P/N 130426 Rev.
D
5
Banner Engineering Corp.
•
Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
A-GAGE EZ-ARRAY
Instruction Manual
Overview
When the gray wire is disabled, the receiver is in continuous
scan mode; it begins a new scan immediately after updating
the outputs from the previous scan. (Continuous scan is used
in most analog output applications and whenever continuous
updating of the outputs is acceptable.) The gray wire is always
enabled when in DIP switch mode.
•
Remote Teach
— The gray wire provides the full Remote
Teach functionality shown in Figure 1.5.
• Alignment/Sensitivity
— This mode is an abbreviated version
of Remote Teach. It can perform the alignment and sensitivity
adjustment functions, but not the display inversion or DIP
switch enable/disable functions.
Gate Mode
options can be selected via the PC interface only.
The gray wire provides a gate input pulse, typically from a dc
device such as an NPN-output photoelectric sensor or a PLC
discrete output. Refer to Section 5 for more information.
• Gate – Active High
— The receiver scans whenever the gate
is pulled high.
• Gate – Active Low
— The receiver scans whenever the gate
is pulled low.
• Gate – Rising Edge
— The receiver scans once for each low-
to-high gate transition. (Multiple transitions cannot be faster
than the sensor’s response for them to be reliably detected.)
• Gate – Falling Edge
— The receiver scans once for each
high-to-low gate transition. (Multiple transitions cannot be faster
than the sensor’s response for them to be reliably detected.)
1.6 Scanning Method
One of three scanning methods may be configured:
• Straight scan
• Single-edge scan
• Double-edge scan (1, 2, 4, 8, 16, or 32 steps)
Sensor response time is a function of sensor length and
scanning method. Maximum scan times are shown in Figure 1-
8
.
Straight Scan
is the default mode, in which all beams are
scanned in sequence, from the display end to the far end
of the array. This scanning method provides the smallest
object detection size. Straight scan is used when low-contrast
sensitivity is selected or when single-edge and double-edge
scan cannot be used. The edge resolution is 5 mm (0.2"). When
low-contrast sensing is selected (used when measuring semi-
transparent objects), the minimum object detection size is 5 mm
(0.2") diameter. When high-excess-gain sensing is selected, the
minimum object detection size is 10 mm (0.4"). See Figure 1-5.
Single-Edge Scan
is used to measure the height of a single
object. This scanning method is commonly used for box height
measurement. For single-edge scan, the receiver always
activates the first beam channel (or “bottom” beam, nearest the
display). When the first beam is blocked, the sensor performs a
binary search to hunt for the last beam blocked, as follows:
1. The receiver scans only the first beam until it is blocked (see
Figure 1-7).
2. When the first 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.
4. The routine continues to divide the number of beams in half
until the edge is found.
Single-edge scan can be used only for single, solid objects
that block the first beam (closest to the display). Because the
receiver checks only the first beam until it is blocked, single-edge
scan will not function when the item to be measured does not
block the first beam. Single-edge scan is also ineffective if the
object does not present a continuous blocked pattern.
Single-edge scan works only when the high-excess-gain setting
is enabled. When single-edge scan is selected, the sensor object
detection size is 10 mm and edge resolution is 2.5 mm.
Figure 1-6. The effect of scan mode and step size on minimum object detection size and edge resolution
Scanning Method
Straight Scan
Single-Edge
Scan
Double-Edge Scan (per Edge)
Low-
Contrast
High-Excess-
Gain
Step Size (Number of Beams)
1
2
4
8
16
32
Minimum Object
Detection Size*
5 mm
(0.2")
10 mm
(0.4")
10 mm
(0.4")
10 mm
(0.4")
20 mm
(0.8")
30 mm
(1.2")
50 mm
(2")
90 mm
(3.6")
170 mm
(6.8")
Edge Resolution
5 mm
(0.2")
5 mm
(0.2")
2.5 mm
(0.1")
2.5 mm
(0.1")
2.5 mm
(0.1")
2.5 mm
(0.1")
2.5 mm
(0.1")
2.5 mm
(0.1")
2.5 mm
(0.1")
*MODS determined using a rod target object
