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How can I join 3 variables to one object without using scripting, in Vijeo Designer?

You can join the 3 variables using a string display object and in the expression editor using the following syntax: Tag1 + Tag2 + Tag3

Where Tag1, Tag2, Tag3 are variable names.
 
If you want spacing between the values being displayed, then you will need to add " " between each tag.  For example: Tag1 + " " + Tag2 + " " + Tag3

This will work with any data type variables (integer, real, string).  But keep in mind that if you use this feature, you will not have input mode.
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