Mitsubishi Electric MELSEC iQ-R C R12CCPU-V, User Manual

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6 Ethernet COMMUNICATION FUNCTIONS
6.3 FTP Function
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6
6.3
FTP Function
The server function of FTP (File Transfer Protocol), which is a protocol used to transfer a file for a target device, is supported.
A target device with the FTP client function can access the file in a C Controller module.
File operation
The following operations can be performed for a file in a C Controller module from a target device with the FTP client function.
■
Reading files (Download)
Use this when storing a file in a C Controller module on the target device side.
■
Writing files (Upload)
Use this when registering a file stored on the target device side to a C Controller module.
■
Browsing and deleting files and folders
Use this when browsing and deleting a file and folder in a C Controller module from the target device side.
Using FTP function
For using the FTP function, the FTP server needs to be set.
 Page 121 FTP server settings
Precautions
■
Specifications of FTP client
For the specifications of the FTP client installed on the target device, refer to the manual of the target device.
■ Operation while accessing file
Do not perform any of the following operations while accessing a file. The file may be corrupted.
• Reset the C Controller module or turn the power OFF.
• Insert/remove an SD memory card.
■
Reconnection after timeout
If a timeout error occurs during file transfer, the TCP connection will be closed (disconnected).
Log in to the C Controller module again with the FTP client before restarting the file transfer.
■
File transmission time
The file transfer processing time will differ depending on the following causes.
• Load rate of Ethernet line (line congestion)
• Number of connections to be used simultaneously (processing of other connections)
• System configuration
■
Number of simultaneous connections
• Up to 10 target devices (FTP client) can log in to a C Controller module. If connecting from the 11th FTP client in the state
where 10 target devices have logged in, an error will occur without establishing the connection.
• If UDP communication is performed during file transfer with FTP, an error such as timeout may occur. Either communicate
after the file transfer or communicate with TCP.
■
File write
• Files with the read-only attribute and files that are locked from other devices/functions cannot be written. Doing so may
cause a write error.
• The write files cannot be transferred if the SD memory card is write-protected. Doing so may cause a write error.
• When writing a large file to the SD memory card, change the CPU operating status to STOP.
■
File deletion
Determine the timing for deleting the files for the entire system including the C Controller module and peripheral devices.