Mitsubishi Electric MELSEC iQ-R Series User Manual page 97

Resend function
A file resend is attempted every 10 seconds when a module cannot access the file server and the file transfer is failed due to
a network failure.
File transfer data 4
File transfer data 1
File transfer data 2
File transfer data 3
Logging file
Resend buffer
SD memory card
File transfer data 1
File transfer data 2
File transfer data 3
Logging file
File transfer data 4
Resend buffer
SD memory card
When the resend function is set to enabled, the information required for this function will be saved to the SD memory card.
Therefore, the free space in the SD memory card is reduced depending on the number of specified data.
In addition, if the power of a module is turned OFF during network disconnection with a file server, a file resend is performed
when the access to the file server is restored and the power of the module is turned ON.
Precautions
• When resend function is 'enabled', a file transfer error will not occur even if transfer fails without accessing the server.
However, even when the resend function is enabled, if transfer fails and a processing error occurs on the server side due to
issues like server overload, a file transfer error will occur similar to when the resend function is disabled.
• When the files to be transferred are deleted while resending, the no transfer file error occurs. Set a sufficiently large number
of saved files for logging files and report files so that the resend source files are not deleted.
• When the resend target number exceeds the number specified to the resend buffer size, the resend buffer excess error
occurs. After the occurrence of the error, the file that failed to transfer is not newly added to the resend buffer, and it does
not become the resend target. Specify a sufficiently large resend buffer size. (Page 136 File transfer setting)
• The usage rate of the resend buffer memory can be checked, and the buffer can be cleared in Configuration Tool.
(Page 219 File transfer diagnostics)
And, the resend buffer will be cleared when settings are written, the CPU module is reset or if the settings are updated.
• Even if the file transfer test fails, the file will not be resent.
• A transfer by the resend function is performed per file. Therefore, when the transfer function is performed during a file
resend, a transfer by the transfer function is performed even if all the file resend of logging files and report files is not
completed. If the transfers by the transfer function and the resend function occur at the same time, they are performed
randomly.
Disconnection
File server (FTP server, shared folder)
Recover
Logging file
File server (FTP server, shared folder)
Specify a logging file to be
transferred from the File
transfer data, and resend it.
1 FUNCTION
1.9 File Transfer Function
1
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