Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 402

Set the input type (other than conversion disable) to be used in "Input type/Range setting" and "Setting Input
type/range (Offset/gain setting)" to the user range setting in advance.
3 FX5-8AD
400
3.8 Offset/Gain Setting
4.
Mark the checkbox of the channel where offset and gain
values are to be set.
5.
Select voltage or current and click the [Offset Setting]
button.
6.
Apply the offset voltage or current to the corresponding
channel, and click the [Yes] button.
7.
Check that "Offset Status" has changed to "Changed",
and click the [Gain Setting] button.