Rockwell Automation 440L GuardShield Type 4 and Remote Teach User Manual - Manual (Page 10)

GuardShield™ Safety Light Curtain User Manual
8
R
Original instructions
Figure 2: Monitored fixed blanking of in-feed rollers
• Beams are “taught” to ignore the fixed object in the sensing field
• The fixture or object must remain in the sensing field or
GuardShield enters a Fault state
Fixed Blanking enables the blanking out of fixed objects in the sensing
area of the light curtain. The following table shows the reaction of the
monitored machine with Fixed Blanking de­activated and activated.
Floating Blanking
The floating blanking mode of operation is activated through DIP-
switch settings located in the GuardShield receiver. Floating blanking
allows one or two beams located anywhere in the protective field to be
“blanked out” i.e. blocked beam(s) ignored and GuardShield remains
with outputs active.
The following chart depicts the Machine state for one and two beam
floating blanking.
With Floating Blanking up to two light channels can be interrupted.
Note: It is not possible to activate more than one beam floating
blanking on a 30 mm resolution GuardShield system.
Figure 3: Floating blanking
Floating Blanking allows an object to “float” in (move within, or in
and out of) the GuardShield protective field without causing the light
curtain’s outputs to change to the OFF state.
Symbol Description
Beam not interrupted
Beam interrupted
Beam is activated for Fixed Blanking and not interrupted
Beam is activated for Fixed Blanking and interrupted
Work Piece
Roller Work
Path
Fixed Blank
Beam
IMPORTANT
IEC 62046 provides information on additional
means that may be required to prevent an
operator from reaching into the hazard through
the blanked areas of the detection zone.
GuardShield Resolution
Number of Beams
“Floated” Effective Resolution
14 mm (0.55 in.)
1 Beam 24 mm (0.94 in.)
2 Beam 34 mm (1.34 in.)
30 mm (1.18 in.) 1 Beam 50 mm (1.97 in.)
IMPORTANT
Actuation of the floating blanking mode of
operation changes the resolution of the
GuardShield.
IMPORTANT
After each configuration or reconfiguration of a
GuardShield light curtain, test the configuration
of the GuardShield using the appropriate test
piece.