PCS
Power converter / inverter
An identified interface converting electrical power between documented circuit forms.
SLD / Schematic
IEC · Q020503
Alternating bidirectional propagation qualifier
This qualifier identifies opposite-direction propagation occurring alternately.
IEC · Alternating bidirectional 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 · Q020503
What it represents
This qualifier identifies opposite-direction propagation occurring alternately. The two directions are used at different times, making the temporal relationship different from simultaneous two-way propagation. The underlying link can still appear as a single path.
Record which functions send and receive and how the documented operation changes direction. Do not interpret the qualifier as two independent physical cables.
How to read it
- Describe the direction-changing or turn-taking arrangement separately.
- Alternating bidirectional propagation differs from simultaneous bidirectional transmission.
Information to show or reference
- Identify the associated device, circuit or diagram boundary.
- Describe the direction-changing or turn-taking arrangement separately.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.
A distinction that matters
Alternating bidirectional propagation differs from simultaneous bidirectional transmission.
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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