The UltraFLEXplus scan fail data logging performance has been optimized for producing data in STDF format using the STDF V4-2007.1 scan extension in a high throughput production environment. The major EDA vendors can directly extract the required information for their diagnostic tools from STDF. However, when doing Engineering debug there may be times where the preferred workflow and output format is an ASCII-based fail log file directly written from IG-XL. ScanFalcon is an IG-XL Custom Data Consumer which can utilize the same data packets used to create the STDF output file and transform that packet content into an ASCII fail log. It supports creating output in formats compatible with major EDA vendor tools or allows the user to customize the ASCII content via custom format definition files. While there is a slight throughput impact, ScanFalcon can take full advantage of the optimized hardware fail data transfer and the bulk of the processing is done outside the main IG-XL process. This paper will describe ScanFalcon, how to use it in IG-XL programs, provide an overview of its customization capabilities.