Mitsubishi Electric MELSEC Q Series Reference Manual page 195

(1) Specify I/O master station
Set an I/O master station for each block to perform communication using LX/LY.
1.
Select a desired block in [Switch screens] to specify an I/O master station.
2.
Selecting a station No. and clicking the
Up to two I/O master stations can be set for one network (block 1 and block 2), regardless of the status of control or normal
station.
CHAPTER 6 PARAMETER SETTING
button will set the station as I/O master station.
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