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5.4.3 Auto Floating Blanking
This operating mode is required for applications with moving objects which continuously move through and
exit the safety field (e.g. skid carriers and forklifts), thus interrupting specific light curtain beams in a defined
fashion. Intrusions into any other point within the safety field cause the safety output to switch and stop haz-
ardous motion. As opposed to floating blanking, not only is the geometry of the object significant for correct
functioning, but rather entry of the object into the safety field as well. The object enters the safety field via the
uppermost or lowermost light curtain beam. The period of time during which the object is permitted to dwell
within the safety field is limited.
Setup for this function is performed via the serial interface by means of a host PC.
5.4.3.1 Principle
= Active Time Limiting
If the safety field of a light curtain with floating blanking is entirely free of
obstructions, the safety output is not deactivated.
The order in which safety field beams are obstructed must always
start at the top or the bottom.
Only one object can pass through the safety field without causing the
safety output to switch. The beams which are obstructed by the object
are adapted to its size, and are muted accordingly.
There is a limit to the number of beams which can be blanked (see table
1 on page 36).
The period of time during which the object is permitted to dwell within the
safety field is limited
The safety output is switched when additional beams above and beyond
the blanked beams have been interrupted, for example if someone reach-
es into the safety field.
The safety output is switched if the safety field is penetrated at the middle.
