7 Applied Instructions
7.15 Real Time Clock Control
578
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
3) When handling the year in four digits, please add the following program.
D8018 operates in four-digit year mode from the second scan after RUN of PLC.
a) Usually, the PLC operates in two-digit year mode. After RUN of PLC, by executing the above
instruction, and transferring K2000 (fixed value) to D8018 (year) for one operation cycle only, the
operation is changed to four-digit mode.
b) This program must be executed every time the PLC is set to RUN. By transferring K2000, only the
year display is changed to four-digit mode, and the present time is not changed.
c) In the case of four-digit mode of the year, 80 to 99 correspond to 1980 to 1999, and 00 to 79
correspond to 2000 to 2079.
Example: 80=1980, 99=1999, 00=2000, 79=2079
4) When connecting with the data access unit of FX-10DU, FX-20DU, FX-25DU types, please set the year in
two-digit mode. If set in four-digit mode, the year is not displayed correctly in the present versions of
these DU types.
When the PLC is in four-digit mode, if the clock is set from FX-10DU, 20DU, 25DU, it must be noted that
the mode is changed to two-digit mode.
M8002
Initial pulse
MOV
EN
s
ENO
d
D8018K2000
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