Owner manual

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