• As a tripping device to initiate or reinitiate machine motion (PSDI applications), unless the machine and its control
system fully comply with the relevant standard or regulation (see OSHA 29CFR1910.217, ANSI/NFPA 79, ANSI
B11.19, ISO 12100, IEC 60204-1, IEC 61496-1, or other appropriate standard)
If an EZ-SCREEN LS is installed for use as a perimeter guard (where a pass-through hazard may exist, see
Reducing or
Eliminating Pass-Through Hazards
), the dangerous machine motion can be initiated by normal means only after the
safeguarded area is clear of individuals and the safety related part of the control system that is providing the latching
function has been manually reset.
3.1.3 Control Reliability: Redundancy and Self-Checking
Redundancy requires that EZ-SCREEN LS circuit components be backed up to the extent that, if the failure of a single
component will prevent effective machine stopping action when needed, that component must have a redundant
counterpart which will perform the same function. The EZ-SCREEN LS is designed with redundant microprocessors.
Redundancy must be maintained whenever the EZ-SCREEN LS is in operation. Because a redundant system is no longer
redundant after a component has failed, EZ-SCREEN LS is designed to monitor itself continuously. A component failure
detected by or within the self-checking system causes a stop signal to be sent to the guarded machine and puts the EZ-
SCREEN LS into a Lockout condition.
A recovery from this type of Lockout condition requires:
• Replacement of the failed component (to restore redundancy)
• The appropriate reset procedure
The Diagnostic Display is used to diagnose causes of a Lockout condition. See
3.2 Components
3.2.1 Models
An EZ-SCREEN LS “System” refers to a compatible emitter and receiver of equal length and resolution (available in pairs or
separately), including cascaded sensors, and their cordsets. Mounting hardware is included with each emitter and receiver.
Special-purpose mounting brackets both for standalone pairs and for cascades are also available. Depending on the
connection option, interfacing solutions include IM-T-.. modules, redundant positively guided contactors, safety modules/
controllers, and muting modules.
The 13 mm (0.5 in) minimum bend radius for all cordset models accommodates low-clearance installations; cords can exit
to the left, right, or back of the sensor, when mounting. The pigtail QD option is useful for connection to splitter cables or
other QD cordsets.
Defined
Area
Test
RD Cordset
Emitter
Receiver
Status Indicators
visible on sensor face
Figure 1. EZ-SCREEN LS System: Emitter, Receiver, Interconnecting
Cordsets
Euro QD Termination
Pigtail; requires mating QD
cordset for machine
connection
RD to RD cordset options are available
for compact sensor-to-sensor
connections
RD cordset with flying leads
Cable pivots as it exits
housing; bends to fit
against perpendicular
surfaces.
R 13 mm [0.5"]
min. bend
Figure 2. EZ-SCREEN LS cordset options
EZ-SCREEN LS Pair model numbers include the following items:
EZ-SCREEN
®
LS Safety Light Screen
12
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