Natural Logarithm: Ln - Mitsubishi Electric R16MTCPU Programming Manual

Natural logarithm: LN

Format
LN(S)
Setting data
■Usable data
: Usable
Setting Usable Data
data
Bit
device

(S)
■Description, data type of result
Setting data
(S)
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
#0F = LN(D0F)
#3 #2
#0F 2.3025850929940
4 OPERATION CONTROL PROGRAMS
152
4.7 Standard Functions
Number of basic steps
4
Word device
16-bit 32-bit 64-bit
integer integer floating
type type (L) point
type (F)
  
Description
Data on which natural logarithm operation will be performed
#1 #0
Usable steps
F/FS

Constant
16-bit 32-bit 64-bit
integer integer floating
type type point
(K/H) (K/H, L) type (K)
  
D3 D2
D0F 10.0
G

Calculation Bit
expression conditional
expression
 
Data type of result
Floating-point type
D1 D0
Comparison
conditional
expression
