Use the PURGE and AUDIT commands in AutoCAD before converting to remove ghost blocks and unused layers.
Always check your units (inches vs. millimeters) before importing. dwg to pln converter
If symbols aren't appearing correctly, exploding complex blocks in the source DWG can sometimes help. If you'd like to dive deeper, let me know: Which version of Archicad are you using? Are you dealing with 2D drawings or 3D AutoCAD models ? Use the PURGE and AUDIT commands in AutoCAD
If you are already working in a PLN and need the DWG as a background: Go to . dwg to pln converter
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