Precautions - Mitsubishi MELSEC L Series User Manual

8.5

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.
• During file access, do not power off the CPU module, reset the CPU module, or remove an SD memory card.
Doing so may corrupt the file. Stop accessing to an SD memory card, and then power off the CPU module,
reset the CPU module, or remove an SD memory card. All of SD memory card operations can be disabled
by SM606 (SD memory card forced disable instruction). For the forced disablement of SD card, refer to the
following.
MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance and Inspection)
• During file access, do not perform any file operation from a peripheral device such as a programming tool.
When a file is operated from a peripheral during FTP function operation, an error may occur on the
peripheral device.
• During online change, do not perform any file operation using the FTP function. Doing so may cause an
error.
• While accessing a file by the FTP function, do not perform any online operation from a peripheral device
such as a programming tool. Doing so may cause an error on the peripheral device.
• If an access is attempted from an FTP client during backup or restoration for the CPU module change
function using an SD memory card, an error will occur.
Reexecute it after completion of the backup or restoration.
An error will also occur if backup or restoration is performed during access from an FTP client.
In that case, reexecute it 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 3.5
• 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.
CHAPTER 8 FILE TRANSFER FUNCTION (FTP)
Internet Explorer is not allowed. If it is attempted, an error will occur in
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