Mitsubishi Electric R32MTCPU - Natural Logarithm: LN

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4 OPERATION CONTROL PROGRAMS
4.7 Standard Functions
Natural logarithm: LN
Setting data
■Usable data
: Usable
■Description, data type of result
Processing details
• The base e natural logarithm of the data specified with (S) is found.
• Only a positive number may be specified with (S). (Operation cannot be performed with a negative number.)
• If (S) is an integer type, it is converted into a floating-point type before operation is performed.
Operation error
An operation error will occur if:
• (S) is 0 or a negative number.
• (S) is an indirectly specified device and its device No. is outside the range.
Program example
■Program which finds the natural logarithm of D0F and substitutes the result to #0F
Format Number of basic steps Usable steps
F/FS G
LN(S) 4 
Setting
data
Usable Data
Bit
device
Word device Constant Calculation
expression
Bit
conditional
expression
Comparison
conditional
expression
16-bit
integer
type
32-bit
integer
type (L)
64-bit
floating
point
type (F)
16-bit
integer
type
(K/H)
32-bit
integer
type
(K/H, L)
64-bit
floating
point
type (K)
(S)   
Setting data Description Data type of result
(S) Data on which natural logarithm operation will be performed Floating-point type
#0F = LN(D0F)
2.3025850929940
#2 #1#3 #0
#0F 10.0
D2 D1D3 D0
D0F