Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1961

Operation error
Error code Description
(SD0)
2820H There is no NULL code (00H) in the label or device area (between the specified device number and the last device number) specified by (s1).
There is no NULL code (00H) in the label or device area (between the specified device number and the last device number) specified by (s2).
3405H The number of characters in the string input to (s1) exceeds 255.
The number of characters in the string input to (s2) exceeds 255.
The value input to (n1) is out of the range, 0 to 255.
The value input to (n2) is out of the range, 1 to 255.
The value input to (n1) exceeds the number of characters in (s2).
The value input to (n2) exceeds the number of characters in (s1).
3406H The entire string after delete processing cannot be stored in the label or device area (between the specified device number and the last
device number) specified by (d).
32 STRING FUNCTIONS
1959
32.7 Replacing String Data
32