FTPLOGON "my_ftp_site.com" /timeout=60 
IFERROR RETURN
SET ten_min_ago = %datetime
DATETIMESUB ten_min_ago 10 /minute 
:loop
FTPGETFILE "*.txt" /newest 
IFERROR RETURN $ERROR_SUCCESS  
IFDATETIME< %sitefiledatetime ten_min_ago RETURN  $ERROR_SUCCESS
;; File has been modified within last 10 minutes, so download it
RCVFILE %sitefile 
IFERROR RETURN 
GOTO loop