Rockwell Automation Publication 450L-UM001F-EN-P - March 2022
39
Chapter 4 Safety Function
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 18 - 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
for
the cascading plug-in.
Figure 19 - 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.
shows the default muting and synchronization times. These values can
be adjusted by using Connected Components Workbench software.
The two-sensor L-type muting arrangement must only be used for material
that exits the hazardous area. It must not be used for material that enters the
hazardous area.
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
MS1 MS2 LC
Machine
Material
Conveyor
Muting Lamp
Mu
te
d LC
ESPE
Muting Sensor S1
Muting Sensor S2
Mute
t
sens
t
sens
t
espe
t
Mute
t
espe
