Banner A-GAGE High-Resolution MINI-ARRAY MAHE6A Instruction Manual page 20

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A-GAGE High-Resolution MINI-ARRAY
Step #1
High-Resolution
Emitter
MAHCN-1
Control Module
1
MAH CN-
20
LLE R 18 19
TRO 16 17 NC
RAY CON 14 15 – TX TX ALARM
Error No. DIA N MIN I-AR 12 – 13 10-30V + dc RS-485
— GN TIO 10 11 + 10-30V ALIGN dc 30V(MA X) MAX
Error Type OS TIC H RES OLU 8 7 9 NC GATE 150mA 2 - TX
1 Syste S HIG 5 6 T/R 3 - COM RX
2 Align m OK Error No. R 3 4 DRN BK T/R OUTPU WH T#1 RS- 232 5 -
3 Outp / blank POWE 2 1 NC +12V BU COM 5 Wires
4 ut Short 4 Error BR MAX 30V 20
E / R Mism 5 Emitt Type F1 150mA 19
Rece iver atch 6 Seria er Error – RCVR 17 18
Error 7 l Comm + dc TICS 15 16
8 EEPR OM 16-30V MAX 1A DIAG EMTR ATOR NOS 14
CPU Error INDIC 12 13
Null NT 10 11
/ Span ALIG NME CH 8 9
SWIT 7
5 6
4
POW 2 ER 3
1
Step #4
Beam #40
Blocked
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.
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 continues 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.
Table 1: The Effect of Step Size on Minimum Object Detection Size
Step Size
Minimum Object
5 mm (0.2 in)
Detection Size
Sensor response time is a function of sensor length and scanning method. Typical scan times are shown in the following
table.
Table 2: The Effect of Sensor Length and Scanning Method on Scan Time (Typical)
Array Length Straight Scan
163 mm (6.4 in)
20
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Beam #1 of 64
Blocked
High-Resolution
Receiver
Step #5
Beam #44
Clear
Figure 20. Finding an Edge Using a Binary Search
2 4
10 mm (0.4 in)
Maximum Scan Time (in milliseconds)
Single-Edge
Scan
Step 2 Beams
5.8 1.8
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Step #2 Step #3
Beam #32
Blocked
Step #6
Beam #42
Blocked
Number of Beams
8
20 mm (0.8 in)
Double-Edge Scan
Step 4 Beams Step 8 Beams
4.8 3.4
Beam #48
Clear
Step #7
Beam #43
Blocked
16 32
40 mm (1.6 in) 80 mm (3.2 in)
Step 16 Beams Step 32 Beams
2.7 2.5 2.6