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Arithmetic instructions
F25_SUB
Subtracts the 16-bit equivalent constant or 16-bit area specified by s from the 16-bit area specified
Description
by d if the trigger EN is in the ON-state. The result is stored in d (minuend area). All 16-bit values
are treated as integer values.
This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which
is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the
"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears
under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming
area to open the list of recently used elements.
Instead of using this FP instruction, we recommend using the related IEC instruction SUB (see
page 62). Please refer also to Advantages of the IEC instructions in the online help.
Example value 16
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
Example value 27
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
s
Result value -11 if trigger is ON
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
Availability of F25_SUB (see page 1323)
PLC types
Data types
Variable
Data type
s
ANY16
d
The variables s and d have to be of the same data type.
Operands
For
WX
s
-
d
366
16-bit subtraction
0 0 0 0
0 0 0 0
0 0 0 1
1 0 1 1
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 0
1 1 1 1
1 1 1 1
1 1 1 1
0 1 0 1
Function
subtrahend
minuend and result
Relay
T/C
WY
WR
WL
SV
WY
WR
WL
SV
Register
EV
DT
LD
FL
EV
DT
LD
FL
Constant
dec. or hex.
-
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