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6.12 Writing in Program during CPU Module RUN
6.12.3 Precautions for online change
6
FUNCTIONS
(4) Precautions for using Universal model QCPU
(a) Write to program memory during online change or TC setting value change
Contents changed during online change or TC setting value change are
transferred to the program memory automatically at the same time as data is
written to the program cache memory.
The time required for writing data during RUN and changing T/C setting value is
prolonged due to automatic transfer of data to a program memory by the time
shown in Table 6.26.
Ts: Scan time (s)
In addition, since the number of write to the program memory (Flash ROM) is
limited (up to hundred thousand times), set the automatic transfer of data to the
program memory to be invalid if writing data during RUN or TC setting value
change is executed frequently.
Table6.31 Prolonged time due to automatic transfer of data to a program memory
CPU model Transfer time
Q02UCPU
Ts 320 + 4.8 (s)
Q03UDCPU, Q04UDHCPU, Q06UDHCPU,
Q03UDECPU, Q04UDEHCPU, Q06UDEHCPU
Ts 260 + 4.7 (s)
Q13UDHCPU, Q13UDEHCPU
Ts 600 + 8.0 (s)
Q26UDHCPU, Q26UDEHCPU
Ts 1100 + 15.0 (s)
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