KB: Multi-Channel Connectivity with Harness is Not Working
Created: December 10, 2025 | Updated: December 10, 2025
Altium Designer
When using harness connectors in a multi-channel design in Altium, only the first channel may connect successfully while other repeated channels fail to connect. This issue typically occurs due to inconsistent harness entry names across channels. To ensure proper connectivity, all repeated channels and their corresponding schematic sheets must use the same harness entry name. Different net labels can be applied, but the harness entry name must remain identical for all channels.
Solution Details
Problem Description
In multi-channel designs with parametric repeats using harness connectors, only the first channel may connect correctly, leaving other repeated channels disconnected. This disrupts signal flow and prevents proper design validation.
Root Cause
- Harness entry names differ between repeated channels.
- Altium requires identical harness entry names for all channels to establish connectivity.
- Net labels do not affect connectivity, but mismatched harness entry names do.
Resolution
To resolve the issue:
- Use the same harness entry name for all repeated channels and their schematic sheets.
- You may use different net labels for each channel, but the harness entry name must remain consistent.
Step-by-Step Instructions
- Open the schematic sheet containing the repeated channels.
- Check the harness entry names for each channel.
- Update the harness entry names so they match across all channels.
- Verify connectivity after making changes.
Additional Notes
- Consistency in harness entry names is critical for multi-channel designs.
- Different net labels are acceptable and will not affect connectivity as long as harness entry names match.