Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 47
Safety Function Chapter 4
The muting sensors MS1-MS4 detect the objects on pallets and not the pallet
itself. When this action is impractical, additional measures can be necessary to
deter people from entering the zone by sitting on the pallet.
Figure 21 - Timing Sequence for Four Sensor Muting
Muting of the 450L-E safety light curtain is achieved only when muting sensor
MS1 and MS2 are activated within the specified time t
sens
. The delay between
the sensors must be larger than t
sens
minimum. For a successful muting sequence,
all four sensors must be simultaneously activated for a certain time period.
The muting condition stops when either sensor MS3 or MS4 is deactivated, or
the maximal muting time t
Mute
is exceeded (muting timeout). Since this muting
mode is bidirectional, the muting sensor sequence also functions in reverse (such
as MS4 =>MS1).
Tabl e 13
shows the default time limits. These values can be adjusted by using
Connected Components Workbench software.
Table 13 - Four Sensor T-type Muting Default Time Limit Settings
A time t
sens
of 4 s is recommended in IEC 62046.
The behavior of the muting lamp indicator is analogous to the behavior described
in Two-sensor T-type Muting on page 41
.
It is not possible for a person to pass undetected to the left or right of the object
during the muting process.
Parameter Default Value
t
sens
4 s
t
sens
min 50 ms
t
Mute
5 minutes
t
mdo
20 s
t
espe
5 s
ESPE
Muting Sensor S1
Muting Sensor S2
Mute
t
sens
t
sens
t
espe
t
Mute
t
espe
Muting Sensor S3
Muting Sensor S4
To Next Page
Loading...