Delta DVP-20PM

5 Applied Instructions and Basic Usage
DVP-20PM Application Manual
5-102
API
Applicable model
20PM
122
D
D
EMUL
P
P
Binary floating-point multiplication

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.
Onlyt the 32-bit instructions DEMUL and DEMULP are valid.
16-bit instruction
－ － － －
32-bit instruction (9 steps)
DEMUL
Continuity
instruction
DEMULP
Pulse
instruction
 Flags
Ox O100
M1810 M1970 Carry flag
 Please refer to the additional remark below.
Explanation
 The binary floating-point value in S
1
is multiplied by the binary floating-point
value in S
2
, and the product is stored in D.
 S
1
: Multiplicand; S
2
: Multiplier; D: Product
 If S
1
is a floating-point value, the instruction will be used to multiply S
1
by the
binary floating-point value in S
2
. If S
2
is a floating-point value, the instruction
will be used to multiply the binary floating-point value in S
1
by S
2
.
 S
1
and S
2
can be the same register. If the instruction DEMUL is used under the
circumstances, the value in the register is multiplied by itself whenever the
conditional contact is ON in a scan cycle. Generally, the pulse instruction
DEMULP 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 X1 is ON, the binary floating-point value in (D1, D0) is multiplied by the
binary floating-point value in (D11, D10), and the product is stored in (D21,
D20).
X1
DEMUL D0 D10 D20
Example 2

When X2 is ON, F1234.0 is multiplied by the binary floating-point value in (D1,
D0), and the product is stored in (D11, D10).
X2
DEMUL D0
F1234.0
D10
Additional
remark

Please refer to section 5.3 for more information about performing operations
on floating-point values.