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6.12.3 Precautions for online change
The following shows precautions for online change.
(1) Online change during boot operation
When data are written to the CPU module in the RUN status during boot operation, the status of boot source
program is not changed.
(2) Operations prohibited when programs are written to the CPU module in the
RUN status, T/C setting value is changed, or data are transferred from a
program cache memory to a program memory
Do not perform the following operations.
(a) Power-off or reset
The following operations are not normally completed if they are performed during online change, TC setting
value change, or data transfer from the program cache memory to the program memory.
If performed, write the data to the CPU module again.
• Power-off
• Reset
(b) Operations from GX Developer
The following operations cannot be performed during online change, TC setting value change, or data transfer
from the program cache memory to the program memory. If performed, an error is displayed on GX Developer.
Perform the following operations after online change, TC setting value change, or data transfer from the
program cache memory to the program memory.
(Ladder mode, writing files during RUN, and function block)
TC setting value change
Data transfer to the program memory
• Online change (ladder mode), online change (files)
• TC setting value change
• Data transfer to the program memory
• Write to PLC (Flash ROM)
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