Device description
Leuze electronic
LES 36
26
TNT
35/7-2
4
V
4.3.1
Inspection Task
The LES supports up to 16 individual inspection tasks. Grouped together in an inspection
task are all parameter settings relevant for an application:
• Operation Mode (Free Running, Input Triggered)
• Activation Input (switch laser on and off)
• Cascading Output
• Light Exposure (exposure duration of the laser)
• Field of View (sensor detection range)
• Edit Analysis Windows (size and position of four AWs and four EAWs, object detection
and edge detection parameters)
• Edit Logical Combinations (logic combination of AWs and EAWs, definition of the val-
ues that are available via the Profibus)
• Analog Output (analog output definitions)
The selection of the inspection tasks is carried out:
• via the switching inputs of connection X3 (inspection tasks 0-7 only)
• Via PROFIBUS
• via LESsoft (on a PC connected via X2)
• via Ethernet (on a process control connected via X2)
• via the control panel of the sensor beginning with firmware V01.40.
4.3.2
Edge Analysis Window (EAW)
EAWs are used for edge detection; they can also be used for object detection. EAWs are
configured in the LESsoft configuration software (see chapter 9.4 "Parameter settings/
Parameters tab", Figure 9.3). Here, position and size of each EAW are defined. To ensure
stable measurement of edge positions, it is also possible to
• check the edge quality (Sequent Hits, see below),
• count the number of measurement points to be detected in the EAW (a quasi minimum
object size).
An evaluation is carried out only within the active EAWs. Areas outside of the measurement
range and field of view are ignored.
Characteristics of EAWs
• EAWs are rectangular and may overlap freely.
• The coordinates of the left-most measurement point ("leftmost" LX, LZ) and right-most
measurement point ("rightmost" RX, RZ) are determined in each EAW.
• EAWs usually have an absolute position. If the object position varies, an EAW can also
be positioned relative to a found edge position in the previous EAW and thus tracked.
