Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 208)

Chapter 8: Fixed File Operations PC NC Maintenance Manual
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10. The dialog box indicates when the backup process is complete. At
this point, select the Close button.
11. When the All option is selected, PC NC creates four files, shown
in the file list at the bottom right. These files all have the same
filename, but with different extensions that indicate the file type.
File extension Meaning
.prm all parameters
.mac macro and common variables
.tld tool data and workshift values
.hsc high speed cutting data