Mitsubishi Electric MELSEC Q Series User Manual page 200

(2) Precautions
(a) FTP client specifications
For FTP client specifications implemented in destination device(s), refer to the manuals for the respective
destination device(s).
(b) Operations during file access
During file access, do not power OFF or reset the system, or insert/remove the memory card.
Doing so may corrupt files.
(c) Reconnection in the event of timeout
If any timeout error occurs in file transfer, the TCP connection is closed (disconnected).
To resume file transfer, login the C Controller module by the FTP client again.
(d) File transfer time
File transfer processing time varies depending on the following factors:
• Ethernet line contribution percentage (line busyness)
• Number of simultaneous connections (communication processing for other connections)
• System configuration
(e) Number of simultaneous connections
The number of destination devices (FTP clients) allowed to login to the C Controller module is 10.
In case of connection from the other FTP client(s) in login status, connection fails and an error is generated.
If UDP communication is established during FTP file transfer, errors such as timeout may occur.
Establish communication after file transfer, or by TCP.
(f) File writing
Files with read-only file attribute or locked by other models/function may not be written.
Any write attempt cause a writing error.
If the memory card is write protect, file transfer involving writing is not allowed. Any write attempt cause a
writing error.
To write any large file, change the CPU operation status to STOP in advance.
(g) File deletion
Determine the timing to delete files in view of the entire system including the C Controller module and
peripherals.
(h) If you forgot FTP password
If you forgot your FTP password, initialize the C Controller module.
Initialization restore the factory account settings of the system. For details, refer to the following.
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