Functions
Leuze electronic
CML 720i Ex
25
Calculation
The number of beams for crossed-beam scanning n
p
is calculated from the number of beams for parallel-
beam scanning n
k
.
Formula for calculating the number of beams for crossed-beam scanning
n
K
[number] = number of beams for crossed-beam scanning
n
p
[number] = number of beams for parallel-beam scanning
Example: 288 beams in parallel-beam scanning become 862 logical beams in crossed-beam scanning.
With a beam spacing of 5 mm, this spacing is reduced to 2.5 mm in the center area.
4.2
Measurement beam sequence
By default, the counting direction of the beams begins at the sensor connection unit. It can, however, be
reconfigured so that counting begins with 1 at the sensor head.
The simplest application case for the inverted beam sequence is vertical mounting with the connection unit
at the top, e.g., for height measurement, where beam 1 is to begin at the bottom:
a
Receiver connection unit
b
Optical part
Another variant with two successive light curtains, where the second is rotated by 180° and counting again
begins with 1, is illustrated as follows:
a
Receiver connection unit
b
Optical part
For width detection, counting can begin with 1 at either end at the head part of the sensor as shown below:
NOTICE
Minimum distance for crossed-beam scanning!
For crossed-beam scanning, the minimum distance that must be maintained between transmitter and
receiver changes, whereby the values vary depending on beam spacing (see chapter 16).
The “crossed-beam” mode (crossed-beam scanning) can be activated via the respective fieldbus
interface (see chapter 9 et seq.) or via the
Sensor Studio
configuration software (see
nk 3np 2
–
=
a
b
1
... n
a
1
... n
b
b
a
1
... n
