NAiS FP Series User Manual page 229

Communication Function 3 PLC Link Function
Notes
In the description, "stations that have not been added" refers
to stations that are not connected between the No. 1 station
and the largest station number, or stations that are connected
but for which the power supply has not been turned on.
When calculation examples 2 and 3 are compared, the
transmission cycle time is longer if there is one station that
has not been added to the link, and as a result the PLC link
response time is longer.
The SYS1 instruction can be used to minimize the
transmission cycle time even if there is a station or stations
that have not been added to the link.
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FPΣ