6
Operating instructions
Safety light curtain / safety light grid
SLC440 Series
SLG440 Series
EN
2.9.4 Fixed blanking SLC 440
The SLC440 can blank stationary objects in the protection field
Multiple protection field areas can be blanked If small changes
are made within the fixed blanking area, each time 1 beam can be
additionally blanked to increase the tolerance See chapter Parameter
setting - Fixed blanking with movable edge regions (P 2)
Fixed blanking area
E1
R1
Key
E1
R1
Object in protection field
E1
R1
mechanical cover
The range of the fixed blanking can be arbitrarily chosen in the
protection field
The first beam line, which realises the optical synchronisation and is
located immediately behind the diagnostic window, cannot be blanked
The area of the fixed blanking must not be modified after the teach-
in process Any change of the area or removal of the object from the
protection field will be detected by the system As a result, the outputs
are disabled (locked) This locking can be neutralised by executing a
new teach-in process in accordance with the actual beam interruptions
The function is activated by means of the parameter setting
(P1) If the function is activated, the LED blanking in the
diagnostic window of the receiver starts flashing See chapter
Parameter settings
• The remaining lateral areas must be protected against intru-
sion by means of mechanical covers
• The lateral covers must be fixed with the object
• Partial covers are not authorised
• After the fixed blanking, the protection field must be tested
by means of the test rod
• The restart interlock function of the safety light curtain or the
machine must be activated
2.9.5 Fixed blanking with movable edge region (SLC440 only)
This function can compensate slight position changes of one to two
fixed blanked objects with a change of ± 1 beam This position change
corresponds to an amplitude of approx ± 10 mm resolution 14 mm and
approx ± 20 mm resolution 30 mm upwards and downwards in the
protection field
Example of beam blanking (object in protection field)
Beam number
3 4 5 6 7 Status OSSDs
Fixed blanking, beam 4, 5 and 6
●
● ●
● ●
● ●
● ●
●
Teach In
Shift 1 beam down
●
● ●
● ●
● ●
● ●
●
ok
Shift 1 beam up
●
● ●
● ●
● ●
● ●
●
ok
Object only covers 2 beams
●
● ●
● ●
● ●
● ●
●
ok
Object only covers 2 beams
●
● ●
● ●
● ●
● ●
●
ok
Object with downward edge
displacement
●
● ●
● ●
● ●
● ●
●
ok
Object with upward edge
displacement
●
● ●
● ●
● ●
● ●
●
ok
Object displacement exceeds
1 beam
●
● ●
● ●
● ●
● ●
●
Error
Object size changed (1 beam)
●
● ●
● ●
● ●
● ●
●
Error
Object size changed (5 beams)
●
● ●
● ●
● ●
● ●
●
Error
The operating mode is only available, when the parameter setting -
fixed blanking with movable edge region is activated (P 2) See chapter
Parameter setting
A combination with only fixed beam blanking (P 1) or additional floating
beam blanking (P 3) is not possible
This blanking changes the physical resolution The effective resolution
of the SLC440 can be found in the table in the chapter "Floating
blanking" (1 beam)
Perform a new calculation of the safety distance with the
effective resolution Adjust the safety distance in accordance
with your calculation
2.9.6 Floating blanking SLC440
The SLC440 safety light curtain can blank movable objects in the
protection field
The SLC440 can be used for the floating blanking of 2 beams in the
protection field, refer to parameter setting (P 3) A combiniation of fixed
and floating beam blanking (P 1 and P 3) is enabled
A combination of fixed blanking with movable edge region (P 2) and
floating blanking (P 3) is not possible
Example
Floating and fixed blanking
2
1
Cylinder for material ejection
Key
1: Fixed blanking area
2: Floating blanking area
The function enables an arbitrary floating blanking of partial areas in the
protection field The first beam, which is located immediately behind the
diagnostic window, cannot be blanked
This function allows an interruption of the protection field without the
outputs being disabled in case of material movement in the protection field
