NAiS FP Series User Manual page 209

Communication Function 3 PLC Link Function
Overview of PLC link operation
Link relay: Turning on a link relay contact in one PLC turns on the same link relay
in all of the other PLCs on the same network.
Link register:If the contents of a link register in one PLC are changed, the values of
the same link register are changed in all of the PLCs on the same
network.
Link relay
If the link relay L0 for the unit (No. 1) is turned on, the status change is fed back to the ladder programs of other
units, and the Y0 of the other units is output.
R0
L0
FPΣ
R0
F0, MV, K100, LD0
No. 1 Link register
100
LD 0
Link register
If a constant of 100 is written to the LD0 of unit No. 1, the contents of LD0 in unit No. 2 are also changed to a
constant of 100.
Figure 202: FPΣ Overview of PLC link operation
10 - 4
Y0
L0
FPΣ
RS485
No. 2 Link register
LD 0 100
Y0
L0
FPΣ
No. 3 Link register
LD 0 100
FPΣ
Y0
L0
FPΣ
No. 4 Link register
LD 0 100