Safety Light Curtains

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PAC Type 4 GuardShield PAC

Introduction Specifications Product Selection Approximate Dimensions Wiring Diagram for Connection of OSSDs Directly to Contactors (FSDs)
Click to enlarge - 440L-P4A3400YD_Product_Iso_4C


Description

Standard GuardShield PAC

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%.

Click to enlarge - 440L-P4A3400YD_Diagram 01


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.

GuardShield PAC with Integrated Laser Alignment System

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.

ArmorBlock® Guard I/O Connectivity

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.

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