Rockwell Automation Allen-Bradley Guardmaster GuardShield Type 4 User manual

Installation Instructions
Original Instructions
GuardShield Type 4 and GuardShield Remote Teach
Catalog Numbers 440L-P4zxxxxyy , 440L-C4xxxxyy, 440L-S4xxxxyy
Summary of Changes
This publication contains new and updated information. Changed 18m
range to 16 m in the Technical Specifications on page 22.
Description
This installation instruction covers the operation and installation of the:
• Standard and cascading GuardShield light curtain
• Remote Teach GuardShield light curtain
• GuardShield light curtain with Integrated Laser Alignment
• GuardShield light curtain with Integrated Laser Alignment and
ArmorBlock® Guard I/O™ module
Recognized technical regulations and quality assurance system ISO
9000 are carefully applied during the development and production of
Allen-Bradley/Guardmaster® products.
This technical description must be followed when installing and
commissioning the GuardShield light curtain. A qualified person
conducts the inspection and commissioning.
We reserve the right to make changes or revisions to the material
contained in this publication. Rockwell Automation cannot be held
liable for incidental or consequential damages, which result from the
furnishing, performance, or use of this material.
GuardShield Safety Light Curtain
The GuardShield family of safety light curtains is a general-purpose
presence sensing device, which is designed for use on hazardous
machinery providing point of operation, and perimeter and access
detection.
It is a self-contained, two-box, Type 4 electro sensitive protective
equipment (ESPE) with DIP switch selectable operating modes.
The GuardShield light curtain is offered in a number of configurations
that are based on a standard Type 4 safety light curtain platform.
Table 1 - Features
Some of the features are available in combinations. For a complete
offering, see Table 48…Table 53 on pages 22…25 and Table 62 on
page 31.
According to ANSI Z590.3, Z690.3, ISO 14121, and ISO 12100, the
GuardShield light curtain Type 4 may be used in safety applications in
which a risk analysis has reached:
• PLe in a safety Category 4 (EN ISO13849-1)
• SIL 3 (EN 62061)
Topic Page
GuardShield Safety Light Curtain 1
Safety Precaution Principles 2
Specialist Personnel 2
Product Description 3
Determine the Safety Distance 8
Installation and Mounting 10
Configuration of Operating Modes in Cascading Systems 12
Electrical Installation Power Supply 14
System Configuration 17
Troubleshooting Guide 18
Safety Instructions—Maintenance 20
Technical Specifications 22
GuardShield Light Curtain Remote Teach 29
System Delivery 30
Disposal 36
Certification 37
Compliance to European Union Directives 37
IMPORTANT Save these instructions for use at a future time.
Feature Description
Integrated laser alignment An integrated visible laser to support the alignment
Cascade Cascade allows the serial connection of several
GuardShield light curtain segments to one long system
Remote Teach Provides a remote teach-in box to configure teach-in
blanking
ArmorBlock Guard I/O module
connectivity For network connectivity

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GuardShield Type 4 and GuardShield Remote Teach
Features of the GuardShield light curtain, which are integrated into the
system receiver:
• Fixed blanking
• Floating blanking
• External device monitoring (EDM)
• Internal or external restart
• Beam coding
• Laser alignment (option)
Safety Precaution Principles
The following instructions are preventive warnings to achieve the safe
and proper operation of the GuardShield light curtain. These
instructions are an essential part of the safety precautions and therefore
have to be observed at any time.
Throughout this manual we use the labels ATTENTION and
IMPORTANT to alert you to the following:
ATTENTION: Identifies information about practices of circumstances
that can lead to personal injury or death, property damage, or economic
loss.
ATTENTION helps you:
• Identify a hazard,
• Avoid a hazard,
• Recognize the consequences
IMPORTANT: Identifies information that is especially important for
successful application and understanding of the product.
Specialist Personnel
Only a qualified person can install the GuardShield safety light curtain.
A qualified person is defined as a person who:
• Has undergone the appropriate technical training
• The responsible machine operator has instructed in the
operation of the machine and the currently valid safety
guidelines
• Who has read and has ongoing access to these installation
instructions
Range of Uses of the Device
The GuardShield safety light curtain is classified as ESPE. The physical
resolution is 14 mm (0.55in.) or 30 mm (1.18 in.). The maximum
protective field width is 7m (22.9 ft) for the 14 mm (0.55 in.)
resolution and 16 m (52 ft) for the 30 mm (1.18 in.) resolution
GuardShield light curtain. The protective field height is between 160
mm (6.3 in.) and 1760 mm (69.2 in.) in increments of 160 mm.
