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Arithmetic instructions
F37_DEC
Subtracts "1" from the 16-bit data specified by d if the trigger EN is in the ON-state. The result is
Description
stored in d.
Example value 17
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
Result value 16 if trigger is ON
Bit
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
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.
Availability of F37_DEC (see page 1325)
PLC types
Data types
Variable
Data type
INT, WORD
d
Operands
For
d
Error flags
No.
IEC address
%MX0.900.11
R900B
%MX0.900.9
R9009
In this example, the same POU header is used for all programming languages. For an example
Example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
When the variable start is set to TRUE, the function is carried out.
382
16-bit decrement
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 0
Function
16-bit area to be decreased by 1
Relay
-
WY
WR
WL
Set
for an instant
for an instant
T/C
Register
SV
EV
DT
LD
FL
If
the calculated result is 0.
the result exceeds the range of 16-bit
data (underflow).
Constant
-
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