Banner A-GAGE High-Resolution MINI-ARRAY Series Manuel d'utilisateur télécharger pdf (Page 25)

Banner Engineering Corp. •Minneapolis,U.S.A.

www.bannerengineering.com•Tel:763.544.3164

P/N64118rev.B

Double-Edge Scanisusedtodetecttwoedgesofasingleobject,forexample,box

widthmeasurements.Double-EdgeScanrequirestheselectionofastepsize:2,4,8,

16or32beams.Thesensorusesthestepsto“skip”overbeams.Double-EdgeScan

worksasfollows:

1. Thesensoractivatesbeam#1(thebeamclosesttothesensorcableend).

2. Thesensoractivatesthenextbeam,determinedbythestepsize.(Forexample,if

thestepsizeis2,beam#3isnext;ifthestepsizeis8,beam#9isnext.)

3. Aslongastheactivatedbeamisunblocked(or“made”),thesensorwillcontinue

thesteppingroutineuntilablockedbeamisfound.

4. Whenablockedbeamisfound,abinarysearchisconductedtofindtheobject’s

“bottomedge.”

5. Whenthebottomedgeisfound,thesensorbegins“stepping”againthroughthe

arrayuntilthesensorfindsthenextunblockedbeam.

6. Abinarysearchisagainperformedtofindthesecondedge.

Notethatthisscanningmethodsacrificesobjectdetectionsizeforspeed.Similarto

Single-EdgeScan,Double-EdgeScanhassomerestrictions:theobjectshouldprovide

asolidobstruction;thesizeoftheobjectwilldeterminethemaximumstepsize

(Figure5-14).

Sensorresponsetimeisafunctionofsensorlengthandscanningmethod.Typical

scantimesareshowninFigure5-15.

Step Size

Number of Beams

Minimum

Object

Detection

Size

5mm

(0.2")

10mm

(0.4")

20mm

(0.8")

40mm

(1.6")

80mm

(3.2")

Maximum Scan Times (in milliseconds)

Array

Length

Straight

Scan

Single-

Edge

Scan

Double-Edge Scan

Step

2 Beams

Step

4 Beams

Step

8 Beams

Step

16 Beams

Step

32 Beams

163 mm

(6.4")

5.8 1.8 3.4 2.7 2.5 2.6

325 mm

(12.8")

10.6 1.9 8.1 5.1 3.6 3.0 2.7

488 mm

(19.2")

15.0 2.1 11.5 6.8 4.5 3.4 3.0

650 mm

(25.6")

20.1 2.1 14.9 8.5 5.3 3.9 3.2

812 mm

(32.0")

24.9 2.1 18.3 10.1 6.1 4.2 3.5

975 mm

(38.4")

30.0 2.1 21.7 11.8 7.0 4.7 3.6

1138 mm

(44.8")

34.5 2.1 25.0 13.5 7.9 5.1 3.8

1300 mm

(51.2")

39.3 2.1 28.4 15.2 8.7 5.5 4.1

1626 mm

(64.0")

48.0 2.3 35.1 18.6 10.4 6.4 4.5

4.8

1788 mm

(70.4")

53.6 2.3 38.5 20.3 11.2 6.8 4.7

Figure 5-14. The effect of step size on

minimum object detection size

Figure 5-15. The effect of sensor length and scanning method on scan time (typical)

Control Module Configuration

Banner Engineering Corp. •Minneapolis,U.S.A.

www.bannerengineering.com•Tel:763.544.3164

NOTE:Scantimesareexclusiveofserial

communicationtransmissiontimes.

1463 mm

(57.6")

44.0 2.2 31.8 16.9 9.5 5.9 4.3

1951 mm

(76.8")

58.4 2.3 41.9 21.9 12.1 7.2 4.9

2 4 8 16 32

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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Banner A-GAGE High-Resolution MINI-ARRAY Series Manuel d'utilisateur Page 25

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