Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 39
Safety Function Chapter 4
Each of these functions can be configured with manual or automatic reset.
Muting Lamp
Depending on the risk assessment of the application, a muting lamp is necessary
to warn an operator when the light curtain is muted (see details in IEC 62046).
The muting lamp is on when the light curtain is muted.
If an error in the muting sequence has occurred, the muting lamp blinks (see
Troubleshoot on page 116
), which indicates that the muting condition is not
initiated, or has been discontinued.
Muting Sensors
Mechanical muting sensors must have an opening contact. For proper operation,
the muting sensors are on (normally closed) if the safety light curtain is not
muted.
The safety relay, the 450L-E safety light curtain, and the muting sensors must
have the same reference (24V Com) for proper operation.
Photoelectric muting sensors do not need to be certified according to safety type
2 or 4 of IEC 61496-1/-2. The detection zone of the muting sensors must be
within 30° of the horizontal and are mounted at a height suitable to detect a
person's leg (see IEC 62046).
Various positions and sizes of materials on the pallet can make it difficult to
guarantee an uninterrupted muting signal over the entire passage through the
guarded area. For this reason, an off-delay time t(msdel) for the muting sensor
inputs and the light curtain is set to 50 ms.
IMPORTANT The safety function block muting must be set to manual reset. In case the
safety light curtain is set to automatic start, the safety relay or the safety PLC
manages the manual reset.
IMPORTANT Detailed information about muting sensors (for example, positioning) is
given in the standard IEC 62046.
IMPORTANT The muting sensors detect the material on a pallet and not the pallet itself.
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