Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 29
Safety Function Chapter 4
Configuration and activation of this mode of operation is through DIP switch
settings. An orange status indicator (RES) on the GuardShield receiver indicates
that the system is ready to be manually started.
Power Cycle
When a GuardShield receiver goes into a lockout state, power must be cycled
after the cause of the lockout has been corrected. The Start input signal and the
Optical Push Button, can be used to cycle power. Press and hold the Start button
or the optical push button between 10...20 seconds. The power cycle function is
available for all start modes, including automatic.
External Device Monitoring
(EDM)
External device monitoring is configurable for both GuardShield product lines.
EDM is an input signal to the GuardShield receiver. It is used to monitor the state
of the primary control contactors of the guarded machinery or other final
switching devices (FSD). The EDM input is looking for a change of state of the
contactors/FSD within a time period of 300 ms before the system faults. A fault
causes the safety light curtain to enter a lockout condition (OSSDs OFF and
error indication). One reason to select the EDM function can be the detection of
an unsafe condition such as welded contacts in one of the FSD. Activation of this
mode of operation is through the DIP switch setting on the GuardShield receiver
plug-in or by enabling this function in the General settings in Connected
Components Workbench™ software.
EDM is not available in GuardShield safety light curtains with ArmorBlock
Guard I/O connectivity (M12 5-pin QD plug-in).
Low Operating Range
Low operating range is designed to minimize the influence of neighboring optical
sensors on the 450L light curtain performance. This feature is available on both
the 450L-B and the 450L-E. Low operating range narrows the operating distance.
The maximum operating distance is reduced, and the minimum operating
distance is increased.
Low operating range is configured by enabling the appropriate DIP switch on the
receiver plug-in, or by enabling the function in the General settings in Connected
Components Workbench software. The default setting is disabled.
The regional intensity status indicators on the transmitter and receiver indicate
the activation of the low range function.
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