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Rockwell Automation Publication 450L-UM001F-EN-P - March 2022
Chapter 4 Safety Function
It must be impossible for a person to pass undetected to the left or right of the
object during the muting process.
Two-sensor T-type Muting with Enable
This muting mode can only be configured with Connected Components
Workbench software. This muting mode is suited for applications when
muting is only possible at certain times; for example, only when a conveyor is
running. It can also be considered when the size and position of the pallet load
is irregular or the size of the pallet is much smaller than the width of the
conveyor. Because only one optical sensor is on either side of the light curtain,
this mode requires an additional enable signal to initiate the muting sequence
(for example, a conveyor run signal). This signal must be low before muting
can be initiated.
Figure 20 - Two-sensor T-type Muting with Enable Arrangement
The height of the two muting sensors must be at the same level as or higher
than the lowest beam of the light curtain.
The distance between S1 or S2 sensors to the light curtain must be sufficient so
that a person's leg cannot activate them simultaneously (>250 mm [9.8 in.]).
A person must not be able to pass undetected to the left or right of the object
during the muting process.
shows the corresponding timing
sequence for such an arrangement.
Figure 21 - Timing Sequence for Two-sensor T-type Muting with Enable
Muting of the light curtain is active only when both enable signal S3 and sensor
S1 in one direction or enable signal S3 and sensor S2 in the opposite direction
are activated simultaneously. There are no timing limitations from when the
S3 signal goes LO to when the applicable muting sensor goes LO.
The object must be long enough to block both sensors.
MS1
MS2
MS3
LC
LC
Machine
Material
Conveyor
Muting Lamp
ESPE
Muting Signal S3
Muting Sensor S1
Mute
t
sens
t
sens
t
espe
t
Mute
t
espe
Muting Sensor S2
