Omron GRT1 - 11-2007 Operation Manual page 149

Analog Input Units
128
4. Select the tab page for the input where the comparator function is to be set,
and select the Comparator Check Box in the Function Choice Area.
5. Click the Comparator Tab and set each of the alarm values. The example
here shows the setting for Alarm Trip Point High (HH).
Section 5-4