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Combining aliases

Hi,

I am trying to combine/concatenate two aliases. This seems to work in an expression:

 

You can see that the value is being correctly referenced and read. The problem is that the block has a "Readback failed" error and the status of its output is NoCommNUV.

Also, this path, if used in an External reference, does not give a value at all.

Could you tell me why this is? Do you have experience using more than one alias in one path?

Thank you,

 

Istvan