Precautions When Using The File Transfer Functions - Mitsubishi Electric Melsec Q Series User Manual

5 WHEN USING FILE TRANSFER FUNCTIONS (FTP SERVER)

5.5 Precautions when Using the File Transfer Functions

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The precautions when using the Ethernet module FTP server functions are explained.
(1) Precautions when designing a system which uses file transfer
functions
(a) For the system
When performing file transfers with the system in operation or controlling the
status of the programmable controller, design the system (such as
configuring an interlocking circuit in the sequence program) so that the
safety of the overall system is always maintained.
(b) For external devices
Some of the FTP operation commands on the FTP client (external devices)
supported by the Ethernet module as a FTP server may not operate as
described in this manual, depending on the client side FTP application.
See the manual on the FTP client (external devices), and confirm the
functions and operation methods.
(c) For the Q/LCPU
1) Only files that can be created/generated by the user with a programming
tool can be transferred. (See Section 5.6.2.)
2) Files can be transferred only to the local station Q/LCPU with the
Ethernet module connected.
Designate an access target CPU if the local station's QCPU is configured
in a multiple CPU system.
3) When file read/write is performed by the file transfer functions while
Q/LCPU is running, the Q/LCPU's sequence scan time may take longer
than when using Ethernet module's other functions, and the file
read/write take a few minutes or longer depending on the file size or
sequence scan.
The file read/write processing time may take even longer depending on
various conditions such as the Ethernet line load (line traffic), number of
connections used at the same time (exchange processing which uses
another connection), and the system configuration.
(2) Precautions when starting up the Ethernet module
When the QCPU is write-protected (DIP switch 1 is on), file transfers which
perform write (attribute change, file write, etc.) cannot be performed.
(Excluding the Universal model QCPU.)
MELSEC-Q/L
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