FAQ: What does the compiler message "Internal Error: Overflow. (Specific Code Generator)" mean and what is the remedy?
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In a similar fashion, this error can also occur when a variable is used as a VAR_IN_OUT for a function block inside a user created function block, but isn't declared as a VAR_IN_OUT to the user created function block.
Check the datatype definition for each function block recently added to the project by right clicking on it to view the object properties. Compare the VAR_IN_OUT datatype requirements with the variable attached and correct any mistakes.
Another potential cause is unconnected EN inputs to basic functions.
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