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