Omron CRT1 - 10-2008 Operation Manual page 469

Analog I/O Slave Unit Functions
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5. When user scaling is selected, set the 0% value in the Scaling Point (0%)
Field, and set the 100% value in the Scaling Point (100%) Field.
6. For offset compensation, set the offset value in the Scaling Offset Field.
Also select either Default Scaling or User Scaling in the Scaling Type
Field.
Section 11-4