Device description
22
Technical description LES
Leuze electronic
4.2
Operating the sensor
4.2.1
Connection to PC / process control
Configuration
For commissioning the light section sensors are connected to a PC via the Ethernet interface
(see "Connection X2 - Ethernet" on page 48) and are then set using the configuration
software supplied LESsoft.
Measurement operation
In measurement operation, the LES 36/VC is connected to the process control via its analog
output, the LES 36/PB is connected to the process control via PROFIBUS. Alternatively, the
LES can be operated via the Ethernet interface on X2, see chapter 10 "Integrating the LES
in the process control (Ethernet)". Additional sensor information is then available.
4.2.2
Activation - laser on/off
The laser and the data transmission can selectively be switched on and off via the activation
input
InAct
(pin 2 at X1) or via the 'Ethernet Trigger' command. Thus possible glares due
to laser radiation can be prevented during time periods when no measurements are
performed.
Notice!
The sensor is delivered ex works with the
Activation Input Disregard
setting. The
possible activation sources (activation input and Ethernet activation) are ignored - the
measurement function of the sensor is enabled.
The activation function can be switched on via the configuration software. To do this, the
Activation Input
parameter must be set to
Regard
. The sensor then only measures if
one of the activation sources is activated. If the sensor is waiting for activation, it displays
!Act in the display.
Figure 4.2:
Activation input signal sequence
p
t
Laser off
Laser off
Exposing and measuring
Processing and transmitting
Laser
Activation input
Pin 2 at X1
Output
10ms between 2 consecutive
laser pulses in "Free Running"
mode
Axes: p = level, t = time
approx. 14ms
between laser pulse and
associated data output
