MID (extract middle of a string)

The MID instruction extracts characters from the middle of a string. Use the position and number of characters provided to calculate the required parts of strings.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
MID
MID
MID parameters
Parameter
Parameter Type
Data Type
Description
EN
Input
BOOL
Instruction enable.
  • TRUE: Generate portion of a string.
  • FALSE: No generate operation.
Applies to ladder diagram programs.
IN
Input
STRING
Any non-empty string.
NbC
Input
DINT
Number of characters to be extracted cannot be greater than the length of the IN string.
Pos
Input
DINT
Position of the sub-string. The sub-string first character will be the one pointed to by Pos (first valid position is 1).
MID
Output
STRING
Middle part of the string (its length = NbC). When the number of characters to extract exceeds the length of the IN string, NbC is automatically recalculated to get the remainder of the string only. When NbC or Pos are zero or negative numbers, an empty string is returned.
ENO
Output
BOOL
Enable output.
Applies to ladder diagram programs.

MID examples

MID function block diagram example
MID function block diagram example
MID ladder diagram example
MID ladder diagram example
MID structured text example
MID structured text example
(* ST Equivalence: *)

sub_string := MID ('abcdefgh', 2, 4);

(* sub_string is 'de' *)
Results
Results
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