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LM, light curtain muting
421
02/16 MN05013001Z EN
Muting
Unlike the LC light curtain function block, this function block
also has the muting function. The muting function makes it
possible to automatically bridge the safety function of the
EPSE for a specific time. This enables goods to be trans-
ported through the hazardous area of the guard without
stopping the cyclical operation.
Two muting sensors fitted in front of the protected area of
the EPSE initiate the bridging:
• They detect entry into the protected area.
• You start the monitoring of the maximum permissible
muting time while the muting contact QM of the function
block indicates the activated muting function.
Optical pushbutton actuators or inductive proximity sensors
are used as muting sensors.
If the sensors determine that the transported material has
not yet left the muting area (muting area including light
curtain) after the maximum permissible muting time MT has
elapsed, the LM..QS enable contact opens and the LM..ER
error contact closes.
Various sensor arrangements can be used. Parallel and
sequential muting are possible.
j
Danger!
Ensure suitable measures for preventing danger to
persons or objects during muting.
j
Danger!
The bridging must also be removed automatically after the
material has passed through and the guard must be
restored to function.
h
The illustrations below of light curtain muting the basic
sensor arrangements.
For the exact arrangement of the sensors for each applica-
tion, see the (preliminary) standard IEC/TS 62046 02/
2008.
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