Omron NB-series Operation Manual page 436

3 Functions of NB-Designer
When the value of index memory is 30, the addresses of NI4 and NI0 are the same.
30
Station Num Index Function
Station number index function is invalid for the background components and Macros.
Only one PLC can be connected with the connection wire, while multiple station numbers can
be set during the editing, thus it is the same effect as the connection with multiple PLCs.
3-394 NB-series Programmable Terminals NB-Designer Operation Manual(V106)