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Bus number allocation in project imported into Unity Pro.

A Proworx 32 project, for example, has an IO map configured with an NOM, two NOEs and an RIO module.
PLC (DIO 1) = Slot 2
NOM (DIO 2) = Slot 4
NOE(1) = Slot 5
NOE(2) = Slot 10
CRP = Slot 16

Once the project is imported into Unity Pro, the Configuration as below in the the Unity Project Browser.

Local Bus = Bus 1
DIO Bus = Bus 2
RIO Bus = Bus 5

Here is how these numbers are assigned and why there are only 3 Buses.
The numbers are assigned in sequence for network interfaces.
The only buses that are shown in the configuration are Local, DIO configured for Peer Cop, and RIO.

Bus 1 is assigned to the CPU in slot 2,
Bus 2 is assigned to the NOM in slot 4 because it is configured for Peer Cop,
Bus 5 is assigned to the CRP RI/O head located in slot 16.

Bus 3 and 4 that are not seen because they are allocated to the NOE's in slots 5 and 10.

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