Installation Of Two Or More Light Barriers; Timing Diagram - Cedes ELS 300 Mode D'emploi

ELS 300
5.3.

Installation of two or more light barriers

To avoid cross-talking effects, it is necessary to keep a minimum clearance between two systems. This clearance
depends on the operating range at which the systems are used. In the diagrams in Figure 5, the minimum
clearance for the different types is shown.
Rx1
Clearance
Tx2
Operating range [m]
Figure 5: Clearance in function of operating distance
5.4.

Timing diagram

Power supply Tx
uninterrupted
State of light beam
Output Rx:
NPN/DO
PNP/LO
Output Rx:
NPN/LO
PNP/DO
t
ON
Figure 6: Timing diagram
6
Tx1
Rx2
Operating range
uninterrupted
interrupted
t t
RI RL
Installation and operation manual
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.00
0.2
Turn-on time t
Turn-off time t
Response time on interruption t
Response time on light t
t
OFF
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ELS 300 Narrow aperture
Use not recommended,
because of crosstalking
0.4 0.6 0.8
Operating range [m]
Operating range [m]
ON
OFF
RI
RL
© CEDES/October 2016
1 1.2
ELS 300 N & NA
< 30 ms
< 40 ms
< 20 ms
< 20 ms