Mitsubishi Q00CPU, Руководство пользователя

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7
- 42 7.6 File Transfer Function (FTP)
7
COMMUNICATION USING BUILT-IN ETHERNET
PORTS OF CPU MODULE
(6) Precautions
Precautions for using the file transfer function are described below.
(a) FTP clients
• FTP command specifications may differ from those described in this manual,
depending on the FTP client. In such a case, check the functions and
operation methods, referring to the manuals on the FTP client side.
• FTP operations cannot be performed from Microsoft Internet Explorer. If
performed, an error occurs with Internet Explorer.
(b) Processing in Built-in Ethernet port QCPU
• Files only in the drives of the host station Built-in Ethernet port QCPU can be
accessed.
• During file access, do not turn OFF the power supply, reset the CPU module
or install/remove a memory card. If any of these operations are performed,
files may corrupt.
• During file access, do not perform any file operations from peripherals such
as GX Developer. When a file operation is performed from another peripheral
during FTP function operation, an error may occur on the peripheral side.
• During online change, do not perform any file operations using the FTP
function. When a file operation is performed, an error may occur.
• During file access using the FTP function, do not perform any online
operations from peripherals such as GX Developer. When an online
operation is performed, an error may occur on the peripheral side.
(c) Communication processing
• When a time-out error occurs during file transfer, the TCP connection will be
closed (disconnected). To restart the file transfer, log in to the Built-in
Ethernet port QCPU once again from an FTP client.
• In a communication using FTP connections, an existence check of external
devices is performed. For operation details, refer to Section 7.2 (3).
• The file transfer processing time depends on the following factors.
1) Load rate of the Ethernet line (line traffic)
2) Number of connections simultaneously used
(communication processing of other connections)
3) System configuration
• The number of external devices (FTP clients) that can be simultaneously
logged in to the Built-in Ethernet port QCPU is only one. When another FTP
client attempts the connection to the Built-in Ethernet port QCPU which is in
the logged-in status, connection cannot be established and an error occurs.
• If the File transfer function using the FTP is executed simultaneously with
other communication functions (MELSOFT connection, MC protocol) using
the UDP, an error, such as a time-out error, may occur. Execute other
communication functions after file transfer is completed or communicate
using the TCP.