HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 260)

Programming: Data Transfer from CAD Files
7.3 DXF converter (Option #42)
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
Setting layers
As a rule, DXF files contain multiple layers. The designer uses the
layers to create groups of various types of elements, such as the
actual workpiece contour, dimensions, auxiliary and design lines,
shadings, and texts.
So that as little unnecessary information as possible appears on the
screen during selection of the contours, you can hide all excessive
layers contained in the DXF file.
The DXF file to be processed must contain at least
one layer. Elements not assigned to a layer are
automatically moved by the TNC to the "anonymous"
layer.
You can even select a contour if the designer has
saved it on different layers.
Select the mode for the layer settings: In the list
view window the TNC shows all layers contained
in the active DXF file
Hide a layer: Select the layer with the left
mouse button, and click its check box to hide it
Alternatively, use the space key
Show a layer: Select the layer with the left
mouse button, and click its check box to show it
Alternatively, use the space key