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Goals and Symptoms
When the EN input of a function block goes low Unity is designed to zero-out the outputs of blocks where links are attached, or maintain the last value if a variable is attached. Former users of Concept will be accustomed to the outputs remaining at their last state irrespective of whether a link or a variable is attached to the output.
Causes and Fixes
In the image below an ADD_INT block is being fed by a link in one example and a variable in another with the EN input high.
When the EN input drops low the link value is set to zero and the variable maintains it's last value.