Specifications
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Publication S117-CA001A-EN-P
Presence Sensing Safety Devices
POC Type 4 Safety Light Curtains
2-14
GuardShield
General Principles
2-Opto-electronics
Safety Switches Operator
Interface
Logic Power
R
Up to three GuardShield POC segments can be interconnected.
Patchcord
(2 meter max. length)
Last segment pair
can be cascading or
standard GuardShield pair
GuardShield with Integrated Laser Alignment System
ArmorBlock Guard I/O Connectivity
The upper and lower limit of the protective field is shown by
markings on the housings.
The width of the protective field is derived from the length of the
light path between transmitter and receiver and must not exceed the
maximum rated width of the protective field: 7 m for 14 mm (22.9 ft
for 0.55 in.), 18 m for 30 mm (59.0 ft for 1.18 in.).
Cascading segments are offered in protective heights from
320…1760 mm in both 14 mm and 30 mm resolutions. Cascading
segments of 160 mm are not offered, however; a 160 mm
GuardShield can be used as the last segment in a cascading
system.
A maximum of three GuardShield light curtains can be
interconnected with a common pair of OSSDs. The maximum
number of beams allowed in a cascading system is 528 beams,
which equates to three 1760 mm cascading GuardShields in 14 mm
resolution. The individual segments can have mixed resolutions,
e.g., 14 mm and 30 mm as long as the pairs have the same
protective heights and resolutions.
The response time of a cascading GuardShield system is the
longest response time of any pair in the cascading system. For
example, if the response time of each pair in the cascading system
is 20 ms, then the cascading system's response time is 20 ms.
Cascading segments can be used as standalone light curtain pairs
or can have up to three segments interconnected. These cascading
segments all function as independent light curtains.
Each laser emits a low level of visible light. Simply placing a finger
or opaque object in front of the laser reflects the laser light back to
a photo sensor. This photo sensor causes the laser to switch state
from a barely visible low level of emission to a higher level of
emission of visible light. Interrupting the visible light below the finger
symbol will cause the laser to change state back to a low level of
light emission. The visible light will also change to a low level after
five minutes.
The Integrated Laser Alignment system also quickly helps with the
re-alignment of pairs when units are knocked out of alignment
during the course of the work process or when corner mirrors are
used.
The GuardShield and Cascadable GuardShield are offered in 14 and
30 mm resolutions in protective heights from 320 to 1600 mm. The
160 and 1760 mm protective heights are not offered with the
integrated laser alignment systems.
IMPORTANT
When cascading segments are used as
standalone pairs or as the last segment in a
cascading system, it is necessary to use a
termination plug on the top connector of
the GuardShield cascading receiver. It is
also possible to use a standard
GuardShield Type 4 POC pair as the last
segment in a cascading system.
The GuardShield POC and GuardShield POC cascadable light
curtains are offered with an integrated laser alignment system
consisting of a Class 1, eye safe, constantly powered laser located
in the top of the GuardShield transmitter and at the bottom of the
GuardShield receiver. There are targets located across from each
laser that help facilitate alignment of the light curtain when the laser
is emitting visible light.
The GuardShield POC and GuardShield Cascadable light curtains
are also offered with the Class 1, eye safe, integrated laser
alignment system and connectivity to ArmorBlock Guard I/O. The
receiver of these light curtains has a five-pin M12 quick-disconnect
connector wired to connect to the 1732DS ArmorBlock I/O module,
allowing the GuardShield’s OSSDs to operate over a DeviceNet Safe
network.
This version of the GuardShield has limited configurability, i.e., only
beam coding, fixed and floating blanking can be configured by
setting the appropriate DIP switches and performing the teach
function. EDM, Start/Restart interlock, and the auxiliary output are
not available in these models.
You can use the ArmorBlock Guard I/O with any safety controller
that communicates on DeviceNet using CIP Safety for the control
and monitoring of safety circuits. ArmorBlock Guard I/O detects
circuit failures at each I/O point while providing detailed diagnostics
directly to the controller. With CIP Safety, you can easily integrate
safety and standard control systems by using safety and standard
messages on the same wire.
The 1732DS ArmorBlock Guard I/O family consists of 24V DC digital
I/O modules that communicate on DeviceNet networks.