Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 449

Temperature Input Terminals
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2. Select the Tab Page for the input where the cumulative counter is to be set,
and select Cumulated Count under the Function Choice heading.
3. To set the counter unit, click the Cumulated Count Tab and select Hour
or Minute from the pull-down menu in the Cumulated Timer field.
Section 7-6