Device description
Leuze electronic
LES 36
23
TNT
35/7-2
4
V
The Figure 4.2 shows the effect of the activation on laser and measurement value output in
"Free Running" mode.
4.2.3
Triggering - Free Running
The Light section sensors can measure in two modes:
• In "Free Running" operation the Light section sensor determines measurement results
with a frequency of 100Hz and outputs these continuously via the interface X2.
• Alternatively, single measurements can also be carried out. For this purpose, the Light
section sensor requires a trigger signal at the trigger input (pin 5 on X1), a PROFIBUS
trigger or the
Ethernet Trigger
command in measure mode (see
Chapter 10.3.4"Commands in measure mode" on page 111).
When triggering via pin 5 at X1, note:
- Triggering occurs on the rising edge.
- The trigger pulse must be at least 100μs long.
- Before the next trigger, the trigger cable must be on low-level for at least 1ms.
- Activation must occur at least 100μs before the trigger edge.
- The shortest possible time interval between two successive trigger edges is 10ms.
Note!
Ex works, the LES is set to
Free Running
(shown on display:
fRun
). In order for it to
respond to signals on the trigger input, the operating mode must be set via the LESsoft con-
figuration software to
Input Triggered
(shown on display:
Trig
).
Figure 4.3:
Trigger input signal sequence
p
t
A second trigger
pulse before 10ms
have elapsed has
no effect
Trigger time (rising edge)
Laser
Activation input
Pin 2 at X1
Output
(Ethernet)
Data packets, approx. 1ms
t
fix
Approx. 14ms
Trigger input
Pin 5 at X1
Axes: p = level, t = time
