NAiS FP Series User Manual page 214

FPΣ 10.2 Communication Parameter Settings
Notes
To make the unit number setting in the FPWIN GR valid, set
the unit No. setting switch to "0".
If the station number setting switch has been set to 0, the
system register settings and SYS1 instruction setting become
valid.
When using the PLC link function, set the range of unit
numbers as 1 to 16.
Station numbers should be set sequentially and consecutively,
starting from 1, with no breaks between them. If there is a
missing station number, the transmission time will be that
much longer.
If fewer than 16 units are linked, the transmission time can be
shortened by setting the largest station number in system
register no. 47.
Station numbers can also be set using the SYS1 instruction.
The priority order for station number settings is the station
number setting switch > system registers > SYS1 instruction.
10 - 9