Mitsubishi Electric Melsec Q Series User Manual page 151

5 WHEN USING FILE TRANSFER FUNCTIONS (FTP SERVER)
MELSEC-Q/L
(3) Attributes
Specify the following when changing the attributes of the file stored in the
Q/LCPU drive to be transferred:
"r" (Read Only) "w" (read/write enabled)
See the "quote change" command in Section 5.6.4.
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