The GuardShield light curtain with an Integrated Laser Alignment
system is offered in protective heights from 320…1600mm (12.6…63
in.). All GuardShield light curtains with ArmorBlock Guard I/O
module have Integrated Laser Alignment.
The device is a Type 4 ESPE as defined by IEC 61496-1 and
IEC61496-2. Therefore it is allowed for use with controls:
• In safety Cat 4 up to PLe in accordance with EN ISO 13849-1
• SIL CL3 in accordance with EN 62061
The device is suitable for:
• Point of operation protection (finger and hand protection)
• Hazardous area protection
• Access protection
Access to the hazardous point must be allowed only through the
protective field. The machine/system is not allowed to start as long as
IMPORTANT These installation instructions are designed to address the
technical personnel of the machine manufacturer and or the
installer of the safety system regarding:
• Proper mounting
• Configuration
• Electrical installation
• Commissioning
• Operation
• Maintenance of the GuardShield safety light curtain
These installation instructions do not provide instruction for
the operation of machinery to which the GuardShield safety
light curtain is integrated. Only qualified personnel can install
this equipment.
ATTENTION: Failure to observe can result in dangerous operation.
ATTENTION: A potentially hazardous situation exists, which, if not
stopped, can lead to serious or deadly injury.
Failure to observe can result in dangerous operation.
ATTENTION: The GuardShield light curtain must not be used with
machines that cannot be stopped electrically in an emergency.
The safety distance between the GuardShield light curtain and a
dangerous machine movement has to be maintained always.
Additional mechanical protective devices have to be installed in a
way that hazardous machine elements cannot be reached without
passing through the protective field.
The GuardShield light curtain has to be installed in a way that
operators can only operate within the sensing area.
Improper installation can result in serious injury.
Never connect the outputs to +24V DC. If the outputs are
connected to +24V DC, they are in ON-state and cannot stop
hazardous spots at the machine/application.
Never expose the GuardShield light curtain to flammable or
explosive gases.
Regular safety inspections are imperative (see maintenance).
Do not repair or modify the GuardShield light curtain. The
GuardShield safety light curtain is not field repairable and can only
be repaired at the factory. Removal of either of the GuardShield
light curtain endcaps voids the warranty terms of this product.

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 3
GuardShield Type 4 and GuardShield Remote Teach
personnel are within the hazardous area. See the Examples of Range of
Use on page 3 for an illustration of the protective modes.
Depending on the application, mechanical protection devices can be
required and the safety light curtain.
Proper Use
The GuardShield safety light curtain must be used only as defined in the
Range of Uses of the Device on page 2. It is only used by qualified
personnel and only on the machine that’s installed and initialized by
qualified personnel.
If the device is used for any other purposes or modified in any way,
warranty claims against Allen-Bradley/Guardmaster become null and
void.
General Protective Notes and Protective Measures
The national/international rules and regulations apply to the
installation, use, and periodic technical inspections of the safety light
curtain, in particular:
• Machine Directive 2006/42/EC
• Low Voltage Directive 2006/95/EC
• The work safety regulations/safety rules
• Other relevant health and safety regulations
Manufacturers and users of the machine with which the safety light
curtain is used are responsible for obtaining and observing all applicable
safety regulations and rules.
• The notices, in particular the test regulations of these
installation instructions (for example, on use, mounting,
installation, or integration into the existing machine controller)
must be observed.
• Specialist personnel or specially qualified and authorized
personnel conduct the tests and record/document the tests to
be sure that they can be reconstructed and retraced at any time.
• The installation instructions must be made available to the user
of the machine where the GuardShield safety light curtain is
installed. The machine operator is to be instructed in the use of
the device by specialist personnel and must be instructed to read
the installation instructions.
Examples of Range of Use
The GuardShield safety light curtain operates as a proper protective
device only if the following conditions are met:
• The control of the machine must be electrical.
• The controlled machine must be able to be stopped anywhere in
the machines stroke or cycle.
• The transmitter and receiver must be mounted such that access
to the hazard is only through the light curtain protective field.
• The restart button must be located outside the hazardous area.
This location removes the possibility of operation by a person
working inside the hazardous area.
• The statutory and local rules and regulations must be observed
when installing and using the device.
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O module connectivity.
Product Description
This section provides information on the special features and properties
of the safety light curtain. It describes the structure and functions of the
unit, in particular the different operating modes.
