Electrical – Altium – Handling Multiple net names for buses

I would use Net Labels to connect buses together. Ports are mostly used when connecting nets from different sheets.

As The Photon says, the 8 signals from the left IC must have the same net label as the 8 signals from the right IC.

Your bus connection should look like this:

Buses are used to graphically represent how a group of related signals, such as a data bus, is connected on a sheet. They are also used to collect together all the signals belonging to a bus on a sheet and connecting them to a port to enter or leave a sheet. In this instance, they must have a net label of this format: D[0..7].

When it comes to buses, the only way to establish connectivity between a bus and the individual lines within it, is through logical connectivity between net labels. The use of bus wires and bus taps is merely a visual aid. Connectivity will be establish regardless of whether they are present or not.

For more information about buses:

• Connectivity and Multi-Sheet Design
• Altium Training Video: What is the best way for me to wire up my schematics?, video #2

Can you post your sub-sheets?

From looking at what you have posted, I think you may have a typo in the entry: RB[0..7]. You typically get the red line below the entry when it is not correctly tied to a port on the child-sheet.

Right-click on the sheet symbol, and select "Sheet Symbol Actions" -> "Synchronize Sheet Entries and Ports"

Anyways,

I created a simple, minimal test schematic to do what you are doing:

Top Sheet:
Sheet 1:

Sheet 2:

Project Hierarchy:

And it properly connected the nets across the different schematics:

For what it's worth, I am fairly sure you have to both name the buses with net-labels on each child-sheet, and name the ports.
Also, the bus name and wire names have to have the same prefix:
For example, a set of wires HERP0 HERP1 HERP2 HERP3 HERP4 has to be in a bus named HERP[0..4]. It may also have to be zero-indexed (i.e. start at 0, rather then 1), but I'm not totally positive on that.

Also, I do indeed get the "Net NetName has multiple names" warning, but it's just that, a warning. You can turn the warning off, or just ignore it. I tend to leave it on, and before I have a board produces, go through all the warnings and make sure that I intend for whatever they refer to to be that way.