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6  CLOCK FUNCTION
6.1  Time Setting

The CPU module has an internal clock and is used to manage time in functions performed by the system such as dates of the 
error history.

Time operation continues with the large internal capacitor in the CPU module even though the power in the CPU module is 
turned OFF or the power failure exceeds the allowable momentary power failure time.
If an optional battery is used, operation continues by the battery.

The clock data handled in the CPU unit is described below.

The clock data can be changed using the following methods.
 • Using engineering tools
 • Using SM/SD
 • Using instructions

Clock data can be changed using Set Clock from the menu. (GX Works3 Operating Manual)

The values stored in SD210 (clock data) to SD216 (clock data) are written to the CPU module after END processing execution 
of scan when SM210 (clock data set request) is changed from OFF

ON. If the data from SD210 to SD216 is out of the valid 

range, SM211 (clock data set error) is turned ON, the values from SD210 to SD216 are not written in the CPU module.

Writes the clock data to the CPU module, using the TWR(P) instruction. (MELSEC iQ-F FX5 Programming Manual 
(Instructions, Standard Functions/Function Blocks))

Year

4 digits in calendar year (1980 to 2079)

Month

1 to 12

Day

1 to 31 (Leap year auto detect)

Hour

0 to 23 (24-hour system)

Minute

0 to 59

Second

0 to 59

Day-of-the-week

0: Sunday, 1: Monday, 2: Tuesday, 3: Wednesday, 4: Thursday, 5: Friday, 6: Saturday

END

END

ON

Writes the SD210 to SD216 clock data to the CPU module.

If the SD210 to SD216 clock data is out of the range

ON

OFF

OFF

SM211

SM210