Arithmetic instructions
388
Part III FP Instructions
F58_DBDEC
8-digit BCD decrement
31 . . 28 27 . . 24 23 . . 20 19 . . 16
15 . . 12 10 . . 8 7 . . 4 3 . . 0
s
1 0 0 0 0 1 1 1 0 1 1 0 0 1 0 1
0 1 0 0 0 0 1 1 0 0 1 0 0 0 1 0
16# BCD
31 . . 28 27 . . 24 23 . . 20 19 . . 16
15 . . 12 10 . . 8 7 . . 4 3 . . 0
d
1 0 0 0 0 1 1 1 0 1 1 0 0 1 0 1
0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 1
16# BCD
8 7 6 5 4 3 2 2
8 7 6 5 4 3 2 1
Example value 87654322 (BCD)
Bit
Bit
Result value 87654321 (BCD)
Trigger: ON
32-bit area
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.
PLC types
Availability of F58_DBDEC (see page 1325)
Variable Data type Function
d DWORD 32-bit area for BCD data to be decreased by 1
For Relay T/C Register Constant
d - DWY DWR DWL DSV DEV DDT DLD DFL -
No. IEC address Set If
R900B %MX0.900.11 for an instant the calculated result is 0.
R9009 %MX0.900.9 for an instant the result exceeds the range of 8-digit
BCD data (underflow).
Description
Subtracts "1" from the 8-digit BCD data specified by d if the trigger EN is in the ON-state. The
result is stored in d.
Data types
Operands
Error flags
Example
In this example the function has been programmed in ladder diagram (LD) and structured text
(ST).The same POU header is used for all programming languages.
POU header
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