MLEN (string length)

The MLEN instruction calculates the length of a string.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
MLEN
MLEN
MLEN parameters
Parameter
Parameter Type
Data Type
Description
EN
Input
BOOL
Instruction enable.
  • TRUE: Calculate length of string.
  • FALSE: No operation.
Applies to ladder diagram programs.
IN
Input
STRING
Any string.
MLEN
Output
DINT
Number of characters in the IN string.
ENO
Output
BOOL
Enable output.
Applies to ladder diagram programs.

MLEN examples

MLEN function block diagram example
MLEN function block diagram example
MLEN ladder diagram example
MLEN ladder diagram example
MLEN structure text example
MLEN structure text example
(* ST Equivalence: *)

nbchar := MLEN (complete_string);

If (nbchar < 3) Then Return; End_if;

prefix := LEFT (complete_string, 3);

(* this program extracts the 3 characters on the left of the string and puts the result in the prefix string variable. Nothing is done if the string length is less than 3 characters *)
Results
Results
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