Function - Extract characters of a string on the left.
IN : STRING
NBC : DINT Number of characters to extract
Q : STRING String containing the first NBC characters of IN.
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.
Q := LEFT (IN, NBC);
(* The function is executed only if EN is
(* ENO keeps the same value as EN *)
+ MLEN DELETE INSERT FIND REPLACE RIGHT MID