PPS Pro version 8.2.pdf - 第117页

4022 591 98 247 User Manual 05.07 P PS-Pro v8.2 113 Guidelines for using PPS-Pro NOTE: Component si ze informat ion from PSI is used to determine areas o n the PCB where vision actions fo r artwork recogn ition are forbi…

User Manual 4022 591 98247

112 PPS-Pro v8.2 05.07

Guidelines for using PPS-Pro

3.3.3.5 Gerber Data handling

PPS-Pro supports only version Gerber RS-274D for artwork extraction.

NOTE: To convert Gerber RS-274X to Gerber RS-274D special software tools can be

used. ExcelCAM and CAM350 are such tools.

NOTE: Restriction on Gerber Coordinates. Position Coordinates must be absolute

values. No leading and trailing zeros are not supported. All gerber layers

have the same unit size. No decimal programming is allowed.

This type of gerber data consists of at least two or more files:

■ Aperture file:

■ Copper layer:

■ Solder resists: layer:

■ Silkscreen layer: (optional):

At least one aperture file is needed for all layers. Alternatively it is also

possible to have an aperture file for each layer. The aperture file has no

standard layout and the columns can differ for each customer/end-user. For

AX machine artwork extraction the aperture file must have a specific format,

and therefore in most cases it should be changed to make it into accordance

with the requirements of the software.

NOTE: For information on Gerber refer to (see APPENDIX B on page 169)

3.3.3.6 Preparing the Gerber files

To make it possible to have artwork fiducial generation, gerber data is needed.

Artwork extraction supports gerber RS-274D format.

NOTE: Depending on what is present on the PCB useful spots on specific (visible)

layers must be found. These can be used as artwork fiducials. Also note that

if no text is printed on the board no Silk layer information is needed.

4022 591 98247 User Manual

05.07 PPS-Pro v8.2 113

Guidelines for using PPS-Pro

NOTE: Component size information from PSI is used to determine areas on the PCB

where vision actions for artwork recognition are forbidden. This means that

correct values (Length, Width and Height) are important and must be filled

in (Mandatory in LOCAL mode).

■ Creating the correct aperture file

PPS-Pro only needs four elements of information in each line of the aperture

file. Although there is no standard for aperture file formats from CAD stations,

here information is given how these files can be changed so that the software

can use them.

Information to look for:

• Shape: Normally circle, square, rectangle, and oblong, round, or other

terms and abbreviations related to these basic shapes.

• X and Y: The dimensions of the aperture in X and Y. Sometimes

indicated by width (X) and length (Y).

• D Code: The number of the aperture. Usually preceded by a “D” but not

always. Typically ranges from 10 up to 200.

• Numeric Format: X and Y can be in inches, mils, millimetres, etc.

(see FIGURE 11 "A correct Aperture file for artwork extraction" on page 115)

■ Properly Formatting an Aperture List

Before importing a list, you must first properly format it. Use a regular text

editor like Windows Wordpad, Excel or Notepad (Always save in ASCII format).

PPS-Pro has some requirements for the file prior to import.

• The file must be a comma separated (csv) text (ASCII) format.

• The first Line defines the Numeric format which can be mil (in case of

mils), inches or mm. Example :

UNIT, = , MILS

• The names must be types that PPS-Pro will understand. (see n

"Accepted Shape Designations" on page 114)

• The import format must be set with the proper column order for each

piece of data (All must be comma separated!):

a) 1st Column D-Code: Must be an integer

b) 2nd Column Shape: String according definition see n "Accepted

Shape Designations" on page 114

c) 3rd and 4th Columns: X / Y of the shape. Size is according the

unit-size set in the first line.

• The numerical format must be set correctly. (mil, inches, etc.)

• Lines not containing aperture information such as headers, expla-

nations, etc. must be either removed or commented-out by using the

User Manual 4022 591 98247

114 PPS-Pro v8.2 05.07

Guidelines for using PPS-Pro

user-selectable comment character in the first column of the

unwanted line.

This may seem like a lot to handle, but it is really quite simple in practice and

is much faster and more reliable than manual input of the apertures.

■ Accepted Shape Designations

PPS-Pro will accept a great variety of text strings as shape names to minimize

the need for editing the files. Keep in mind that PPS-Pro’s extraction system is

only looking for the centres of each feature.

NOTE: If you encounter a strange shape in the file like a target or other exotic

aperture, simply make it square or circular of the same size—it will not

affect the function of the program, only how it is displayed.

PPS-Pro accepts the following strings as designations for units in upper cases:

• Accept as Inch: INCH

• Accept as millimetre (1/1000 metre): MM

• Accept as milli inch (1/1000 inch): MILS

• Accept as micrometer (1/1000000 metre): UM

PPS-Pro accepts the following strings as designations for shape in either

upper, lower or combination cases:

• Accepted as Circle:

ROUND, ROUND_RING, CIRCLE, DONUT, OVAL, ELLIPSE

• Accepted as Rectangle:

RECTANGLE, LINE, OBLONG

• Accepting as Square:

SQUARE

■ Typical Aperture Lists and How to Deal with Them

The following examples illustrate a example and a proper formatted aperture

file.

In the example see FIGURE 10 "Example as starting aperture file" on page 115

a typical customer aperture file.

// aperture_based V2.2 001127