Arithmetic instructions
366
Part III FP Instructions
F25_SUB
16-bit subtraction
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.
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1
15 . . 12 10 . . 8 7 . . 4 3 . . 0
s
0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1
Example value 16
Bit
Example value 27
Bit
Result value -11 if trigger is ON
Bit
PLC types
Availability of F25_SUB (see page 1323)
Variable Data type Function
s subtrahend
d
ANY16
minuend and result
The variables s and d have to be of the same data type.
For Relay T/C Register Constant
s WX WY WR WL SV EV DT LD FL dec. or hex.
d - WY WR WL SV EV DT LD FL -
Description
Subtracts the 16-bit equivalent constant or 16-bit area specified by s from the 16-bit area specified
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.
Data types
Operands
To Next Page
Loading...
