Mitsubishi Electric MELSEC FX3U Programming Manual page 535

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Program example
In the program example shown below, natural logarithm of "10" set in D50 is calculated, and stored to D30
and D31 when X000 turns ON.
X000
[1]
10
MOV
FNC 12
K10
MOV
FNC 49
D50
FLT
FNC125
D40
DLOGE
[2] Conversion into
D50
binary floating point
b15 b0
(real number)
10
Binary value
FLT
18 Floating Point – FNC110 to FNC139
18.13 FNC125 – LOGE / Floating Point Natural Logarithm
Data used in the natural logarithm operation is set
D50
([1]).
The data to be used is converted into binary floating
D40
point (real number) ([2]).
D30 The natural logarithm operation is executed ([3]).
END
[3] Logarithm
D41 D40
operation
10
Binary floating point
LOGE
(real number) value
D31 D30
2.302585
Binary floating point
(real number) value
533
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