Mitsubishi MELSEC Q Series User Manual page 202

6 PARAMETER SETTINGS
6 - 36
(j) Set the special register (SW) refresh device using "Special register (SW)".
Default value : None
Setting range: Device name - Select from M, L, B, D, W, R, SW or
Example) Set to SW0.
POINT
When setting X, Y, B, W, SB and SW as refresh devices, make setting so that they
do not overlap with the device numbers used on the other networks, etc.
ZR.
Device number - Within the range of the device
points that the CPU has.
MELSEC-Q
6 - 36