Numeric Functions (Logarithm Functions); Natural Logarithm - Mitsubishi Electric MELSEC Q Series Programming Manual

6 IEC FUNCTIONS

6.3 Numeric Functions (Logarithm Functions)

6.3.1 Natural logarithm

The natural logarithm of the specified data is operated.
Function definition
Function definition
6 - 23
LN
LN_E
REAL LN( REAL S1 );
Argument
Argument Name IN/OUT
S1 IN
Return value
Return Value
REAL Natural logarithm operation result (real number data)
Remarks:
Example of use
Argument Type
REAL r_data1 := LN( 1.23456 );
BOOL LN_E( BOOL EN, REAL S1, REAL D1 );
Argument
Argument Name IN/OUT
EN IN
S1 IN
D1 OUT
Return value
Return Value
BOOL Execution condition
Example of use
(* When execution condition X0 turns ON, the natural logarithm of the data
(* stored in rData is found, and the result is stored into Result.
M0 := LN_E( X0, rData, Result ) ;
Data whose natural logarithm will be found (real number data)
ST Program Conversion Result
LD
LOG
Execution condition (Function is executed only when the result is TRUE)
Data whose natural logarithm will be found (real number data)
Natural logarithm operation result (real number data)
Description
Description
Used Instruction
SM400 LD,LOG
E1.23456
r_data1
Description
Description
*)
*)
6 - 23