Precautions - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

5.3

Precautions

This section describes the precautions on writing data to the CPU module.
Prohibited operation (Turning off or resetting the CPU modules)
• When writing data to the programmable controller or executing the online change (ladder block), do not turn off or reset the
CPU module. Otherwise, the operation does not complete successfully. If doing so, write the data to the programmable
controller again.
• Do not power off and on or reset the CPU module when the program memory transfer is not completed. Otherwise, a stop
error occurs.
Operation from engineering tools
■Operations cannot be executed simultaneously
The file batch online change or online change (ladder block) cannot be executed simultaneously with the following operations
from the engineering tool.
• Write to the programmable controller (excluding device, local device, global label, or local label data).
• File batch online change or online change (ladder block)
• Memory initialization
■Writing during the program memory transfer
When the program memory transfer starts during writing to the programmable controller or the online change from an
engineering tool, writing to the programmable controller or the online change from another engineering tool can be executed.
However, if this operation is performed, the progress of the ongoing transfer is reset to 0%. The transfer progress which is
reset to 0% resumes when the program memory transfer from another engineering tool starts.
Engineering tool 1
5 WRITING DATA TO THE CPU MODULE
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5.3 Precautions
Engineering tool 2

Description
The program memory transfer from the
engineering tool 1 starts.
Writing from the engineering tool 2 starts during the
transfer from the engineering tool 1.
The progress of the transfer from the engineering
tool 1 is reset to 0%.
When the program memory transfer from the
engineering tool 2 starts, the transfer from the
engineering tool 1 progresses as well.