Precautions - Mitsubishi Electric Q03UDVCPU User Manual

9.5

Precautions

(1) FTP clients
• Some FTP clients may have FTP command specifications different from those described in this manual. In
such a case, check the functions and operation methods, referring to the manuals for the FTP client.
• An FTP operation from Microsoft
Internet Explorer.
(2) CPU module side processing
• Files only in the drives of the host station CPU module can be accessed.
• Files may be in failure. Stop accessing the memory card or SD memory card before turning off the power
supply, resetting the module, or unloading the memory card or SD memory card. By using SM606 (SD
memory card forced disable instruction), accesses to the SD memory card can be disabled at a time. For
details on the SD memory card forced disable instruction, refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
• During file access, do not operate the file from a peripheral such as a programming tool. (Also do not
perform online operations such as online change, scam time measurement, registration of the step number
set for a monitoring condition). If the file is operated during operation of the FTP function, an error may occur
in the peripheral. Perform the processing suspended due to an error again after performing the FTP function.
• An error will occur if an FTP client tries to connect while the backup or restoration using a memory card is
being performed for the CPU module change function. Execute the connection again after the end of the
backup or restoration. An error will also occur if the backup or restoration is performed while an FTP client is
being connected. Execute the backup or restoration again after disconnecting the FTP client.
(3) Communication processing
• If a timeout error occurs during file transfer, the TCP connection will be closed (disconnected). To restart the
file transfer, log in to the CPU module once again from the FTP client.
• For each FTP connection, the existence of the target device is checked. For details, refer to:
Section 3.6
• The processing time for file transfer depends on the factors such as the Ethernet line congestion, the
number of connections simultaneously used (communication processing of other connections), and the
system configuration.
• Only one FTP client can log in to a CPU module at the same time. If another FTP client attempts to connect
to a CPU module that is already in the logged-in state, the connection cannot be established, resulting in an
error.
• An attempt to execute another communication (MELSOFT connection or MC protocol) using UDP during file
transfer using FTP may cause an error such as a timeout error.
Execute it after completion of the file transfer, or use TCP.
®
Internet Explorer is not allowed. If it is attempted, an error will occur in
CHAPTER 9 FILE TRANSFER FUNCTION (FTP)
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