# Unidirectional propagation qualifier

Canonical URL: https://eloragrid.ai/symbols/iec-unidirectional-propagation-qualifier
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: Q020501
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Unidirectional propagation qualifier
Autodesk IEC-60617 Symbol Preview — Propagation and signal-flow qualifiers; vendor family reference, not certified IEC geometry or database identifier.

This qualifier indicates a signal or propagation path with one documented direction.

## What it represents

This qualifier indicates a signal or propagation path with one documented direction. The flow is an information or signal relationship, rather than necessarily a conductive power path. A sending element and receiving element can each need separate auxiliary supplies.
Label the signal and interface at each end. Keep supply conductors and signal-direction annotations visually distinct when both appear in the same diagram.

## How to read it

- Identify the source, destination and signal type in the surrounding diagram.
- Signal direction must not be confused with the direction of power flow.

## Information to show or reference

- Identify the associated device, circuit or diagram boundary.
- Identify the source, destination and signal type in the surrounding diagram.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

## Important distinction

Signal direction must not be confused with the direction of power flow.

## Facts

- Reference scope: Specific public IEC-context family form
- Publisher reference token: Q020501 (Autodesk token; not a verified IEC database ID)
- Information added: Identify the source, destination and signal type in the surrounding diagram.
- Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic

## Public references

- [Autodesk IEC-60617 preview: Propagation and signal-flow qualifiers](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1C0C7AE2-F703-4283-BCB1-3E0B30882715.htm) — Autodesk. Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.