Mitsubishi Electric MELSEC FX3U Programming Manual page 597

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Cautions
1) Number of occupied devices
Three devices are occupied by
Make sure that these devices are not used in other controls for the machine.
2) When utilizing the time (hour, minute, and second) of the real time clock built in a PLC
Read the values of special data registers using TRD (FNC166) instruction, and then specify those word
devices as the operands.
Program example
X000
FNC163
TSUB
D 10 10 (hour)
D 11 30 (minute)
D 12 10 (second)
10:30:10
When the operation result is smaller than "00:00:00"
S
1
5 (hour)
20 (minute)
40 (second)
5:20:40
,
S S
1 2
S S D
1 2
D 10 D 20 D 30
D 20 3 (hour)
− →
D 21 10 (minute)
D 22 5 (second)
3:10:5
S
2
18 (hour)
− →
10 (minute)
5 (second)
18:10:5
21 Real Time Clock Control – FNC160 to FNC169
21.4 FNC163 – TSUB / RTC Data Subtraction
and respectively.
D
( D10, D11, D12) − (D20, D21, D22)
→ ( D30, D31, D32)
D 30 7 (hour)
D 31 20 (minute)
D 32 5 (second)
7:20:5
D
←
11 (hour)
5−18=−13 (<0)
10 (minute)
35 (second)
11:10:35
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