Mitsubishi Electric MELSEC-Q Series User Manual page 368

(6) Writing the flash ROM by a PLC CPU request (
The following transmission process is carried out by setting "1" in "[Cd.1] Flash
ROM write request".
1) The "parameters", "positioning data (No. 1 to 600)", "block start data (No.
7000 to 7004)" and "servo parameter (MR-J4-B use)" in the buffer
memory/internal memory area are transmitted to the flash ROM/internal
memory (nonvolatile).
(7) Writing the flash ROM by a GX Works2 request (
The following transmission processes are carried out with the [flash ROM write
request] from the GX Works2.
1) The "parameters", "positioning data (No. 1 to 600)", "block start data (No.
7000 to 7004)" and "servo parameter (MR-J4-B use)" in the buffer
memory/internal memory area are transmitted to the flash ROM/internal
memory (nonvolatile).
Note) This transmission process is the same as (6) above.
IMPORTANT
(1) Do not turn the power OFF or reset the PLC CPU while writing to the flash
ROM. If the power is turned OFF or the PLC CPU is reset to forcibly end the
process, the data backed up in the flash ROM/internal memory (nonvolatile) will
be lost.
(2) Do not write the data to the buffer memory/internal memory before writing to the
flash ROM is completed.
(3) The number of writes to the flash ROM with the sequence program is 25 max.
while the power is turned ON.
Writing to the flash ROM beyond 25 times will cause the error "Flash ROM write
number error" (error code: 805).
Refer to Section 16.4 "List of errors" for details.
(4) Monitoring is the number of writes to the flash ROM after power supply ON by
the "[Md.19] Number of write accesses to flash ROM".
Chapter 7 Memory Configuration and Data Process
7 - 10
)
)