44 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 4 Safety Function
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.
It has to be impossible for a person to pass undetected to the left or right of the
object during the muting process.
Two-sensor L-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
should only be 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 18 - Two-sensor L-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. Figure 19 on page 45
shows the corresponding timing
sequence for such an arrangement.
Machine
MS1 MS2
MS3
LC
LC
Muting Lamp
Conveyor
Material
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