Figure 9. Examples of Incorrect Emitter/Receiver Orientation
Receiver
Emitter
Receiver
Emitter
Cable ends point in opposite directions
Problem:
Voids in defined area
Emitter and receiver not parallel to each other
Problem:
Reduced excess gain
5.6.4 Installation of Multiple Systems
Whenever two or more S4B emitter and receiver pairs are adjacent to one another, optical crosstalk may take place between
the systems.
To minimize optical crosstalk, alternate the positions of the emitters
on page 24, or alternate scan
codes.
When three or more systems are installed in the same plane, optical
crosstalk may occur between sensor pairs whose emitter and receiver
lenses are oriented in the same direction. In this situation, eliminate
optical crosstalk by mounting these sensor pairs exactly in line with
each other within one plane, or by adding a mechanical barrier
between the pairs as shown in
on page 24.
Figure 10. Optical Crosstalk
Receiver 2
Emitter 2
Receiver 1
Emitter 1
WARNING:
•
Adjacent components can synchronize incorrectly
•
The light curtain's safety function is reduced when components are not synchronized correctly,
creating an unsafe condition that could result in serious injury or death.
•
When multiple systems are mounted closely together, or where a secondary emitter is in view
(within ±5°) and within range of an adjacent receiver, a receiver can synchronize to the signal from
the wrong emitter, reducing the safety function of the light curtain.
To further aid in avoiding crosstalk, the sensors feature two selectable scan codes. A receiver set to one scan code will not
respond to an emitter set to another code. The emitter and receiver within a system must be set to the same scan code.
Scan codes are set via the switches in the removable DES4E-... cordsets on the emitters and receivers. See
on page 28 for the switch settings.
S4B Safety Light Curtain
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