Omron sysmac NX102-9 Series Owner's Manual page 389

11 FTP Server
 Restrictions on Connection to FTP Server
If you repeat connection to and disconnection from the FTP server frequently in a short period of
time, your access may be restricted temporarily to protect the system. If you cannot connect to the
FTP server, wait for 10 minutes and try again.
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NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)