Mitsubishi Electric melsec q00ujcpu User Manual page 218

(4) Writing to the program memory during online change and T/C setting value
change
Contents changed due to online change and TC setting value change are automatically transferred to the
program memory simultaneously when the data are written to the program cache memory.
The time required for writing data to the CPU module in the RUN status and changing T/C setting value is
increased due to automatic transfer of the program memory by the time shown in Table6.21.
Table6.21 Time increased due to automatic transfer of data to the program memory
Q00UJCPU,Q00UCPU,Q01UCPU,Q02UCPU
Q03UDCPU,Q04UDHCPU,Q06UDHCPU,Q03UDECPU,
Q04UDEHCPU,Q06UDEHCPU
Q10UDHCPU,Q10UDEHCPU
Q13UDHCPU,Q13UDEHCPU
Q20UDHCPU,Q20UDEHCPU
Q26UDHCPU,Q26UDEHCPU
Since the number of writes to the program memory (Flash ROM) is limited (up to 100,000 times), set the
automatic transfer to the program memory to be disabled when data are written to the CPU module in the RUN
status and changing T/C setting value frequently.
CPU module
CHAPTER6 FUNCTIONS
Transfer time
Ts 320 + 4.8 (s)
Ts 260 + 4.7 (s)
Ts 439 + 6.2 (s)
Ts 600 + 8.0 (s)
Ts 839 + 11.4 (s)
Ts 1100 + 15.0 (s)
Ts: Scan time (s)
6 - 67
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