Delta DVP-20PM

5 Applied Instructions and Basic Usage
DVP-20PM Application Manual
5-101
API
Applicable model
20PM
121
D
D
ESUB
P
P
Binary floating-point subtraction

Bit device Word device
X Y M S F H KnX KnY KnM KnS T C D V Z
S
1
＊ ＊
S
2
＊ ＊
D
＊
 Note: Please refer to specifications for more information about device
ranges.
F represents a floating-point value. There is a decimal point in a
floating-point value.
Only the 32-bit instructions DEADD and DEADDP are valid.
16-bit instruction
－ － － －
32-bit instruction (9 steps)
DESUB
Continuity
instruction
DESUBP
Pulse
instruction
 Flags
Ox O100
M1808 M1968 Zero flag
M1809 M1969 Borrow flag
M1810 M1970 Carry flag
 Please refer to the additional remark below.
Explanation
 The binary floating-point value in S
2
is subtracted from the binary floating-point
value in S
1
, and the difference is stored in D.
 S
1
: Minuend; S
2
: Subtrahend; D: Difference
 If S
1
is a floating-point value, the instruction will be used to subtract the binary
floating-point value in S
2
from S
1
. If S
2
is a floating-point value, the instruction
will be used to subtract S
2
from the binary floating-point value in S
1
.
 S
1
and S
2
can be the same register. If the instruction DESUB is used under the
circumstances, the value in the register is subtracted from itself whenever the
conditional contact is ON in a scan cycle. Generally, the pulse instruction
DESUBP is used.
 If the absolute value of an oepration result is greater than the maximum
floating-point value available, a carry flag will be ON.
 If the absolute value of an oepration reuslt is less than the minimum
floating-point value available, a borrow flag will be ON.
 If an operation result is 0, a zero flag will be ON.
Example 1

When X0 is ON, the binary floating-point value in (D3, D2) is subtracted from
the binary floating-point value in (D1, D0), and the difference is stored in (D11,
D10).
X0
DESUB
D0
D2
D10
Example 2
 When X2 is ON, the binary floating-point value in (D1, D0) is subtracted from
F1234.0, and the difference is stored in (D11, D10).
X2
DESUB
D0
F1234.0
D10
Additional

rema
rk
Please refer to section 5.3 for more information about performing operations on
floating-point values.