Special Features
• Start interlock
• Restart interlock
• Teachable fixed blanking
• One or two beam floating blanking
• External Device Monitoring (EDM)
• Machine test signal
• Beam coding
GuardShield Light Curtain Principle of Operation
The GuardShield safety light curtain consists of a non-matched pair of
optic units, for instance, transmitter and receiver (see Figure 1 on
page 4) with the same protective height and resolution. The transmitter
and receiver operate on +24V DC. The maximum distance between
transmitter and receiver is referred to as the protective field width or
range. The protective field height is the distance between the first and
last beam in the device.
The transmitter emits sequential pulses of infrared light, which the
GuardShield light curtain receives and processes. The first beam next to
the status indicators synchronizes optically the timing of emission and
reception of the infrared light pulses. This beam is referred to as the
synchronization beam. Because the GuardShield light curtain
transmitter and receiver are optically synchronized, no electrical
connection is required between the transmitter and receiver.
The GuardShield light curtain receiver has two safety outputs, Output
Signal Switching Devices (OSSDs) and one nonsafety auxiliary output.
When the GuardShield light curtain transmitter and receiver are
properly powered and aligned, all OSSDs are current sourcing +24V
DC with a switching capacity of 500mA. The two safety OSSDs are
cross monitored and have short circuit protection. Interruption of the
sensing field causes the receiver to switch the sourced current OFF
(0VDC).
IMPORTANT Observe the following items to be sure the proper and safe use
of the GuardShield safety light curtain.
IMPORTANT Additional measures can be necessary to be sure that the ESPE
does not fail to danger when other forms of light radiation are
present in a particular application. For instance, with cableless
control devices on cranes, radiation from weld spatter, or
effects from strobe lights use.
IMPORTANT Read this section before mounting, installing, and
commissioning the unit.

4Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
When you restore the sensing field in Guard only (automatic reset)
configuration, it causes the OSSD safety outputs to switch from the
OFF to the active high ON state (+24V DC).
Figure 1 - Components of a Standard GuardShield Light Curtain
Safety System
Figure 2 - Components of a Cascaded GuardShield Light Curtain
System(1)
The black front window indicates the upper and lower limit of the
protective field of the standard GuardShield light curtain system.
The yellow borders on the laser label and target label indicate the limits
of the protective height on the GuardShield light curtain with an
Integrated Laser Alignment system.
The width of the protective field is derived from the length of the light
path between sender and receiver. This width must not exceed the
maximum rated width of the protective field that is provided in the
Technical Specifications on page 22.
Cascading
The GuardShield light curtain, Type 4 POC is also available in cascade
segments which allow a number of GuardShield light curtain
transmitters and receivers to be interconnected in series (see Figure 2).
This product configurability allows the GuardShield light curtain to
protect multiple sides of a machine or simply adds flexibility when
positioning the GuardShield light curtain in various applications.
Standard GuardShield light curtain cascade segments are offered in
protective heights from 320…1760 mm (12.6…69.29 in.) in both 14
mm (0.55 in.) and 30mm (1.18 in.) resolutions. Cascade segments of
160 mm (6.3in.) are not offered, however a 160 mm GuardShield light
curtain can be used as the last segment in a cascading system.
Cascading GuardShield light curtains with an integrated laser alignment
system are offered in protective heights from 320…1600mm (12.6…63
in.). It is possible to mix standard GuardShield light curtains with
integrated laser alignment systems.
A maximum of three GuardShield light curtains can be interconnected
with a common pair of OSSDs. There are no limitations for the total
number of beams in a cascading system. And the maximum number of
beams possible is in three 1760mm (69.29 in.), 14mm (0.55 in.)
resolution GuardShield light curtain interconnected segments. The
individual segments can have mixed resolutions, for instance, 14mm
and 30mm (1.18 in.) as long as the pairs have the same protective
heights and resolutions.
Cascade 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.
When cascade segments are used as standalone pairs or as the last
segment in a cascade system, it is necessary to use a termination plug on
the top connector of the cascade receiver. It is also possible to use a
standard GuardShield light curtain Type 4 POC pair as the last segment
in a cascading system.
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O module connectivity.
GuardShield Light Curtain Laser Alignment
The laser light source in the Integrated Laser Alignment system of the
GuardShield light curtains is a Class 1, eye safe laser diode with a
wavelength of 670 nm.
This Class 1, eye safe laser is switched from a low output power state to a
high output power state (and back again) with control circuitry. It
detects reflected laser light from a temporary blockage of the emitted
laser light. This detection is most commonly accomplished by placing a
finger over the laser overlay window. There is also an automatic
shutdown feature. This feature switches the laser diode from the high-
power state to the low-power state if there is no finger or other
interruption that is detected for five minutes.
