Specifications

Visit our website: www.ab.com/catalogs
Publication S117-CA001A-EN-P
Presence Sensing Safety Devices
PAC Type 4 Safety Light Curtains
2-56
GuardShield PAC
General Principles
2-Opto-electronics
Safety Switches Operator
Interface
Logic Power
R
Description
Standard GuardShield PAC
GuardShield PAC with Integrated Laser Alignment System
ArmorBlock Guard I/O Connectivity
Features
 Beam coding
 External device monitoring (EDM)
 Machine test signal
 Start/restart interlock
Industries
 Material handling
 Packaging equipment
 Automotive
 Robot cells
The GuardShield PAC light curtains are also offered with the
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 allow connection to the
1732DS ArmorBlock I/O module. This connectivity of the
GuardShield PAC receiver allows the GuardShield’s OSSDs to
operate over a DeviceNet Safe network.
This version of the GuardShield has limited configurability, i.e., only
beam coding can be configured by setting the appropriate DIP
switches and performing the teach function. EDM, Start/Restart
interlock as well as the auxiliary output are not available in these
GuardShield PAC models.
The ArmorBlock Guard I/O can be used 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.
The GuardShield PAC safety light curtain is designed for whole body
detection and is currently offered in two configurations: two beams
at 500 mm spacing and three beams at 400 mm spacing.
The Allen-Bradley Guardmaster GuardShield Perimeter Access
Control (PAC) safety light curtain is a multiple beam, short range
(0.3…16 m), Type 4 safety light curtain typically used to provide
access detection at machine entry points. It is also possible to use
the GuardShield PAC in perimeter guarding applications as an
optoelectronic fence as long as the perimeter distance does not
exceed the maximum range of 16 meters. Note that when using the
GuardShield PAC with corner mirrors for multiple sided guarding,
each mirror reduces the maximum scan range of 16 meters by
approximately 15%.
The GuardShield PAC 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 PAC transmitter
and at the bottom of the GuardShield PAC receiver. There are
targets located across from each laser which help facilitate
alignment of the light curtain when the laser is emitting visible light.
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.