Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 526

(a) Program before replacement
(b) Program after replacement
524
The device offset values for input
(X), output (Y), internal relay (M),
data register (D), link register (W),
and pointer (P) are set to the index
modification table starting from D0.
The device offset values specified
by the IXDEV and IXSET
instructions are set to the index
modification table starting from D0.