{"schemaVersion":1,"slug":"iec-unidirectional-propagation-qualifier","name":"Unidirectional propagation qualifier","kind":"symbol","abbreviation":"Q020501","aliases":["Unidirectional propagation qualifier symbol","Q020501","Unidirectional propagation qualifier IEC reference"],"category":"installation-communications","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"This qualifier indicates a signal or propagation path with one documented direction.","description":["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."],"readingNotes":["Identify the source, destination and signal type in the surrounding diagram.","Signal direction must not be confused with the direction of power flow."],"drawingChecklist":["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."],"distinction":"Signal direction must not be confused with the direction of power flow.","facts":[{"label":"Reference scope","value":"Specific public IEC-context family form"},{"label":"Publisher reference token","value":"Q020501 (Autodesk token; not a verified IEC database ID)"},{"label":"Information added","value":"Identify the source, destination and signal type in the surrounding diagram."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"}],"references":[{"sourceId":"iec-public-propagation","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}],"related":["power-converter","plc-io"],"artwork":"edu-iec-unidirectional-propagation-qualifier","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Unidirectional propagation qualifier","reference":"Autodesk IEC-60617 Symbol Preview — Propagation and signal-flow qualifiers; vendor family reference, not certified IEC geometry or database identifier."},"url":"https://eloragrid.ai/symbols/iec-unidirectional-propagation-qualifier","illustration":{"url":"https://eloragrid.ai/library/illustrations/iec-unidirectional-propagation-qualifier.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"iec-public-propagation","title":"Autodesk IEC-60617 preview: Propagation and signal-flow qualifiers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1C0C7AE2-F703-4283-BCB1-3E0B30882715.htm","type":"cad-reference","scope":"Public publisher IEC-context family names and vendor block references. No vendor images or CAD library files are reproduced, and vendor tokens are not presented as verified IEC database identifiers.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content."}]}