Mitsubishi MELSEC LJ71C24, User Manual

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7 SETTINGS FOR THE C24
(7) Online change
This sets whether or not data transmitted using the MC protocol is written to the
CPU module from an external device while the CPU module is running,
according to the system specifications.
When online change is prohibited (disabled), the data is not written and an NAK
message is returned if the external device requests the CPU module to write data
while it is running.
The available functions differ depending on the setting values when the online
change is enabled.
Check in the "write allow setting" and "write prohibit" columns in the command list
of the MELSEC-Q/L MELSEC Communication Protocol Reference Manual.
(8) Setting modifications
This sets whether or not the following actions are enabled after starting up the
C24.
• Specifications, and the switching mode of each interface
• Writing data to the flash ROM (writing the system setting values and user
frame)