During the high output mode of operation, the laser is pulsed at a rate of
approximately 2 Hz to facilitate finger detection in high ambient light
conditions.
Safety Functions
The GuardShield safety light curtain offers various functions, which are
integral to the system.
Operating modes, functions, and features of the GuardShield light
curtain system are activated through DIP switch settings.
Guard Only (Automatic Reset)
When in the guard only mode of operation, the light curtain operates as
an on/off device. This operation means that the OSSD outputs switch
off/on automatically according to an obstruction or clear view of the
(1) Figure indicates three cascade segments.
Transmitter Receiver
Connection to the
Machine Control
Host Segment
ATTENTION: Use of controls or adjustments or performance of
procedures other than specified, can result in hazardous radiation
exposure.
IMPORTANT The protective system must be tested for proper operation
after each change to the configuration.

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 5
GuardShield Type 4 and GuardShield Remote Teach
detection field. The GuardShield light curtain is configured at the
factory in Guard Only (automatic reset) mode.
Start Interlock
The start interlock stops the OSSD outputs from switching to ON state
after power-up of the system with the protective field unobstructed. A
manual reset of the system is required for the GuardShield light curtain
to enter the ON state.
The ON state is accomplished with one of two methods.
• Actuation of a momentary N.O. push button (see Figure 26 on
page 14)
• Interruption and restoration of the protective field within one
second.
After the first manual reset after power-up, the light curtain continues
operating in the Guard Only (automatic reset) mode.
Activation of this mode of operation and selection of the resetting
method is through DIP switch settings. Indication of this mode of
operation is through illumination of a yellow status indicator on the
GuardShield light curtain receiver (see Figure 42 on page 18).
Start interlock is not available on middle and end segments of a
cascading GuardShield light curtain system. However, it is possible to
configure this operating mode in the host segment and allow the whole
cascading system to operate in this mode. Start interlock is not available
in GuardShield light curtains with ArmorBlock Guard I/O module
connectivity.
Restart Interlock (Manual Reset)
The restart interlock mode of operation stops the OSSD outputs from
switching to ON after interruption and clearance of the protective field.
A manual reset of the GuardShield light curtain system is required.
Reset of the system is accomplished through a momentary N.O. push
button (see Figure 26 on page 14) or key switch. Configuration and
activation of this mode of operation is through DIP switch settings (see
Table 39 on page 17). The illumination of a yellow status indicator on
the GuardShield light curtain receiver indicates the restart interlock
mode.
Restart interlock is not available on middle and end segments of a
cascading GuardShield light curtain system. However, it is possible to
configure this operating mode in the host segment, which allows the
whole cascading system to operate in this mode (see Figure 42 on
page 18).
Restart interlock is not available in GuardShield light curtains with
ArmorBlock Guard I/O module connectivity.
Relay Monitoring (MPCE/EDM)
The relay monitor function is an input signal to the GuardShield light
curtain receiver. This function is used to monitor the state of the
protective machinery primary control contactors or other final
switching device (see Figure 25 on page 14). Detection of unsafe
conditions such as welded contacts, cause the GuardShield light curtain
to enter a lockout condition (OSSDs OFF). Activation of this mode of
operation is through DIP switch setting in the GuardShield light
curtain receiver (see Table 37 on page 17).
EDM is not available in the middle and end segments of a cascading
GuardShield light curtain system. However, it is possible to configure
this operating mode in the host segment, which allows the whole
cascading system to operate in this mode.
External Device Monitoring (EDM) is not available in GuardShield
light curtains with ArmorBlock Guard I/O module connectivity.
System Testing
The GuardShield light curtain performs a complete system self-test at
power-up. The output switch to the ON state if the system is properly
aligned and the protective field is unobstructed and the start/restart
interlock modes of operation are deactivated.
External Test (Machine Test Signal)
An external test signal to the GuardShield light curtain transmitter
triggers a test cycle of the system. Supplying or removing a signal (+24V
DC) via a N.C. or N.O. switch at the test input (see Figure 33 on
page 16) deactivates the transmitter during the test signal. Applying this
test signal simulates an interruption of the protective sensing field. The
polarity of the test input must be configured via a DIP switch that is
located in the GuardShield light curtain transmitter (see Table 38 on
page 17). The default setting is that the transmitter works in normal
operation if no signal is applied to the test input.
External test signal is not available in the middle and end segments of a
cascading GuardShield light curtain system. However, it is possible to
configure this feature in the host segment (see Figure 2 on page 4),
which allows the whole cascading system to operate in this mode.
