Rockwell Automation MSR42 Curtains Configuration and Diagnostic Software Tool User Manual - Manual (Page 40)

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Light Curtain Multi-Function Control Module User Manual
Original instructions
5.6.2. Muting lamp
A muting lamp should be connected to warn an operator in the event that the light curtain is muted (see details in IEC 62046).
The MSR42 may be configured to monitor a muting lamp. If it is configured with monitoring and the lamp is defective or not connected, the MSR will
not initiate a muting condition, or will discontinue an existing muting condition.
If an error in the muting sequence has occurred, the muting lamp will blink (at 1 Hz), indicating that the muting condition will not be initiated, or has
been discontinued.
If the controller is configured to not monitor the muting lamp, a connected lamp will still work but it will not be monitored. Not monitored means that
if the lamp is defective or not connected the light curtain will still be muted according the muting sequence.
5.6.3. Muting sensors
Mechanical muting sensors must have an opening contact (i.e. N.C.; sensor not activated = contact closed = signal high).
Photoelectric muting sensors do not have 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).
When the material on the pallet has small openings or gaps which can disturb the muting sequence the output signal of the muting sensor signals can be
configured with an output delay time
(See chapter 5.7.5 on page 53).
5.6.4. Mute dependant override function
Normal activation of the manual start button is only permitted if no muting sensors are activated and the light curtain is not interrupted.
An error in the muting sequence will not allow a muting condition. .If the safety light curtain is then interrupted the MSR42’s OSSD outputs will
switch off. This typically leads to a cessation of movement.
In such a case it may not be easy to move the material out of the protected area. If this situation is anticipated (an error in the muting sequence) the start
button may be configured to provide also a mute dependant override function. The MSR42’s OSSD outputs may be reactivated temporarily by
activating the start button (manual start). The maximum allowable duration t(mdo) for this override function can be configured and depends on risk
analysis of the application.
The mute dependant override function is only possible when manual start is configured. Therefore the configuration of a start button is strongly
recommended.
The mute dependant override function should be activated by a push button or a spring loaded key switch. The push button / key switch should be
mounted at a location from which the dangerous area can be seen.
The mute dependant override function is automatically terminated after the mute dependant override time t(mdo) has elapsed (when configured), or
when the safety light curtain is no longer interrupted, whichever occurs first.
5.6.5. Sensor output delay function
Various positions and sizes of loads on the pallet may 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 can be configured. This configuration is only
allowed depending on the application and risk analysis.
Detailed information about muting sensors (e.g. positioning) is given in the standard IEC 62046.
The muting sensors should detect the material on a pallet and not the pallet itself.