Real-Time Clock (Rtc) - Kinco MK Series User Manual

Kinco-MK
User Manual
battery (Replaceable but un-rechargeable) for data retentive. When CPU loses power, the data
in the RAM will be maintained by the lithium battery, and the retentive ranges will be left
unchanged at next power on.Through [Hardware] configuration in KincoBuilder, user can
select the type of data retentive (Such as V,C area) and the range. The life of battery is 5 years
and the retaining duration is 3 years at normal temperature.
Data backup is that CPU provides an E 2 PROM to store data permanently. At power on, the
CPU will restore the data from E PROM into RAM to execute.
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Note: Because E
2 PROM has a writing limit of 1 million times, users should avoid to write
data into data backup area frequently.
There are 448 bytes in V area for data backup (VB3648--VB4095),the data in this area will
save in E2PROM automatically.HMI-PLC sets VB3648--VB3902 as data backup by default,if
user needs to use VB3903--VB4095 for data backup,it needs to configure in 【PLC hardware
configuration】.The configuration interface is as following figure.

2.1.7 Real-time Clock (RTC)

The real-time clock built in the all CPU modules can provide real-time clock/calendar
indication. Users need to use KincoBuilder【PLC】->【Time of Day Clock...】to set the clock
when using RTC first time. Then users can use real-time clock instructions（READ_RTC、
SET_RTC、RTC_W、RTC_R）.
After CPU power off, the real-time clock can be maintained by lithium battery. The life of
battery is 5 years and the retaining duration is 3 years at normal temperature.
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