PCS
Power converter / inverter
An identified interface converting electrical power between documented circuit forms.
SLD / Schematic
IEC · Q020501
Unidirectional propagation qualifier
This qualifier indicates a signal or propagation path with one documented direction.
IEC · Unidirectional propagation qualifier
Autodesk IEC-60617 Symbol Preview — Propagation and signal-flow qualifiers; vendor family reference, not certified IEC geometry or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · Q020501
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.
A distinction that matters
Signal direction must not be confused with the direction of power flow.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEC-60617 preview: Propagation and signal-flow qualifiers
Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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