The only information that I was able to find about the config.pro pen#_line_weight options stated that the line weight is equal to 0.005 inch line thickness:
The weight of a printed line is governed by its pen number. Correspondingly, the pen number of a line is governed by its color. As an example, the Hidden color (blue) is assigned to pen one. The line weight produced from a pen number can be modified with the configuration file option pen#_line_weight (where # is equal to the pen number). Each option can be set equal to a value ranging from 1 to 16. Each increment value equals a value of 0.005 inches. As an example, if pen1_line_weight is set to 2, the line weight will be equal to 0.010 inches (2 × .005 = .010).
Source: Kelley, David S. "Chapter 8 Creating a Pro/Engineer Drawing." ProENGINEER 2001 Instructor. 1st. McGraw-Hill, 2001. pp 306. ISBN 0072510072
Assuming the conversion is correct, then a default table.pnt that you could use with all black lines would be:
pen 1 thickness 0.020 in; color 0.0 0.0 0.0
pen 2 thickness 0.005 in; color 0.0 0.0 0.0
pen 3 thickness 0.010 in; color 0.0 0.0 0.0
pen 4 thickness 0.015 in; color 0.0 0.0 0.0
pen 5 thickness 0.010 in; color 0.0 0.0 0.0
pen 6 thickness 0.015 in; color 0.0 0.0 0.0
pen 7 thickness 0.005 in; color 0.0 0.0 0.0
pen 8 thickness 0.020 in; color 0.0 0.0 0.0
If you want more information with other options like colors, see PTC Suggested Technique for Creating Plotter Configuration Files http://support.ptc.com/cs/cs_27/howto/plt737/plt737.htm
I put together the following information just for reference, hope that it might help someone else:
! =========================
! Pen Table Mapping
! =========================
!
! Pen 1 Mapping:
! * Outline Geometry, Section Text / Arrows, Object Lines
! * White Entities
! * Plot with solid lines: Visible geometry, Cross-section cutting plane arrows and text, Drawing format and
! boundary, Tag text, Centerline line font with white color, Brown portion of datum planes;
! * Plot with phantom lines: Cross-section cutting plane lines
!
! Pen 2 Mapping:
! * Dimension Lines and Leaders, Cross Hatching, Text**
! * Yellow Entities
! * Plot with solid lines: Dimension lines, Geometric tolerance lines, All text (except cross-section text),
! Balloon notes, Cross-hatching, Centerline line font with yellow color, Leaders;
! * Plot with centerlines: Axes and centerlines
! (line_style_standard = std_ansi**)
!
! Pen 3 Mapping:
! * Hidden Lines
! * Gray Entities
! * Plot with dashed lines with phantom font: Hidden lines
!
! Pen 4 Mapping:
! * Drawing Frame
! * Red Entities (Primary Highlight (Dark Red), Selected (Red), Secondary Selected (Orange))
! * Plot with solid lines: Spline surface grid (does not plot in drawings)
!
! Pen 5 Mapping:
! * Sheet Metal
! * Green Entities
! * Plot with solid lines: Sheet metal color entities
!
! Pen 6 Mapping:
! * Sketch Lines, Section
! * Cyan Entities
! * Plot with solid lines: Sketcher section entities
!
! Pen 7 Mapping:
! * Tangent Edges (Dimmed e.g. Tangent Edges)
! * Dark Gray Entities
! * Plot with solid lines: Toggled sections, Grayed dimensions and text, Dimmed tangent edges, Dark gray
! portion of datum planes
!
! Pen 8 Mapping:
! * Text** (Spline Surface Grid) [use for drawing perimeter border in format]
! * Blue Entities
! * Plot with solid lines: Spline surface grid
! (line_style_standard = std_iso**)
!
! **Note that the text pen is reassigned according to line_style_standard set in drawing config file.
!
!
! PTC Suggested Technique for Creating Plotter Configuration Files
! http://support.ptc.com/cs/cs_27/howto/plt737/plt737.htm
!
!
!
! =========================
! Pen Table System Colors
! =========================
!
! Pen No ==> System Color ==> Visible Color ==> System Color Name
!
