Mitsubishi Electronics FX3G User Manual
570
FX
3S
/FX
3G
/FX
3GC
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3U
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3UC
Series
Programming Manual - Basic & Applied Instruction Edition
21 Real Time Clock Control – FNC160 to FNC169
21.4 FNC163 – TSUB / RTC Data Subtraction
Cautions
1. Number of occupied devices
Three devices are occupied by
,
and
respectively.
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 built-in PLC real time clock
Read the values of special data registers using the TRD (FNC166) instruction, and then specify those word devices as
the operands.
the operands.
Program example
When the operation result is smaller than "00:00:00"
S
1
S
2
D
X000
FNC163
TSUB
D 10
D 20
D 30
S
1
S
2
D
−
D 11 30 (minute)
D 10 10 (hour)
D 12 10 (second)
D 21 10 (minute)
D 20 3 (hour)
D 22 5 (second)
D 31 20 (minute)
D 30 7 (hour)
D 32 5 (second)
→
10:30:10
3:10:5
7:20:5
(D10, D11, D12)
− (D20, D21, D22)
→ (D30, D31, D32)
−
S
1
20 (minute)
5 (hour)
40 (second)
S
2
10 (minute)
18 (hour)
5 (second)
D
10 (minute)
11 (hour)
35 (second)
→
11:10:35
18:10:5
5:20:40
←
5−18=−13 (<0)