Mitsubishi MELSEC Q Series, Programming Manual

Page: 671 / 816

7.15 Clock Instructions
7.15.4 Clock data subtraction
7-331
7
APPLI
C
A
T
IO
N
INSTRUCTIONS
DA
T
E
-
DATE-
(2) If the operation results in a negative number, 24 will be added to the result to make a final
operation result.
For example, if the clock time 10:42:12 were subtracted from 4:50:32, the result would not
be 6:8:20, but rather would be 18:8:20.
Remark
For further information regarding the data that can be set for hours, minutes, and
seconds, refer to Section 7.15.2.
O peration Error
In any of the following cases, an operation error occurs, the error flag (SM0) is turned ON, and
the corresponding error code is stored to SD0.
• The value set for and is outside of the setting range. (Error code: 4100)
• The device specified for , or exceeds the corresponding device range. (For
Universal model QCPU only) (Error code: 4101)
Program Example
In the following program, the time data stored in Var_D10 and the following devices are
subtracted from the clock data read from the clock element when X1C turns ON, and the result is
stored to Var_R10 and the following devices.
[Structured ladder]
H our : 10
Mi nute : 42
S econ d: 12
H our : 18
Mi nute : 8
S econ d: 20
H our : 4
Mi nute : 50
S econ d: 32
s 1
s 2
d
s 1
s 1
s 2
s 2
d
d
[1]
[0]
[2]
[1]
[0]
[2]
[1]
[0]
[2]
s 1 s 2
s 1 s 2 d