A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Extract characters of a string at any position.
Inputs
IN : STRING Character string
NBC : DINT Number of characters to extract
POS : DINT Position of the first character to extract (first character of IN is at
position 1)
Outputs
Q : STRING String containing the first NBC characters of IN.
Remarks
The first valid position is 1. In FFLD 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 "Instruction list"
This is a low-level language and resembles assembly, the first input (the string) must be loaded in the current result before
calling the function. Other arguments are operands of the function, separated by comas.
ST Language
Q := MID (IN, NBC, POS);
FBD Language
FFLD Language
(* The function is executed only if EN is TRUE *)
(* ENO keeps the same value as EN *)
IL Language:
See also
