Mitsubishi 00JCPU User Manual page 159

(c) Time required for "Write to PLC (Flash ROM)"
Using "Write to PLC (Flash ROM)" writes data to the entire space in the Flash card.
Therefore, even if a program having the small number of steps is written to the Flash card, the processing
takes time.
(Writing using the Q2MEM-4MBF at a communication speed of 115.2Kbps with an RS-232 interface requires
14 minutes.)
When writing data to the Flash card, increase the transmission speed or use an USB.
Communication time takes time when "Write to PLC (Flash ROM)" is executed from another station.
(d)
Online change
If "Write to PLC (Flash ROM)" is executed during the RUN status in the situations described below, an error
may occur and the CPU module may stop. To avoid this, execute "Write to PLC (Flash ROM)" after setting the
RUN/STOP/RESET switch to STOP.
1) File registers stored in the Flash card are used in the sequence program, or
2) although "Not used" is set to the file registers by the PLC parameter dialog box, they are used in the
sequence program.
(e) Writing/reading data during execution of "Write to PLC (Flash ROM)"
While "Write to PLC (Flash ROM)" is executed, data cannot be read from/written to other modules.
Therefore, time-out may occur in other modules.
(f) When "Write to PLC (Flash ROM)" is executed during the STOP status
Do not set the RUN/STOP/RESET switch to RUN during the writing.
The CPU module may not enter the RUN status normally during execution of "
Set the RUN/STOP/RESET switch to RUN after the writing.
CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
Write to PLC (Flash ROM)
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