Mitsubishi Electric MELSEC-Q Series User Manual page 201

10 DEVICES
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(2) Precautions for use of file registers
Performing write/read to/from 32k or more points of file register numbers will not
result in an error.
However, note that performing read from file registers will store indefinite data.
(3) File register deletion
File registers can be deleted by performing online PLC data deletion.
MELSEC-Q
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