Mitsubishi LJ61BT11 User Manual page 182

(1) Precautions for setting the remote I/O station points
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[Setting method]
Using GX Works2, make setting by choosing "Station Information Setting" -
"Remote Station Points" in the Network Parameter dialog box. (Refer to
Section 7.3.2)
The number of parameter-set remote I/O station points should be equal to or
greater than the number of I/O points of the mounted remote I/O stations. If it is
less than the number of I/O points of the mounted remote I/O stations, the
inputs/outputs after the set number of points will not operate normally.
8 FUNCTIONS
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