A global net has a name that remains constant no matter where it is placed in a design's hierarchy. A net is global when it is attached to a global connector. Once a net is named with a global connector, that net is available throughout the design, on all pages, subcircuits and hierarchical blocks.

A net cannot be renamed if a global connector is attached to it. You must rename the global connector. When you do this, the net name changes throughout the design to match the global connector name.

Analog ground (net 0) is the only pre-defined global net. It cannot be renamed if an analog ground connector is attached to it. The analog ground connector is the only global connector that cannot be renamed.

Digital sources, for example, VCC, and digital ground are also global connectors. These can be renamed as desired. When a wire is attached to such a connector, its net name is automatically changed to the name of the connector.

For example, in the figure below, VCC was placed and then renamed to power by double-clicking on the connector and changing the RefDes (1) to power. The net name automatically changed to power (2) to match the new component RefDes.