Delta DVP-20PM

5 Applied Instructions and Basic Usage
DVP-20PM Application Manual
5-106
API
Applicable model
20PM
126
D
D
LOG
P
P
Logarithm of a binary floating-point
value

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 DLOG and DLOGP are valid.
16-bit instruction
－ － － －
32-bit instruction (9 steps)
DLOG
Continuity
instruction
DLOGP
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
 S
1
: Device in which the base is stored; S
2
: Source device; D: Device in which
an operation result is stored
 The logarithm of the value in S
2
with respect to the value in S
1
is calculated,
and the operation result is stored in D.
 The values in S
1
and S
2
can only be positive values. D must be a 32-bit
register, and the values in S
1
and S
2
must be floating-point values.
 S
1
D
=S
2
→D=Log
S1
S
2
 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
 When M0 is ON, the values in (D1, D0) and (D3, D2) are converted into binary
floating-point values, and the conversion results are stored in (D11, D10) and
(D13, D12) respectively.
 When M1 is ON, the logarithm of the binary floating-point value in (D13, D12)
with respect to the binary floating-point value in (D11, D10) is calculated, and
the operation result is stored in (D21, D20).
 When M2 is ON, the binary floating-point value in (D21, D20) is converted into
a decimal floating-point value, and the conversion result is stored in (D31,
D30). (The value in D31 is the value in D30 to the power of 10.)
M0
DFLT D0 D10
M1
DLOG D10 D12
M2
DEBCD D20 D30
DFLT D2 D12
D20
Additional

Pl
rema
rk
ease refer to section 5.3 for more information about performing operations on
floating-point values.