ActiGRAF Help : MASTER25 Real Time Clock Description

The MASTER25 provides a real time clock.
When the board is disconnected from the battery voltage (VBAT), the data retention of the real time clock is more than 4 days.
The real time clock accuracy is less than 1 min per month at 25°C.
The time and date values can be set and read by the applicative software (see mnemonics description in the table below below), and diagnostic tool.

##### 1 - Parameters Description

##### 2 - Mnemonics Description

Mnemonic | STraToN Type | Description
--- | --- | ---
Year | WORD | To read the RTC year.
Min | WORD | To read the RTC minute.
Sec | WORD | To read the RTC seconds.
Date | WORD | To read the RTC date,it refers to the day in the Month (1-31).
Hour | WORD | To read the RTC hours
Month | WORD | To read the RTC month
DayOfWeek | WORD | To read the RTC day of the week.
Status_RTC | BOOL | is set to "1" to inform Master that RTC is updating. After that Date/Time has been successfully updated in RTC Status_RTC is reset to "0" for at least a transmission period of RTC_STATUS_Frame. If a default appeared on RTC oscillator may have corrupted RTC data validity, Status_RTC is set to "1"
Status_Alarm1 | BOOL | is set to "1" to inform Master that Alarm1 is updating. After that Date/Time for Alarm1 has been successfully updated in RTC Status_Alarm1 is reset to "0" for at least RTC_STATUS_PER.
Status_Alarm2 | BOOL | is set to "1" to inform Master that Alarm2 is updating. After that Date/Time for Alarm1 has been successfully updated in RTC Status_Alarm2 is reset to "0" for at least RTC_STATUS_PER.

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