Beam Coding
If several safety light curtains are operating close to one another, the
infrared light of the transmitter from one GuardShield light curtain
system can be seen by the receiver of another system. This situation
would cause a nuisance stop. To stop this optical interference, the
GuardShield light curtain is able to have the transmitter generate
different beam patterns, which are referred to as Beam Coding.
Selection and activation of beam coding is accomplished through DIP
switch settings in both the transmitter and receiver.
The following settings are available in the GuardShield safety light
curtain; noncoded and coded.
Blanking
The GuardShield safety light curtain can be configured with fixed
blanking of one or more adjacent beams, exclusive of the
synchronization beam. Floating blanking of one or two beams is also
capable of being configured. It is possible to activate both fixed and
floating blanking simultaneously.
IMPORTANT If a test cycle of a cascading system is required, it is necessary
to have all transmitters in a cascading system that is
configured in the same condition. For instance, all “active high”
or all “active low” condition.
IMPORTANT Beam coding improves resistance to optical interference.
Beam coding increases the system response time, which can
also increase the required safety distance. See Determine the
Safety Distance on page 8.

6Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Each cascading GuardShield light curtain segment pair functions as a
standalone safety light curtain with its OSSDs connected in series to the
host segment OSSDs. Therefore, it is necessary to configure fixed and/
or floating blanking in each individual pair segment. To configure, first
align all segment pairs and secure the brackets. It is then possible to open
a segment pair receiver door with the security tool that is provided. Set
the appropriate DIP switches and perform the teach function (see
Teach-in Procedure Function on page 18). The successful completion of
the teach function changes the operating mode of that segment pair
only.
Teach-in Fixed Blanking
The teach-in fixed blanking mode of operation is activated through DIP
switch settings that are located in the GuardShield light curtain receiver
(see Table 37 on page 17). The beams to be blanked are “taught” by
depressing the teach button that is located in the GuardShield light
curtain receiver endcap while the object is in the GuardShield light
curtain sensing field (see Figure 35 and Figure 36 on page 17).
The fixed blanking mode of operation is monitored. If any part or all of
the taught object is removed from the sensing field, the GuardShield
light curtain OSSD outputs go to the OFF state.
The GuardShield light curtain fixed blanking mode of operation is not
activated until the teach function (see Table 40 on page 18) is complete
and the access door is closed.
Figure 3 - Monitored Fixed Blanking of In-feed Rollers
• Beams are taught to ignore the fixed object in the sensing field
• The fixture or object must remain in the sensing field or
GuardShield light curtain enters a Fault state
Fixed Blanking enables the blanking out of fixed objects in the sensing
area of the light curtain. Table 7 on page 7 shows the reaction of the
monitored machine with Fixed Blanking deactivated and activated.
Floating Blanking
The floating blanking mode of operation is activated through DIP
switch settings that are located in the GuardShield light curtain receiver
(see Receiver—Factory Settings on page 17). Floating blanking allows
one or two beams that are located anywhere in the protective field to be
blanked out. For instance, blocked beams ignored and GuardShield
light curtain remains with outputs active.
Table 8 on page 7 depicts the state for the OSSD safety outputs for one-
and two- beam floating blanking for different situations.
Table 4 - Effective Resolution
Figure 5 - Floating Blanking
Floating Blanking allows an object to float in (move within, or in and
out of) the protective field without causing the light curtain outputs to
change to the OFF state.
IMPORTANT Balanced areas can require an additional risk analysis. If no
mechanical or other guarding is used to restrict access to the
hazard, the blanked area must be considered in the calculation
of the safety distance.
The configuration and activation of fixed blanking creates a
“hole” in the GuardShield light curtain protective field. If the
fixed object in the protective field does not fill the area
between the transmitter and receiver, it is necessary to
obstruct access to the hazard by additional means. You can
accomplish this obstruction by “hard guarding” the open area.
“Hard guards” refer to mechanical barriers.
Work Piece
Roller Work
Path
Fixed Blank
Beam
IMPORTANT IEC 62046 provides information on additional means that can
be required to stop an operator from reaching into the hazard
through the blanked areas of the detection zone.
IMPORTANT It is not possible to activate multiple beam floating blanking
on a 30 mm (1.18 in.) resolution GuardShield light curtain
system.
Actuation of the floating blanking mode of operation changes
the resolution of the GuardShield light curtain.
GuardShield Light Curtain
Resolution
Number of Beams
Floated Effective Resolution
14 mm (0.55 in.) 1 Beam 24 mm (0.94 in.)
2 Beam 34 mm (1.34 in.)
30 mm (1.18 in.) 1 Beam 50 mm (1.97 in.)
