Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 502

Operation error
Error code Description
(SD0)
3405H Any one of (n1), (n2), or (n3) is other than 1 to 4.
Either (s) or (d) is other than 0 to 9999 when SM773 is OFF.
(n2) is greater than (n1) or (n3).
6 BASIC INSTRUCTIONS
500
6.7 Data Transfer Instructions