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R
E
Carrier Basket
M1
Fixed Guarding
M2
Light Screen
Safety Mat
A
D
Safe Area
Hazardous Area
Figure 33. Exit Application with 1-Way Muting using two opposed-mode sensors (Configurations #7 and #8)
A ≥ Line speed (ft/sec) × 0.1 sec.
D < Line speed (ft/sec) × 4.0 sec.
Length of carrier basket > D
Note: Light screen must be blocked before M1 clears.
8.1.2 Home or Station Applications
The muting devices must be placed to ensure that the safety light screen is muted only when the hazard does not exist or is
in another area so that personnel are not exposed. The muting devices must be placed so that if a hazard arises, or the
hazard enters the safeguarded area, the mute will immediately end and the safeguard will be active once again.
In home position muting applications, the light screen is active only while motion is taking place or a hazard is present, such
as the closing of an automated door. In this example, the door is interlocked and the machine can not start until the opening
is completely closed. The hazard being guarded by the light screen is the pinch point caused by the door closing.
M3 and M4 could be two SI-QS75MC safety switches, each with a single safety contact used for the muting input. M1 and
M2 could be SI-QS90MF safety switches, each with two safety contacts (one for muting and one for interlocking) and one
monitoring contact for a logic input.
If the light screen is also guarding hazards within the enclosure when the door is open or preventing cycle initiation, then
switches M3 and M4 would not be used. The door could also be locked by using locking style safety switches, such as the
SI-LS42 as M1 and M2.
EZ-SCREEN Low-Profile System with Integral Muting
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