In the image you posted, you said you want to return an int using the name of your FC.

Just assign the return value to the name of your FC and end your FC.

It does not work like PC programming languages where you insert "return somevalue".  You assign the value to the name of the block (FB or FC) and end the block gracefully. 

M_Rashed

This might sound silly, but I could not find a way how to return a value from FC in TIA Portal.

I have attached a picture.

You can save a temp tag and an extra statement by doing this:

#block_1test := #input_0 * 10; // or something similar 

M_Rashed

The solution was very simple. I have attached a picture which worked for me. Thank you.

I feel like you are giving me a command.

#dP

Are you ready yet for the secret TIA handshake?