! Pen 1 ==> Geometry ==> White ==> drawing_color
! Pen 1 ==> Curve ==> Dark Blue ==> presel_highlight_color*
! Pen 1 ==> Manufacturing Volume ==> Purple ==> magenta_color
! Pen 1 ==> Quilt ==> Magenta ==> quilt_color
! Pen 1 ==> Datum ==> Brown ==> datum_color
! Pen 1 ==> Preselection Highlight ==> Cyan ==> presel_highlight_color*
! Pen 1 ==> Preview Geometry ==> Yellow ==> preview_geom_color*
! Pen 1 ==> Secondary Preview Geom ==> Pale Yellow ==> secondary_preview_color*
!
! Pen 2 ==> Letter ==> Yellow ==> preview_geom_color*
!
! Pen 3 ==> Hidden Line ==> Gray ==> half_tone_color
!
! Pen 4 ==> Highlight-Primary ==> Dark Red ==> highlight_color
! Pen 4 ==> Selected ==> Red ==> selected_color*
! Pen 4 ==> Secondary Selected ==> Orange ==> secondary_selected_color*
!
! Pen 5 ==> Sheet Metal ==> Dark Green ==> attention_color
!
! Pen 6 ==> Sketched Curve ==> Blue ==> section_color
!
! Pen 7 ==> Highlight-Secondary ==> Dark Gray ==> dimmed_color
!
! Pen 8 ==> Highlight-Edge ==> Green ==> edge_highlite_color
!
! *These colors are reserved for specific purposes and may not be assigned to other entities/uses.
!
! =========================
! Default line patterns:
! =========================
! pattern (1st segment length) (1st space length) (2nd segment length) (2nd space length) (units)
!
! pen 3 pattern 0.1 0.05 0.025 0.05 in
!
! =========================
! Default line thickness:
! =========================
! thickness (value) (units)
!
! pen 1 thickness 0.05 in
! pen 2 thickness 0.5 cm
!
! =========================
! Default pen colors:
! =========================
! color (proportion of red) (proportion of green) (proportion of blue)
!
! pen 7 color 0.0 0.5 1.0
!
! =========================
! Mapping entities to other pens:
! =========================
! pen number (system_color_name)
!
! pen 1 dimmed_color
! pen 1 letter_color background_color
! pen 1 section_color; dimmed_color
!
! =========================
! Pen Table Examples
! =========================
!
! pen 1 color 0.0 0.0 0.7; highlite_color
! pen 2 thickness 0.5 cm; letter_color; dimmed_color
! pen 5 pattern 1.0 0.1 0.5 0.01 in; color 1.0 0.0 1.0; drawing color
!
!
! *Note: If a pen table file file called table.pnt is in the working directory,
! Pro/ENGINEER will automatically use it when creating plot files even though
! it is not explicitly selected by the user.
!
!
! =========================
! Pen Table Default Weight
! =========================
! Set in config.pro
!
! pen1_line_weight 4
! pen2_line_weight 1
! pen3_line_weight 2
! pen4_line_weight 3
! pen5_line_weight 2
! pen6_line_weight 3
! pen7_line_weight 1
! pen8_line_weight 4
!
! Each increment value equals a value of 0.005 inches.
!
! pen 1 thickness 0.020 in; color 0.0 0.0 0.0
! pen 2 thickness 0.005 in; color 0.0 0.0 0.0
! pen 3 thickness 0.010 in; color 0.0 0.0 0.0
! pen 4 thickness 0.015 in; color 0.0 0.0 0.0
! pen 5 thickness 0.010 in; color 0.0 0.0 0.0
! pen 6 thickness 0.015 in; color 0.0 0.0 0.0
! pen 7 thickness 0.005 in; color 0.0 0.0 0.0
! pen 8 thickness 0.020 in; color 0.0 0.0 0.0
!
! Source: page 306. Kelley, David S. "Chapter 8 Creating a Pro/Engineer Drawing."
! ProENGINEER 2001 Instructor. 1st. McGraw-Hill, 2001. ISBN 0072510072