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Arithmetic instructions
F27_SUB2
Subtracts the 16-bit data or 16-bit equivalent constant specified by s2 from the 16-bit data or 16-bit
Description
equivalent constant specified by s1 if the trigger EN is in the ON-state. The result is stored in d. 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 27
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
s
Example value 16
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
Result value 11 if trigger is ON
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
Availability of F27_SUB2 (see page 1323)
PLC types
Data types
Variable
Data type
s1
s2
ANY16
d
The variables s1, s2 and d have to be of the same data type.
Operands
For
s1, s2
d
370
16-bit subtraction, destination can be specified
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 0
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 1 1
Function
minuend
subtrahend
result
Relay
WX
WY
WR
WL
-
WY
WR
WL
T/C
Register
SV
EV
DT
LD
FL
SV
EV
DT
LD
FL
Constant
dec. or hex.
-
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