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Arithmetic instructions
F28_DSUB2
Subtracts the 32-bit data or 32-bit equivalent constant specified by s2 from the 32-bit data or 32-bit
Description
equivalent constant specified by s1 if the trigger is in the ON-state. The result is stored in d. All
32-bit values are treated as double 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 16809984
Bit
31 . . 28 27 . . 24 23 . . 20 19 . . 16
s1
Example value 525312
Bit
31 . . 28 27 . . 24 23 . . 20 19 . . 16
s2
Result value 16284672 if trigger is ON
Bit
31 . . 28 27 . . 24 23 . . 20 19 . . 16
d
Availability of F28_DSUB2 (see page 1323)
PLC types
Data types
Variable
Data type
s1
s2
ANY32
d
The variables s1, s2 and d have to be of the same data type.
372
32-bit subtraction, destination can be specified
0 0 0 0
0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 0 0 0
0 0 0 0
0 0 0 0
1 1 1 1
1 0 0 0
Function
minuend
subtrahend
result
15 . . 12 10 . . 8 7 . . 4 3 . . 0
1 0 0 0
0 0 0 0
0 0 0 0
32-bit area
15 . . 12 10 . . 8 7 . . 4 3 . . 0
0 0 0 0
0 1 0 0
0 0 0 0
15 . . 12 10 . . 8 7 . . 4 3 . . 0
0 1 1 1
1 1 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
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