Reer JANUS - MUTING FUNCTION; Muting Function Purpose; ML Series Muting Operation

8540573 • 16/09/2016 • Rev.20 5
MUTING FUNCTION

The Muting function is a temporary suspension of the safety light curtain’s protective
function. Carefully check your risk analysis in order to assess whether the Muting function
is compatible with your application and what additional measures have to be taken.
The Muting function generates a temporary, automatic interruption of safety light curtain
functioning in order to permit normal transit of material through the guarded opening.
The Muting function is activated when the system detects the object that interrupts the opening
protected. In other words, when the system recognizes the material and distinguishes between
this and any operator (in a potentially dangerous situation), it is enabled to bypass the light
curtain temporarily, allowing the material to pass through the opening.
The Muting sensors – which can be integrated in the light curtain (models "ML" and "MT") or be
external (model "MI") – form the sensing system that decides whether the Muting function is to
be activated (or not). Control of the dangerous opening can be de-activated only by a correct
sequence of interruption of the beams of the Muting sensors.
The JANUS system is available in the “ML" and "MT” models (with 2 integrated opto-electronic
sensors) and "MI" models to which 2 or 4 sensors of various type can be connected (proximity,
optical, capacitive etc).
SERIES "ML" - PREASSEMBLED KIT OF JANUS LIGHT CURTAIN AND SENSOR ELEMENT “ML S”
Integrated Muting sensors – only for one-way openings with pallet exit.
In this model, the sensors 1 and 2 are on the same side of
the vertical light curtain and are placed in front of the
guarded opening (Figure 2).
This model is one-way and is useful for protecting pallet exit
openings.
The Muting function is activated following concurrent
interruption (within max. 4 sec) of sensors S1 and S2. The
Muting function remains active as long as both sensors
remain occupied.
When the first of the 2 sensors is cleared, the material has
four seconds to abandon the guarded area delimited by the
light curtain. The Muting condition will be disabled as soon
as the protected area is cleared.
After 4 seconds, if the light curtain is still occupied, the
OSSD outputs are disabled, interrupting functioning of the
machine. For this model, the maximum duration of the
Muting condition (timeout) can be set to 30 seconds or 90
minutes.

To guarantee the safety operation of the ML
series, the horizontal muting sensor must be
mounted INSIDE the dangerous area
(dashed on Figure 2).

When using a ML series JANUS, the minimum
distance between two consecutive pallet must
be less than 10cm or more than 32cm.
Figure 2
Emitter
Receiver
Sensor 1
Sensor 2
D
D
A
A
N
N
G
G
E
E
R
R
O
O
U
U
S
S
A
A
R
R
E
E
A
A