Scanning Method - Banner A-GAGE High-Resolution MINI-ARRAY MAHE6A Instruction Manual

Control Module Configuration

5.3.3 Scanning Method

The control module may be configured for one of three scanning methods (Figure 5-12):
• Straight scan
• Single-Edge scan
• Double-Edge scan
Straight Scan is the default mode in which all beams are scanned in sequence from the
bottom end (cable end) to the top end of the array. This scanning method requires the
longest scan times and provides the smallest object detection size (2.5 mm, 0.1" diameter).
Single-Edge Scan is used to measure the height of a single object. A good application
for this scanning method is box height measurement. For Single-Edge Scan, the System
always activates the first beam channel (nearest the cable end, or "bottom"). If the first
beam is blocked, the sensor will perform a binary search to hunt for the last beam
blocked. Single-Edge Scan works as follows:
1. The receiver scans only the bottom beam until that beam is blocked.
2. When the bottom beam is blocked, the sensor looks to see whether the middle beam
is blocked or made (unblocked).
3. If the middle beam is made (unblocked), the sensor checks the bottom quarter beam;
if the middle beam is blocked, the sensor checks the top quarter beam. (This is called
a binary search; see Figure 5-13.)
4. This routine continues to "narrow the field" until the edge is found.
Note that the receiver always checks the bottom beam first, and only if that beam is
blocked does the binary search continue. Therefore, Single-Edge Scan will not work in
instances where an item that does not block the first beam is to be measured. Single-Edge
Scan is also ineffective if the object does not present a continuous blocked pattern. In
other words, Single-Edge Scan is used for single, solid objects that block the first beam.
Step #1
High-Resolution
Emitter
MAHCN-1
Control Module
-1
MA HCN
20
LLE R 18 19
TRO 17 NC
CON 15 16 TX TX 5
Erro I-AR RAY 13 14 – + Vdc RS-48 ALARM
r No. DIA GN N MIN 12 11 Vdc + – 10-30 ALIGN AX)
— Erro OS OLU TIO 9 10 NC 10-30 GATE 30V(M A MAX
1 r Type TIC S H RES 7 8 150m TX 2 -
Syst em HIG 5 6 T/R T/R 3 - RX
2 Alig n / OK Erro r No. R 3 4 COM DRN BK OUTP WH UT#1 RS- 232 COM
3 Outp blan k POWE 2 1 NC +12V BU 5 Wires 5 -
4 E / ut Shor 4 Erro r Type BR A MAX 30V 20
R Mism t 5 Emit 150m 19
Rece iver atch 6 Seria ter Erro r F1 – RCVR 17 18
Erro r l Com V dc + TICS 16
7 EEPR m 16-30 MAX EMTR NOS 14 15
8 CPU OM 1A DIAG CATO R 13
Null Erro r INDI 11 12
/ Span NT 10
ALIG NME 8 9
SWI TCH 7
5 6
4
POW 2 ER 3
1
Step #4
Beam #40
Blocked
Figure 5-13. Finding an edge using a binary search
24
P/N 64118 rev. B
Beam #1 of 64
Blocked
High-Resolution
Receiver
Step #5
Beam #44
Clear
Figure 5-12. Scanning Method selections
Step #2
Beam #32
Blocked
Step #6
Beam #42
Blocked
Banner Engineering Corp.
www.bannerengineering.com • Tel: 763.544.3164
(PSF Configuration screen)
Step #3
Beam #48
Clear
Step #7
Beam #43
Blocked
Minneapolis, U.S.A.
•