IMPORTANT After each configuration or reconfiguration of a GuardShield
light curtain, test the configuration of the GuardShield light
curtain using the appropriate test piece.

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 7
GuardShield Type 4 and GuardShield Remote Teach
Table 6 - Description of Symbols
Table 7 - Status of OSSD Safety Output for Different Situations in Case of Teach-in Fixed Blanking
Table 8 - Status of OSSD Safety Outputs for Different Uses in Different Cases of Floating Blanking
Symbol Description
Beam not interrupted
Beam interrupted
Beam is activated for Fixed Blanking and not interrupted
Beam is activated for Fixed Blanking and interrupted
Case 1 2 3 4 5 6 7 8
Infrared Beam No Blanking Fixed Teach-in Blanking
N
N+1
N+2
N+3
N+4
N+5
N+6
Status OSSDs OFF ON OFF OFF OFF OFF ON OFF
Case 1 2 3 4 5 6 7 8 9 10 11 12
Infrared Beam Reduced Resolution
Deactivated
Floating Blanking
1 Beam
Floating Blanking
2 Beams
N
N+1
N+2
N+3
N+4
N+5
N+6
Status OSSDs OFF ON ON OFF OFF ON ON ON ON OFF OFF OFF

8Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Response Time
The response time of the GuardShield safety light curtain depends on
the height of the protective field, the resolution, and the coding of the
system.
The response time of a cascading system is the response time of the
interrupted individual segment-pair response time.
Table 9 - Response Time for Finger Resolution (14 mm) [mm (in.)]
Table 10 - Response Time for Hand Resolution (30 mm) [mm (in.)]
Determine the Safety Distance
The light curtain must be mounted with proper safety distance
• From the point of danger
• From reflective surfaces
US Safety Distance Formula
This distance, referred to as the safety distance, must be properly
calculated before determining the safety light-curtain protective-height
and mounting the light curtains on the machine. Failure to calculate this
safety distance accurately results in operator injury.
In the United States, there are two formulas that are used to calculate
the safety distance. The first, the OSHA formula, is the minimum
requirement for the calculation of the safety distance. The second
formula, the one we recommend, is the ANSI formula, which
incorporates additional factors to be considered when calculating the
safety distance.
OSHA Safety Distance Calculation Formula
The OSHA safety distance formula as specified in CFR Subpart O
1910.217 is as follows:
Ds = 63 X T
DsSafety Distance
63 Is the OSHA recommended hand speed constant in inches
per second
T Is the total stop time of all devices in the safety circuit, which
is measured in seconds. This value must include all
components that are involved to stop the hazardous motion
of the machinery. For a mechanical power press, it is the stop
time that is measured at approximately the 90º position of the
crankshaft rotation.
Resolution Protective
Height
Number of
Beams
Response Time
w/o Coding
Response Time
w/Coding
14 (0.55) 160 (6.3) 16 20 ms 30 ms
14 (0.55) 320 (12.5) 32 20 ms 30 ms
14 (0.55) 480 (18.8) 48 20 ms 30 ms
14 (0.55) 640 (25.1) 64 20 ms 30 ms
14 (0.55) 800 (31.4) 80 20 ms 30 ms
14 (0.55) 960 (37.7) 96 20 ms 30 ms
14 (0.55) 1120 (44.0) 112 20 ms 30 ms
14 (0.55) 1280 (50.3) 128 20 ms 30 ms
14 (0.55) 1440 (56.6) 144 20 ms 30 ms
14 (0.55) 1600 (62.9) 160 25 ms 35 ms
14 (0.55) 1760 (69.2) 176 25 ms 35 ms
Resolution Protective
Height
Number of
Beams
Response Time
w/o Coding
Response Time
w/Coding
30 (1.18) 160 (6.3) 8 20 ms 30 ms
30 (1.18) 320 (12.5) 16 20 ms 30 ms
30 (1.18) 480 (18.8) 24 20 ms 30 ms
30 (1.18) 640 (25.1) 32 20 ms 30 ms
30 (1.18) 800 (31.4) 40 20 ms 30 ms
30 (1.18) 960 (37.7) 48 20 ms 30 ms
30 (1.18) 1120 (44.0) 56 20 ms 30 ms
30 (1.18) 1280 (50.3) 64 20 ms 30 ms
30 (1.18) 1440 (56.6) 72 20 ms 30 ms
30 (1.18) 1600 (62.9) 80 20 ms 30 ms
30 (1.18) 1760 (69.2) 88 20 ms 30 ms
IMPORTANT Determining Stop Time: The measurement of stopping time
(Ts) must include the stopping times of all devices in the stop
circuit. Not including all device and control system elements
when calculating Ts results in an inaccurate safety distance
calculation.
