Specifications

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Publication S117-CA001A-EN-P
Presence Sensing Safety Devices
POC Type 4 Safety Light Curtains
2-13
GuardShield
GeneralPrinciples
2-Opto-electronics
Safety SwitchesOperator
Interface
LogicPower
R
Description
Standard GuardShield
Remote Teach GuardShield
The GuardShield Remote Teach system provides a remote means of
changing a fixed blanking configuration within the GuardShield
safety light curtain. This keyswitch box eliminates the need to open
the GuardShield receiver door and perform the Teach function.
The three-position key switch simulates the opening of the
GuardShield receiver door, teaching the GuardShield light curtain
the new fixed blanking area, closing the door and returning to the
run mode of operation.
The IP65 rated key switch box is provided with a steel mounting
back plate to facilitate mounting of the box in proximity to the
GuardShield receiver. It is necessary to see the receiver LEDs when
performing the teach function.
Cascadable GuardShield System
The Allen-Bradley Guardmaster GuardShield safety light curtain is
an economical, fully featured, Type 4 safety light curtain in a
uniquely styled housing. GuardShield safety light curtains are
general-purpose presence sensing devices designed for use on
hazardous machinery providing point of operation, as well as
perimeter and access guarding. This self-contained, two-box, safety
light curtain has DIP-switch selectable operating modes and is
available in both 14 mm and 30 mm resolutions.
Modes of operation such as fixed and floating blanking, beam
coding, start/restart interlock, external device monitoring (EDM), and
machine test signal, are selected by DIP-switch settings. These DIP-
switches are located beneath a security door, which are
conveniently located on both the transmitter and receiver end caps.
The GuardShield’s torsionally rigid, extruded aluminium,
polyurethane powder-coated housing, combined with an
environmental rating of IP65, allows the GuardShield to be used in
guarding applications across a broad range of industries.
A cascadable GuardShield safety light curtain is a standard
GuardShield safety light curtain in 14 and 30 mm resolutions with
additional M12 connectors located on top of each safety light
curtain. The connector on the top of the safety light curtains allow
the interconnection of up to a total of three pair of GuardShield
safety light curtains with a common pair of OSSDs. The ability to
interconnect GuardShield pairs reduces overall system wiring and
simplifies the safety circuit resulting in a lower overall cost of a
multiple safety light curtain system. This product configurability also
allows a GuardShield safety light curtain system to protect multiple
sides of a machine or simply adds flexibility when positioning
GuardShield in various applications.
The complete cascading GuardShield system has the full
functionality of a standard GuardShield (beam coding, EDM,
start/restart interlock, fixed and floating blanking). There are a
couple of operating modes which can not be configured in the
middle and end segments (EDM and Start/Restart Interlock) and
must only be configured in the host (first) pair. The system will still
have these operating modes active if configured in the host or first
GuardShield pair. This host or first pair is the pair of cascading
GuardShield light curtains, which have the output cordsets
connected and wired to the safety relay, safety PLC or FSDs.
Configuring of the EDM operating mode in the end and middle
segments will cause the system to go to a lock-out condition after
the first interruption of the sensing field. Configuration of the
start/restart interlock operating mode in the end and middle
segments will cause the system to stay in a red condition awaiting
reset after the interruption of the sensing field.
The cascading GuardShield safety light curtains are ordered as pairs
(transmitter and receiver) and are shipped under one cat. no. After
selecting the appropriate pair of cat. nos. for a cascading
GuardShield system, select the interconnecting transmitter and
receiver patchcord cat. nos. to connect the GuardShield pairs. The
transmitter patchcord is a 4-pin M12 patchcord offered in lengths of
1/3 meter, 1 meter and 2 meters. The receiver patchcord is an 8-pin
M12 patchcord offered in lengths of 1/3 meter, 1 meter, and 2
meters.
If the end pair of a cascading system is a cascading pair of
GuardShield light curtains, it is necessary to attach a termination
adaptor to the top M12 connector located on the receiver. Be sure
to order all other required interfaces and accessories.