Distance From Reflective Surfaces; Mutual Interference Prevention - Omron F3SJ-E N25 Series User Manual



Distance from Reflective Surfaces

Install the sensor system so that it is not affected by reflection from a glossy surface.
Failure to do so may hinder detection, resulting in serious injury.
Install the sensor system at distance D or further from highly reflective surfaces such as metallic walls,
floors, ceilings, or workpieces, as shown below.
Reflective ceiling
Emitter
Detection zone
Reflective floor
Distance between an emitter and a
receiver (operating range L)
0.2 to 3 m
More than 3 m
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Mutual Interference Prevention

Mutual interference is prevented in up to three sets, using interference light detection and cycle shift
algorithm.
If four or more sets of F3SJ-E/Bs are installed, arrange them so that mutual interference does not
occur. If two sets are installed near each other, reflection from the surface of the F3SJ-E/B may cause
mutual interference. When mutual interference occurs, the safety outputs are turned OFF in a moment
or the F3SJ-E/B enters lockout state.
Combining countermeasures 1 to 3 shown below is effective.
1.
Install a physical barrier between two sets
D
Emitter
Receiver
L
D
Allowable installation distance D
0.13 m
L/2 x tan5° = L x 0.044 (m)
Emitter Receiver
Reflective surface
D
5° 5°
L
Emitter Receiver
Wiring/Installation
Receiver
F3SJ-E/B
User's Manual
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