LEFT

Function - Extract characters of a string on the left.

Inputs

IN : STRING   Character string
NBC : DINT    Number of characters to extract

Outputs

Q : STRING    String containing the first NBC characters of IN.

Remarks

In LD language, the operation is executed only if the input rung (EN) is TRUE. The output rung (ENO) keeps the same value as the input rung. In IL, the first input (the string) must be loaded in the current result before calling the function. The second argument is the operand of the function.

ST Language

Q := LEFT (IN, NBC);

FBD Language

LD Language

(* The function is executed only if EN is TRUE *)
(* ENO keeps the same value as EN *)

IL Language:

Op1: LD     IN
     LEFT   NBC
     ST     Q

See also

+   MLEN   DELETE   INSERT   FIND   REPLACE    RIGHT   MID