Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 406

When the input type is "resistance temperature detector" or "thermocouple", offset value - gain value > 0.1
Precautions
If a broken wire is detected while setting the offset and gain, the offset and gain channel change error (error code: 1EBH)
will occur. The channel where the error occurred will remain unadjusted, so set the offset and gain again after repairing the
broken wire.
3 FX5-8AD
404
3.8 Offset/Gain Setting
12.
Check that "Gain Status" has changed to "Changed",
and click [Close] button.
13.
Click [Yes] button.