NAiS FP Series User Manual page 264

FPΣ 13.4 Table of System Registers
Precautions for system register setting
Sytem register settings are effective from the time they are set.
However, MEWNET- W0 PLC link settings, input settings, tool and COM. ports
communication settings become effective when the mode is changed from PROG. to
RUN. With regard to the modem connection setting, when the power is turned off and
on or when the mode is changed from PROG. to RUN, the controller sends a command
to the modem which enables it for reception.
When the initialized operation is performed, all set system register values (parameters)
will be initialized.
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