Clock Function - Mitsubishi Electric MELSEC-Q Series User Manual

7 FUNCTION

7.5 Clock Function

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(1) What is Clock Function?
(a) The Basic model QCPU has a clock function in the CPU module.
Because the time data from the clock function can be read by the sequence
program, the time data can be used for time maintenance.
Also, the time data is used for time maintenance for the Basic model QCPU
system functions such as those for failure history.
The clock operations for the clock function are maintained even when the
PLC power is off or when there is a momentary power failure for more than
the permitted time, using the battery (Q6BAT).
(b) Clock Data
The time data is the year, month, day, hour, minute, second, and day of the
week data used for the Basic model QCPU clock element. There are the
following:
Data Name
Year
Month
Day
Hour
Minute
Second
Day of the week
(2) Writing to and Reading from the Time Data Clock Element
(a) The following two methods can be used to write to the time data clock
element.
1) Method to write from GX Developer
The time data is written in the clock element by displaying "Online"
"Set time" window.
Contents
Four digits in AD (Countable from 1980 to 2079)
1 to 12
1 to 31(Automatic leap year calculation)
0 to 23 (24 hours)
0 to 59
0 to 59
0
1
2
3
4
5
6
MELSEC-Q
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
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