Omron F3SG-SRB Series User Manual page 279

Correct installation
The hazardous zone of a machine can be reached
only by passing through the sensor's detection zone.
Incorrect installation
It is possible to reach the hazardous zone of a machine
without passing through the sensor's detection zone.
While working, a person is inside
the sensor's detection zone.
A person is between the sensor's detection
zone and the hazardous zone of a machine.
Wiring and Installation
Safety distance reflects the possible access to the
hazardous zone by reaching over the detection zone.
It is possible to access the hazardous zone
by reaching over the detection zone.
F3SG-SR
User's Manual
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251