X service技术参数 - 第37页

37 Vision Sensor Technology Bad Board Recognition Position Recognitio n for Feeder Modu les Ink Spot Criter ia Evaluation met hod for f id uc ia ls for structures brightness m ethod contrast me thod Shap es an d si zes o…

Vision Sensor Technology

PCB Position Recognition

Fiducial criteria

Locate 2 fiducials

Locate 3 fiducials

X-/Y-position, rotation angle,

mean PCB distortion

in addition: shear, distortion in X- and

Y-direction separately

Fiducial shapes Choose synthetic fiducials from the

menu: circle, cross, square, rectangle,

rhombus, circular, square, and rectan-

gular contours

Fiducial surface:

Copper

Tin

Without oxidation and solder resist

Warp ≤ 1/10 of structure width, both

with good contrast to environment

Fiducial dimensions:

Circle

Cross

Rectangle/square

Rhombus

Diameter: 0.3 - 3 mm

Length and width: 0.3 - 3 mm

Line thickness: 0.1 - 1.5 mm

Edge length: 0.3 - 3 mm

Diagonal: 0.3 - 3 mm

Fiducial environ-

ment

Clearance around reference fiducial

not necessary if there is no similar

fiducial structure in the search area

Teach Synthetic Fiducial

Description

Different fiducial shapes

prove to be optimal depend-

ing on the condition of the

surface.

Particularly advisable for bare

copper surfaces with little

oxidation is the single cross.

Maximum recognition reli-

ability is achieved due to the

high information content.

Rectangle, square and circle

are less “informative” but

save space, are rugged, and

can even be used when oxi-

dation is at an advanced

stage.

Advisable for tinned struc-

tures are circle or square

because in this case the ratio

of the fiducial dimensions to

the presolder thickness is

particularly favorable.

Fiducial editor

Vision Sensor Technology

Bad Board Recognition

Position Recognition for Feeder Modules

Ink Spot Criteria

Evaluation method

for fiducials

for structures

brightness method

contrast method

Shapes and sizes of fidu-

cials/structures for

brightness method

contrast method

square or circular forms

edge length / diameter 0.3

to 5 mm

rectangular shapes

edge length: 0.3 to 5 mm

Masking material mat dark (light-absorbing)

not recommended: white or

shiny

Recognition time 0.3 s for each method

Description

In the cluster technology

each subpanel is assigned an

ink spot. If this is present dur-

ing the measurement via the

PCB vision module, the corre-

sponding subpanel is popu-

lated.

It is also possible to accom-

plish the population of the

subpanel when the ink spot is

missing. With this function it

is possible to eliminate costs

due to unnecessary popula-

tion of faulty subpanels.

Global Ink Spot

Each GOOD/SCRAP scan takes

some time, and the time

required is even greater if

there are a large number of

subpanels on a PCB. Using

the global ink spot can result

in a significant reduction of

these secondary times.

The PCB vision module

searches at positions taught

before for the defined fidu-

cial. In case of recognition

there is no following evalua-

tion of subpanels. The sys-

tem allows the operator to

choose also the reverse inter-

pretation.

Recognition of the position

of the feeder modules

The pick-up position of the

components can be deter-

mined precisely with the aid

of the position recognition

for the feeder. The offset in

position relative to the stored

ideal position is determined

on the basis of fiducials on

the feeder modules using the

PCB vision module. This pro-

vides a very high pick-up reli-

ability even for the very first

component. This is particu-

larly important for small com-

ponents.

Technical Data

Siemens Signal Interface

Connector Assignment

Signal interface (20-pin ribbon cable connector)

Upstream station X1 Downstream station X2

Pin 1 Reserved Pin 1 Reserved

Pin 2 GND 24 VDC Pin 2 Reserved

Pin 3 + 24 VDC Pin 3 Reserved

Pin 4 Reserved Pin 4 Reserved

Pin 5 Reserved Pin 5 GND 24 VDC

Pin 6 Reserved Pin 6 + 24 VDC

Pin 7 Reserved Pin 7 Reserved

Pin 8 Reserved Pin 8 Reserved

Pin 9 Reserved Pin 9 Reserved

Pin 10 Reserved Pin 10 Reserved

Pin 11 Interfering signal loop Pin 11 Interfering signal loop

Pin 12 Interfering signal loop Pin 12 Interfering signal loop

Pin 13 GND 24 VDC Pin 13 GND 24 VDC for permission /

arrived (galvanic isolation)

Pin 14 Arrived Pin 14 Arrived

Pin 15 Permission Pin 15 Permission

Pin 16 Reserved Pin 16 Reserved

Pin 17 Reserved Pin 17 Reserved

Pin 18 Transferred Pin 18 Transferred

Pin 19 Request Pin 19 Request

Pin 20 GND 24 VDC for request / trans-

ferred (galvanic isolation)

Pin 20 GND 24 VDC