The data type of the variant is not compatible with the data type wired to the type input.

Question

Hello all..
Iam curently struggling with the following:
On my main(top)_VI, I have a mix-signal graph which will output several or one signals depending on the user. I also have an inner subvi which has the analisys i want to give the the data before outputing it to the main(top) VI, which has the mix-signal graph control.
Now, I created a reference from the mix-signal graph and Iam imputing this reference into the subVI (which inside has a property node type_control_mix-signal graph in which Iam connecting the refnum from the top VI to view the output data). The data consists of an array of clusters of 2 arrays of doubles each.
-- let say I create the property node type control mix-signal graph and i choose value property; it lets me put the array of clusters of 2 arrays of doubles each without problems; Now the second I connect the refnum pointing to the mix-signal graph on the Main_VI it brakes the cables and only accepts one cluster of two arrays os doubles instead.
--if on the other hand I connect the refnum to the property node type_control_mix-signal graph before connecting the imput it doesnt complain until I run the VI where it gives the error 91.
I have also notices a (strict) parenthisis at the end of the property node sometimes. [what does this (strict) means?]
FInally if instead of creating the refnum from the Main_VI, I create either a xy graph or a mix-signal praph it lets me connect the an array of clusters of 2 arrays of doubles each without any problem. The refnum connection seems to be the problematic factor, but  by the same tolken I dont know any other means of sending that data from the inner to the outter VI.
I have the feeling Iam missing on one or more Labview fundamentals regarding refnums.
Any help will be apreciated

Answer 1

You almost found it on your own. The refnum needs to be 'strict', that means that the data type of the graph is set (2D dbl), otherwise it will use the default data type. To do this you create the refnum directly from the graph after you have wired the correct data type to the terminal. In this case the refnum wire will break if you change the data type of the graph.
Independend of this issue, I suggest you not to use the value property on the graph but directly wire the data (e.g. the 2D double) to the SubVI. The property value is by far the slowest way to get data, and 2D arrays are really some amount of data.
Felix
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