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The contents of the Value are interpreted as number (decimal or integer) with the entered value being added to the Variable.
Reset to Zero After
You can use this option to 'roll the value' over if you are incrementing a variable and you want to reset it back to zero after it reaches a defined value.
Max Value
if 'Rest to Zero After' is enabled then if the increment causes the variable to exceed this value, then the variable we be reset to zero.