3 scanning method, Control module configuration – Banner A-GAGE High-Resolution MINI-ARRAY Series User Manual
Page 24
P/N 64118 rev. B
Control Module Configuration
24
Banner Engineering Corp.
•
Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
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.
Figure 5-12. Scanning Method selections
(PSF Configuration screen)
DIA
GNOSTICS
Error N
o.
Error T
ype
Error N
o.
Error T
ype
—
Syste
m O
K
4
Emit
ter Er
ror
1
Alig
n / b
lank
5
Seria
l Com
m
2
Outp
ut Sh
ort
6
EEPR
OM
3
E / R
Mism
atch
7
CPU
Erro
r
4
Rece
iver E
rror
8
Null /
Span
1
POW
ER
2 - T
X
3 - R
X
5 - C
OM
ALI
GNM
ENT
SW
ITC
H
DIA
GNO
STI
CS
IND
ICA
TOR
RS-2
32
MA
HCN
-1
HIG
H R
ESO
LUT
ION
MIN
I-AR
RAY
CO
NTR
OLL
ER
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
+
NC
NC
10-
30V
dc
GAT
E
NC
TX
TX
+12
V
BR
EM
TR
RCV
R
BU
BK
5 W
ires
WH
30V
150
mA
MA
X
OUT
PUT
#1
COM
DRN
T/R
T/R
16-
30V
dc
1A
MA
X
POW
ER
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
OUTPUT
ALARM
GA
TE
ALIGN
–
+
–
F1
30V
(MA
X)
150
mA
MA
X
ALA
RM
10-
30V
dc
ALI
GN
RS-
485
+
–
High-Resolution
Emitter
MAHCN-1
Control Module
High-Resolution
Receiver
Beam #1 of 64
Blocked
Beam #48
Clear
Beam #32
Blocked
Beam #44
Clear
Beam #40
Blocked
Beam #42
Blocked
Beam #43
Blocked
Step #2
Step #1
Step #3
Step #4
Step #5
Step #6
Step #7
Figure 5-13. Finding an edge using a binary search