Upon the occurrence of an event at the REQ input, an instance of this FB type sets the OUT value to the result of inserting the value of the IN2 input at the position immediately following the P -th character of the value of the IN1 input, and then 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 appending the value of IN1 to the value of IN2.
• If P ≥ N, where N is the number of characters in IN1, the result is the same as appending the value of IN2 to the value of IN1.