Mitsubishi Electronics Q173CPU(N) ユーザーズマニュアル
7 - 32
7 OPERATION CONTROL PROGRAMS
F/FS G
7.6.8 Natural logarithm : LN
Format
LN(S)
Number of basic steps
2
[Usable data]
Usable Data
Word device
Constant
Setting
data
Bit device
16-bit
integer
type
32-bit
integer
type (L)
64-bit
floating
point
type (F)
Coasting
timer
16-bit
integer
type (K/H)
32-bit
integer type
(K/H, L)
64-bit
floating
point
type (K)
Calculation
expression
Bit
conditional
expression
expression
Comparison
conditional
expression
expression
(S) —
— —
: Usable
[Setting data]
Setting data
Description
Data type of result
(S)
Data on which natural logarithm operation will be
performed
Floating-point type
[Functions]
(1) The base e natural logarithm of the data specified with (S) is found.
(2) Only a positive number may be specified with (S). (Operation cannot be
performed with a negative number.)
(3) If (S) is an integer type, it is converted into a floating-point type before operation is
performed.
[Errors]
(1) An operation error will occur if:
• (S) is 0 or a negative number; or
• (S) is an indirectly specified device and its device No. is outside the range.
• (S) is an indirectly specified device and its device No. is outside the range.
[Program examples]
(1) Program which finds the natural logarithm of D0F and substitutes the result to #0F
#0F = LN(D0F)
#3
#2
2.3025850929940
#1
#0
D3
D2
10.0
D1
D0