LOG (log base 10)

The LOG instruction calculates the logarithm (base 10) of a Real value.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
LOG
LOG
LOG parameters
Parameter
Parameter Type
Data Type
Description
EN
Input
BOOL
When set to true, the instruction is enabled.
  • TRUE: Execute the current computation.
  • FALSE: There is no computation.
Applies to ladder diagram programs.
IN
Input
REAL
The value must be greater than zero.
LOG
Output
REAL
Logarithm (base 10) of the input value. The returned result is -3.4E+38 for a zero IN value and negative IN value.
ENO
Output
BOOL
Enables output. Applies to ladder diagram programs.

LOG examples

LOG function block diagram example
LOG function block diagram example
LOG ladder diagram example
LOG ladder diagram example
LOG structured text example
LOG structured text example
(* ST Equivalence: *)
xpos := ABS (xval);
xlog := LOG (xpos);
Results
Results
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