ATTENTION: The GuardShield Type 4 safety light curtains must be
mounted at a sufficient distance from the pinch point or point of
operation hazard. A sufficient distance helps confirm that the
machine stops before a finger, hand, arm, or body reaches the hazard.
IMPORTANT According to EN ISO 13855, regardless of the calculated safety
distance, never mount GuardShield Type 4 safety light curtains
closer than 100 mm (4in.) from the point of operation or pinch
point hazard.
IMPORTANT The T number must include the response times of all devices,
including:
• Response time of the safety light curtain
• Safety light curtain controller (if used)
• Control circuit of the machine, and
• Any other devices that react to stop the hazardous motion
of the machinery.

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 9
GuardShield Type 4 and GuardShield Remote Teach
The ANSI Safety Distance Formula
The ANSI safety distance formula, which is the Rockwell Automation®
recommended formula, is as follows:
DS = K x (TS + TC + Tr + Tspm) + Dpf
DSMinimum safety distance between the safe guarding device
and the nearest point of operation hazard, in inches.
K Hand-speed constant in inches per second. The ANSI
standard value is 1600.2 mm (63 in.) per second when the
operator begins reaching toward the point of operation
hazard from rest. NOTE: ANSI B11.19 2000 E8.3.2.3 and
Annex D states “One of the accepted values for K is the hand
speed constant (it is considered as the horizontal motion of
the hand and arm while seated). The common value of K is
1.6 m/s (63 in./s). Although other values (typically greater)
are also used. The hand speed constant does not include
other body movements, which can affect the actual approach
speed. Consideration of the above factors should be included
when determining the speed constant for a given application.
The employer should consider all factors, including the
physical ability of the operator, when determining the value
of K to be used.”
TSStop time of the machine tool that is measured at the final
control element. Measurement starts at maximum machine
velocity.
TCResponse time of the control system
TrResponse time of the presence sensing device (safety light
curtain) and its interface, if any. The device manufacturer
states the value or you measure it.
Tspm Additional time is allowed for the stop performance monitor
to compensate for variations in normal stopping time Ts.
Check ANSI B11.19 Annex D for details.
Dpf Depth penetration factor. It is an added distance to allow for
how far into the protective field an object, such as a finger or
hand, can travel before being detected. Dpf is related to the
object sensitivity of the safety light curtain. Object sensitivity
(resolution) is the smallest diameter object, which is detected
anywhere in the sensing field.
Example (for US):
In a perpendicular safety-light curtain application with object sensitivity
(effective resolution) less than 64 mm (2.5 in.), the Dpf can be
approximated based on the following formula:
Dpf (inches) = 3.4 × (Object Sensitivity – 0.276),
But not less than 0.
For GuardShield Type 4 light curtain:
Object sensitivity = 30 mm (1.18 in.)
Dpf = 3.4 x (1.18 - 0.276 in.) = 3.08 in.
TS = 241 ms = 0.241 s
TC = 10 ms = 0.01 s
Tr = 20 ms = 0.02 s
Tspm = 20% of Ts (calculated by the machine manufacturer) = 49 ms =
0.049 s
K = 63in./s (determined by the machine manufacturer)
DS = 63 x (0.241 + 0.01 + 0.02 + 0.049) + 3.08 in.
= 63 x 0.32 + 3.08 in.
= 20.16 + 3.08 in.
= 23.24 in. (600 mm)
European Safety Distance Formula
A safety distance must be maintained between the light curtain and the
point of danger. This safety distance confirms that the point of danger
can only be reached after the dangerous state of the machine has been
removed.
The safety distance as defined in EN ISO 13855 and EN ISO 13857
depends on:
• Stopping/run-down time of the machine. (The stopping/run-down
time is shown in the machine documentation or must be determined
by taking a measurement.)
• Response time of the protective device, for example, GuardShield
Type 4 light curtain (see Response Time on page 8).
• Response time of the safety circuit:
• Reach or approach speed.
• Resolution of the light curtain.
Figure 11 - Safety Distance from the Point of Danger
WARNING: Not including the response time of a device or devices
in the stop time calculation results in insufficient safety distance
for the application, which results in operator injury.
IMPORTANT A stop time measuring device measures Ts + Tc + Tr + Tspm. IMPORTANT An operator is not able to stand between the protective field
and the point of operation. EN ISO 13855 requires a maximum
distance “X” (see Figure 11 on page 9) of ≤ 70 mm (2.76 in.)
at an installation height of 300 mm (11.9 in.). Check EN ISO
13855 for other installation heights.
