832
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
36 Operation of Special Devices (M8000 -, D8000 -)
36.2 Supplement of Special Devices (M8000 - and D8000 -)
36.2.6
Internal clock [M8011 to M8014]
The PLC has the following four types of internal clocks which are always oscillating while the PLC power is
ON.
36.2.7
Real time clock [M8015 to M8019 and D8013 to D8019]
1. Assignment of special auxiliary relays (M8015 to M8019) and special data registers (D8013
to D8019)
→
For the real time clock setting method, refer to Subsection 36.2.8.
Number
Name
Operation and function
M8015
Clock stop and preset
When M8015 turns ON, the real time clock is stopped.
At the edge from ON to OFF, the time from D8013 to D8019 is written to the PLC
and the clock is started again.
M8016
Time read display is
stopped
When M8016 turns ON, the time display is stopped (but RTC is continued).
M8017
±30 seconds correction
At the edge from OFF to ON, the RTC is set to the nearest minute.
(When the second data is from 0 to 29, it is set to 0. When the second data is from
30 to 59, it is set to 0 and the minute data is incriminated by "1".)
M8018
Installation detection
This device is always ON.
M8019
Real time clock (RTC)
error
When the data stored in special data registers is outside the allowable time, setting
range this device turns ON.
Number
Name
Set value range
Operation and function
D8013
Second data
0 to 59
Use these devices for writing the initial value in time setting
or read the present time.
•
D8018 (year data) can be changed over to the four-digit
year mode.
In the four-digit year mode, 1980 to 2079 can be
displayed.
•
Clock accuracy: ±45 sec/month (at 25
°
C)
•
Leap year correction: Provided
D8014
Minute data
0 to 59
D8015
Hour data
0 to 23
D8016
Day data
1 to 31
D8017
Month data
1 to 12
D8018
Year data
00 to 99
(last two digits of year)
D8019
Day-of-the-week data
0 to 6
(which corresponds to
Sunday to Saturday)
10ms
100Hz
100ms
10Hz
1s
1min
M8011
(10ms)
M8012
(100ms)
M8013
(1 sec)
M8014
(60 sec)
Caution:
Even while the PLC is in the STOP mode, these clocks are always
oscillating. Therefore, the rising edge of the RUN monitor (M8000)
does not synchronize with the clock start timing.
1Hz