Mitsubishi Electric QD75P1N User Manual page 664

14 DEDICATED INSTRUCTIONS
(3) Writing to the flash ROM can be executed up to 100,000 times.
If writing to the flash ROM exceeds 100,000 times, the writing may become
impossible.
(4) After the power ON and CPU module reset operation, writing to the flash ROM
using a sequence program is limited to up to 25 times. (Not limited to up to 25
times when writing to the flash ROM is carried out by peripheral device.)
If the 26th or more writing is requested after the power ON/CPU module reset
operation, an error "flash ROM write number error" (error code: 805) will occur,
and the writing will be disabled. If a flash ROM write error occurs by one writing to
the flash ROM, check and correct the flash ROM writing program. Then reset the
error or turn ON the power and reset the CPU module again.
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MELSEC-Q