Yaskawa Ladder Works Programming Manual - Manual (Page 96)

5.9 NATURAL LOGARITHM Instruction (LN)
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5.9 NATURAL LOGARITHM Instruction (LN)
[Outline]
The LN instruction uses the Source as the input (x) and stores the natural logarithm (Log
e
x ) of the
input in the Dest as the operation result. This instruction can be used only in a real number operation.
[Format]
Symbol : LN
Full Name : Natural Logarithm
Category : FUNCTION
Icon :
[Parameter]
Parameter Name Setting
Source
(Input) · Any real number type register
· Any real number type register with subscript
· Constant
Dest
(Output) · Any real number type register (except for # and C register)
· Any real number type register with subscript (except for # and C register)
[Program Example]
The natural logarithm of the input value (x = 10.0) [Log
e
(x) = 2.3026] is calculated.
Notes: LN instruction is input(x) value is checked, execute the following handling.
· When the input is minus LN (-1), calculate a absolute value
· When the input is zero LN (0), take -∞ for solution.