Omron FH-3 Series Reference Manual page 628

Using Values of Other Expressions
Up to 8 expressions can be set in 1 expression unit.
The value of other expressions set within the same unit can also be used.
Since expression results obtained by the expression are displayed as D00 to D07 and judgement results of
expression are displayed as J00 to J07, this is set to "U3.D00" (results of expression 0 set for processing item
[Calculation] of unit number "3") using "unit number calculation results".
For the following scene settings:
Example 1: Calculate the reference position distance and measurement results distance for the
edge position and output the difference between the two.
Area of Unit 1
Area of Unit 2
Substitute the operational results of Expression 0 (DO0) and Expression 1 (DO1)
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Calculation FH/FZ5 Processing Item Function Reference Manual