LEFT
Extracts the left part of a message string. The number of characters to be extracted is given.
Arguments | |||
|---|---|---|---|
IN | IN | MESSAGE | Any non-empty string |
NbC | NbC | DINT | Number of characters to be extracted. This number cannot be greater than the length of the IN string. |
LEFT | Q | MESSAGE | Left part of the IN string (its length = NbC) empty string if NbC <= 0 complete IN string if NbC >= IN string length |
Example
(* FBD Program using "LEFT" and "RIGHT" Functions *)
(* ST Equivalence: *)
complete_string := RIGHT ('12345678', 4) + LEFT ('12345678', 4); (* complete_string is '56781234' the value issued from RIGHT call is '5678' the value issued from LEFT call is '1234' *)
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