Default value of Ring Constant

[colorimeter]

I am a beginner trying to understand an existing block diagram. The following symbol is a Ring constant, right? When the program runs, the user never gets to select the value. Does that mean its default value is used? When I click on Properties > Edit Items, it lists Value1, Value2, and Value3, but Value1 is checked: is that the default? If I need it to be Value2 instead, do I make sure Value2 is checked on the block diagram, then run the program? 

[altenbach]

This is a diagram constant that is wired to the indicator (not 100% sure, because the wire routing is pretty ugly!). The diagram constant will have whatever value you select at edit time.

A diagram constant can't be changed a runtime. For that, you need to turn it into a control.

[colorimeter]

And in order to select the value at edit time, I make my selection the checked item in the list, right? So Value2 is checked but Value1 and Value3 are unchecked.

[JÞB · Accepted solution]

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@colorimeter wrote:

And in order to select the value at edit time, I make my selection the checked item in the list, right? So Value2 is checked but Value1 and Value3 are unchecked.

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Yes, that is the correct way to set the value of that instance of the ring constant.  The default value is different.  A default value is the value a new instance of the control or constant initially holds when it is created, e.g. 0 for numerics (or 0 +0i), empty string for strings, VOID for Varients etc...  You can change the default value for control instances with the property editor or by creating a type definition.