Rockwell Automation MSR42 Curtains Configuration and Diagnostic Software Tool User Manual - Manual (Page 31)

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Light Curtain Multi-Function Control Module User Manual
Original instructions
5.4.8.2. Override One Device (OSSD)
Figure 40: Specification window “Safety override”
This function shows how to override a safety device with OSSD outputs (e.g GuardShield Safe 4). The MSR42 safety controller will be configured with
Manual Start (Reset). Therefore for In1 or In2 the option ‘Start’ must be selected.
One method can be selected to override an OSSD device:
1. PNP signals (cross fault monitored) (For special applications it is also possible that the two safety override switch signals are replaced by two
safety signals (e.g. a safety PLC gives a maintenance signal that the machine should run at a lower speed for service purposes). In such an
application a key switch must still be placed in series with the two safety signals. Only when the key switch is activated and the safety signals are
“high,” will the safety override function be active.)
The opening of only one contact will lead to a stop of the override function within the reaction time of the control unit. The override function can only
be re-activated after both contacts (or signals) have been opened (or deactivated) at the same time.
5.4.9. Muting Micro 400
Certain applications in practice require that the protective field of the Micro 400 light curtains need to be muted “automatically” without the safety
contacts opening. A typical example of such an application is a conveyor belt. It should be possible to transport the goods on a pallet through the
protective field without stopping the pallet movement.
It must be made sure that a short circuit of one of these safety signals to ground, to +24V DC or between each
other must be detected by the external safety controller and once detected this external safety controller has
to immediately stop the dangerous machine movement.
When the safety prevention switch contacts are closed and the MSR42 control unit is powered up, the safety
override function will be immediately active.