved. ( Page 111 Event History Function)
Precautions
■On the start date and end date of daylight saving time
• The clock data cannot be changed to less than one hour from the starting time of the daylight saving time.
• For the period less than one hour from the start time or less than one hour until the end time of daylight saving time,
functions that are triggered by time may not work because of a time condition not being met or may work twice because of
a time condition being met twice.
• Setting of clock data within one hour from the daylight saving time end will result in different set execution times being set
depending on whether within or outside daylight saving time.
■Occurrence dates during daylight saving time
When daylight saving time setting is enabled, operation occurs using the date and time information after the correction for
daylight saving time. As a result, dates and times output by functions that use clock data switch from "before correction" to
"after correction", and sorting in order of occurrence number and date and time of occurrence may not match. Consequently,
when checking output results in chronological order, sort by occurrence number, not date and time of occurrence.
■Daylight saving time settings of the Windows part
Match the daylight saving time settings of the VxWorks part with the daylight saving time settings of the Windows part. If the
settings of the VxWorks part and Windows part do not match, time data such as error and event occurrence times may not
match.
To enable the time zone settings of the Windows part, browse to "Date and Time", "Time Zone Settings", and then select the
"Automatically adjust clock for Daylight Saving Time" check box.
*1 Daylight saving time can be configured if a time zone that uses daylight saving time is set.
Windows Start  [Windows System Tools]  [Control Panel]  [Clock, Language, and Region]  [Date and Time]
If the time zone is changed, the start time and end time of daylight saving time is changed automatically when
switching between daylight saving time and winter time to match the changed time zone in accordance with
Windows specifications. For details, check the specifications of Windows.
2 CLOCK FUNCTION
28
2.3 Daylight Saving Time Setting
Description
Reads clock data following adjustment for daylight saving time.
Writes clock data following adjustment for daylight saving time.
* 1