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BLANKING (SH4-XX-XXXX-X models only)
Blanking is an auxiliary function of safety light curtains for which the introduction of an
opaque object inside part of the light curtain's protection field is allowed without going
in OFF status. Blanking is only possible in the presence of determined safety conditions
and in accordance with a configurable operating logic.
The blanking function is therefore particularly useful when the light curtain's protection
field must be inevitably intercepted by the material being worked or by a fixed or
mobile part of the machine. In practice, it is possible to keep the light curtain's safety
outputs in ON status, even if a pre-determined number of beams within the protection
fields is being intercepted.
Inside each blanking zone only one object intercepting adjacent beams can be present
without triggering the safety function.
For each blanking zone two parameters (minimum size and maximum size) characterize
the object that can be inserted in the zone without triggering the safety function. If the
object is smaller or larger than these two parameters, it will trigger the safety function.
When maximum and minimum size are equal (thus, there is no tolerance on the size of
the object) light curtain effective resolution remains the same as the optical resolution.
NOTE: A maximum of 5 blanking zones may be defined on light curtain.
BLANKING ZONE 2
BLANKING ZONE 1
Figure 61: Blanking Zones
NOTE: Each blanking zone is defined by a starting beam and a Zone size.
NOTE: The first or the last beam of the light curtain must be excluded from
the blanking zones.
NOTE: Effective resolution can be calculated as:
For 14 mm = 14 + (max size - min size)*10
For 30 mm = 30 + (max size - min size)*25
BLANKING (SH4-XX-XXXX-X MODELS ONLY)
BLANKING ZONE 2:
Start beam:8
End beam:11
Zone side: 4
Object minimum:4
Object maximum:4
BLANKING ZONE 1:
Start beam:2
End beam:5
Zone side: 4
Object minimum:1
Object maximum:2
PRODUCT REFERENCE GUIDE
81
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