Rockwell Automation Allen-Bradley GuardShield 450L-B4FNxYD

Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 43
Safety Function Chapter 4
Two-sensor L-type Muting
The sensors and light curtain form the shape of the letter L, when viewed from
the side. The muting sensors (MS) are mounted on one side of the light curtain.
Figure 16 - Two-sensor L-type Muting Arrangement
This muting mode is used to allow a load to exit a dangerous area while helping to
prevent access from outside the dangerous area. The object coming from the
dangerous area interrupts the two muting sensors, which initiates the muting of
the safety light curtain. As the object continues to move through the protective
field, muting remains active until the light curtain is no longer interrupted.
For connecting the sensors, see Table 37 on page 92
and Table 41 on page 94 for
the cascading plug-in.
Figure 17 - Timing Sequence for Two Sensor L-type Muting Arrangement
Muting of the safety light curtain is initiated only after muting sensor MS1 and
MS2 are activated within the specified time t
sens
. The muting condition stops
after t
espe
is exceeded, the light curtain is no longer interrupted, or the maximum
muting time t
Mute
is exceeded (muting timeout), which ever occurs first.
Tabl e 11
shows the default muting and synchronization times. These values can
be adjusted by using Connected Components Workbench software.
Table 11 - Two Sensor L-type Muting Default Settings
Parameter Default Value Parameter Default Value
t
sens
3 s t
mdo
20 s
t
sens
min 50 ms t
espe
3 s
t
Mute
5 min
Machine
MS1
MS2
LC
Muting Lamp
Material
Conveyor
Muted LC
ESPE
Muting Sensor S1
Muting Sensor S2
Mute
t
sens
t
sens
t
espe
t
Mute
t
espe