Chapter 6 Function of CPU Module
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6.2 Clock
CPU module has a built-in clock device (RTC). RTC continues the clock action by battery backup even in case
of power off or instantaneous interruption.
It is available to perform the time management such as operation history or failure history of system by using a
clock data of RTC. The current time of RTC can be updated in F device related to the clock every scan.
1) Read and Setting from XG5000
Click ‘PLC RTC’ from ‘PLC information’ of online mode.
The time of PLC RTC is displayed. If the time of PLC RTC is wrong, you can adjust the time correct by
setting the time directly to transmit to PLC or selecting ‘Synchronize with PC clock’ that transmits the time
of PC connected to PLC.
2) RTC Read by Device
It is available to monitor RTC by special device as shown on the table below.
RTC Read F device
Data example
Description
_MON_YEAR (F0053)
h0599
May xx99
_TIME_DAY (F0054)
h1512
12(day), 15 (time)
_SEC_MIN (F0055)
h4142
42min 41sec
_HUND_WK (F0056)
h2001
Monday 20xx
RTC Data of _TIME_DAY_DT is displayed by 24hours system.