Need some PCM assistance

[[Br...]]

I am trying to use variables to modify datums on a position characteristic. The characteristic will modify itself based on the requirement of the hole it is measuring. So If I had a position callout of .005 on datums -ABC-, it would update the tolerance and datums accordingly. My question is, how do you input nothing? If I want to assign a value of nothing to the variable, how would I go about doing that? If there is no tertiary datum, I just want to have it left blank.

 

Does anyone know how I might go about doing this?

 

[[Ri...]]

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Blank for a variable is just double quotation marks.

Edited February 6

[[Br...]]

For whatever reason when running simulation, leaving it blank in that way using just the "" causes the characteristic to fail.

[[Ri...]]

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I see that now. 

 

Edited February 7

[[Br...]]

Thank you for the suggestion! Any other ideas of how I could make this happen?

[[Mi...]]

Did you try:

DATC="" // no reference
or
DATC="FeatureName" // reference element
dummy="DATC"

and in the position charateristic you put compute(dummy):

Edited February 7

[[DW...]]

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I don't have PCM, can you use "null"?

[[No...]]

The problem might be that Calypso thinks there is "something" in that field because it still points to a formula/variable (yellow background). But an empty variable is not necessarily the same as an empty field, since both may be processed on different "levels". 

[[Je...]]

Try where you lack a datum reference, use the tolerated feature in place.  Now this will have different impacts on characteristic based DRF vs secondary alignment DRF

[[Mi...]]

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Forget the post above! It doesn't work!

The following worked at least in simulation:

DATC="" // no reference
//---------------------------------------
// if you have a reference element
dummy="FeatureName" 
DATC="dummy"
//---------------------------------------

in characteristic insert compute(DATC) per formula: