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FX3G/FX3U/FX3UC Series Programmable Controllers
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 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
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)
→
11:10:3518:10:55:20:40
←
5
−
18=
−
13 (<0)