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M
ain
Chapter 2 CPU Function
2-13
2.4 RTC Function
The high-performance XGB basic unit has the embedded clock (RTC) function that keeps running by battery backup
even when the power is off. The time data of the embedded RTC can be used for time management such as the
system’s operating history or failure history, etc. The RTC’s current time is updated every scan by the flags for the
system’s operating state information.
2.4.1 How to use the RTC
(1) Reading/Setting clock data
(a) Reading the data from XG5000 and setting
1) Click
『
Online
』
-
『
Diagnosis
』
-
『
PLC information
』
.
2) Click the PLC clock tab of
『
PLC information
』 .
3) If you want to send the time of the PC to the PLC, click ‘Synchronization with PC clock’ button.
4) If you want to set up the user defined time, after changing set values of the data and time box, click ‘Send to
PLC’.
(b) Reading with the special relay
You can monitor the data by the special relay as shown in the below example.
Word Flag Name Name Data Description
%FW53 _MON_YEAR Clock data(month/year) H0709 Sep, 2007
%FW54 _TIME_DAY Clock data(hour/day) h1214 14:00, 12
th
%FW55 _SEC_MIN Clock data(second/minute) H2040 20 minutes 40 seconds
%FW56 _HUND_WK
Clock data(century/day of
week)
H2003 2000s,Wed.