Safety Light Curtain
85
5.2.5.3.1 Conditions of Use
• If a non-hidden beam is covered, this is classed as a penetration and the OSSDs are switched.
• Hidden areas are monitored. Beams must not be detected in this area (“monitored blanking”). I.e. they
must always be covered by the blanking object. If a hidden beam is uncovered, the receiver enters error
state.
• The edge tolerance is ± 1 beam.
• The minimum object size is 2 beams
• The following object movements are tolerated, although they are mutually exclusive (see
):
– Movement by 1 beam up or down.
– Increase in the size of the hidden area by 1 beam.
– Reduction in the size of the hidden area by 1 beam.
• At least 1 synchronization beam and the neighboring beam must not be hidden.
• The distance between two hidden areas depends on their movement within the safety field (
– No object moves: 1 beam distance
– One object moves: 2 beams distance
– Both objects move: 3 beams distance
• There is no limit on the number of hidden areas.
• The hidden areas can be taught-in on the receiver of the ESPE or parametrized via IO-Link.
Taught-in area
Figure 24: Permissible object movement with fix blanking with edge tolerance