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Explanation of why the output of a Unity Pro instruction will be zero after the EN input of the block goes low.

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.

NOTE: There is a a Project Setting in Unity which will maintain the output state of an EF when EN goes low. By default this setting is not selected.
To maintain the output state of a disabled EF go to Tools/Project Settings/Program/Language Common. Select "Maintain Output Links on Disabled EF or EN=0"
Selecting this option will negate the manner of operation described in this FAQ.

Causes and Fixes


Function Block


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.

task

When the EN input drops low the link value is set to zero and the variable maintains it's last value.

task



There is a a Project Setting in Unity which will maintain the output state of an EF when EN goes low. By default this setting is not selected.
To maintain the output state of a disabled EF go to Tools/Project Settings/Program/Language Common. Select "Maintain Output Links on Disabled EF or EN=0"

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