Upon the occurrence of an event at the REQ input, an instance of this Simple FB type sets the OUT value to the result of removing the characters in positions {P..P+L-1} from the value of the IN input and issues an event at the CNF output.

• Following the IEC 61131-3 convention, the index of the leftmost character position is 1.
• If P = 0, the result is the same as if P = 1.
• If P > N, where N is the number of characters in IN, the value of IN is just copied to OUT.
• If the values of P and L are such that deletion would proceed beyond the end of the IN string, deletion just proceeds to the end of the string.