Duplicate Net within Hierarchy

Created: August 20, 2022 | Updated: August 20, 2022

In a hierarchical design with the Net Identifier scope set to 'Hierarchical'. Two sub sheets have duplicate net names. These are local to each sheet. I am getting a Duplicate Net Names error.

Starting in Version: 18.0
Up to Version: Current

Solution Details

If in sheet 02 you use a netlabel and the same netlabel is used in sheet 01. Altium detects that the same netlabel is used, but the nets are not connected (by using ports). So you have two nets on your PCB with the exact same name. Altium considers this a potential problem and will warn you about it.

Error.png 
If the two local nets on the different sub sheets have same name and are not intended to connect, you can append sheet numbers to the Local Nets, done through: Project ► Project Options ► Options tab ► Netlist Options ► Enable Append Sheet Number to Local Nets.

Append.png

Or alternatively, you can rename one of the nets so they are unique. 

If you do want these two nets to have the same name in your PCB, you can set the report mode to 'no report' in the Project ► Project Options ► Error reports ► Violations Associated with Nets ► Find: Duplicate Nets. Then set report mode to 'no report'

No Report.png


Here is documentation which goes into greater detail:
https://www.altium.com/documentation/altium-designer/creating-circuit-connectivity-schematics
 

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