Mitsubishi MELSEC-A Series Reference Manual page 146

7. DATA LINK SETTINGS
(b) Refresh range setting for LW
1) The refresh destinations of LW are the link register (W).
2) The transfer size is in units of 1 point.
(c) Refresh range setting for LX/LY
1) The refresh destination of LX is the input (X), and that of LY is the output (Y)
The actual I/O and later can be set as the refresh destination.
Since this area is also used for MELSECNET/10, MELSECNET/MINI,
CC-Link, etc., assign it without overlapping.
2) The transfer size is in units of 16 points.
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