AOpen AOI-702U Spezifikationen PDF herunterladen (Seite 43)

specifies the units of the Device co-ordinates. The base unit is micron.

Therefore, a number of 1000 indicates the scale mm is used, 25.4 means the

unit is mils. InvertXPos and InvertYPos specify whether the co-ordinates

data need to be inverted during import. Sometime the position of the Devices

on the bottom side of the PCB is represented using top side co-ordinates. In

cases such as this, inverting one of the co-ordinates during import would be

necessary. Use 1 if inversion is desired, otherwise 0. The BoardRtn field

indicates the angular difference of the co-ordinates between the CAD data

and the board being inspected. Because of the fixture limitations, it is

sometimes not possible to inspect the board in the same orientation as the

CAD data. A number of 90 in this field indicates the board being inspected is

rotated 90 degrees counter clockwise from the CAD data. The valid data in

the field are 90, 180, and 270. There is a second optional data field for this

line; it can be either 1 or -1; 1 is the default value which indicates that the

Device rotation field uses a sign convention that counter-clockwise is positive.

A value of -1 indicates that the Device rotation uses a convention that

clockwise is positive. Rot’nOffset is an offset value that will be added to all

the device rotations. The function of this offset is to match the rotation of the

CAD data to that of the Central of Shared library Device. The .DATA_START

field is a flag indicating the beginning of the Device data. This field is case

sensitive. The following line is the column label of the Device data. Device

data begins on the next line.

RefID Name X Y Rot. CamNo Package

IC1 ---- 123.3 23.45 0 0 ----

U2 74LS14 23 23 0 0 ----

R1 001-89-57 12.3 3.45 0 0 ----

C123 001-90-23 23 23 0 0 ----

...(more lines of Device data)

...

.DATA_END

At the end of the Device data there must be a flag, .DATA_END, to indicate

the end of the Device data.

Exporting

In addition to extracting information from a CAD data file, the system can also

generate a file in this format based on the information from a board setup. The

process is called Exporting. To export CAD data, select File | Export CAD

Data from the main menu.

Importing

Compared to Exporting, Importing CAD data is a much more complex

process. The process begins by the user selecting File | Import CAD File

from the main menu. The system opens the specified file to verify its format. If

the format is correct, the system prompts the user to load a board

corresponding to the CAD data into the system.

The software analyzes the Device position information from the CAD data and

positions the Image over three Devices on the board. Each time the user is

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