Safety Distance S (Ds)
Protective Field Height
X
Point of
Danger

10 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
How to Calculate the Safety Distance S
According to EN ISO 13855 and EN ISO 13857:
First, calculate S using the following formula:
S = 2000 × T + 8 × (d – 14) [mm]
Where …
T = Stopping/run-down time of the machine
+ response time of the protective device [s]
d = Resolution of the light curtain [mm]
S = Safety distance [mm]
The reach/approach speed is already included in the formula.
→ If the result S is  500 mm (19.6 in.), then use the determined value
as the safety distance.
→ If the result S is > 500 mm (19.6 in.), then recalculate S as follows:
S = 1600 × T + 8 × (d – 14) [mm]
→ If the new value S is > 500 mm (19.6 in.), then use the newly
determined value as the minimum safety distance.
→ If the new value S is  500 mm (19.6 in.), then use 500 mm (19.6in.)
as the safety distance.
Example (for Europe):
Stopping/run-down time of the machine = 290 ms
Response time safety circuit = 10 ms
Response time light curtain = 20 ms
Resolution of the light curtain = 30 mm (1.18 in.)
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 2000 × 0.32 + 8 × (30 – 14) = 768 mm (30.24 in.)
S > 500 mm (19.7 in.), therefore:
S = 1600 × 0.32 + 8 × (30 – 14) = 640 mm (25.1 in.)
Minimum Distance from Reflecting Surfaces
The infrared light from the sender is reflected off shiny surfaces and
received by the system receiver. If this condition occurs, it can result in
an object not being detected when it enters the GuardShield Type 4
light curtain sensing field.
All reflecting surfaces and objects (for example, material bins) must
therefore be at the minimum distance (a) from the protective field of the
system. The minimum distance (a) depends on the distance (D)
between sender and receiver.
Figure 12 - Minimum Distance from Reflecting Surfaces
How to Determine the Minimum Distance from the Reflecting
Surfaces
→ Determine the distance (D) [m] sender-receiver
→ Read the minimum distance (a) [mm] from the graph
Figure 13 - Graph, Minimum Distance from Reflective Surfaces
The effective aperture angle for the GuardShield Type 4 light curtain
system is within ±2.5° at a mounting distance of > 3.0 m (9.8 ft).
Calculate the minimum distance to reflective surfaces depending on the
distance between the transmitter and the receiver. Use an aperture angle
of ±2.5°, or take the appropriate value from Table 14.
Table 14 - Minimum Safety Distance to Reflective Surfaces
Installation and Mounting
This section describes the preparation, selection, and installation of the
GuardShield safety light curtain.
The standard GuardShield light curtain has an amber status indicator in
the receiver (see Figure 42 on page 18), which is used as an alignment
aid. This status indicator begins to flash when the infrared light from
the transmitter is seen by the receiver. This status indicator turns off
when optimal alignment is attained.
Alignment Procedure: Standard GuardShield light curtain
Mount and connect both transmitter and receiver. The transmitter and
receiver must be:
• Parallel to each other
• Positioned at the same height
• Connected to the same end (see Figure 15 on page 11)
a
Distance D (meters)
Distance between Transmitter and Receiver
(Range L) [m (ft)]
Minimum Distance (a)
[mm (in.)]
0.2…3.0 (0.65…9.8) 135 (5.31)
4.0 (13.1) 175 (6.88)
5.0 (16.4) 220 (8.66)
6.0 (19.6) 265 (10.43)
7.0 (22.9) 310 (12.2)
10.0 (32.8) 440 (17.32)
16.0 (52.4) 700 (27.55)
IMPORTANT Formula: a = tan 2.5° x D [mm] = 0.0437 x D [mm]
a = minimum distance to reflective surfaces
D = distance between transmitter and receiver
1000
100
200
300
400
500
600
700
800
900
D [m]
20151043
a [mm]

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 11
GuardShield Type 4 and GuardShield Remote Teach
Figure 15 - Inverse Mounting
1. Turn on power to GuardShield light curtain system.
2. Rotate the transmitter while watching the amber indicator on
the receiver (see Figure 42 on page 18) to find the points where
the indicator changes from ON (amber) to OFF.
3. Determine the maximum left- and right-turn angles and
position unit in center.
4. Tighten all hardware to fix the alignment.
5. Then do the same alignment procedure with the receiver.
6. Cycle power to confirm that the system powers up and goes to
the ON state (alignment indicator is OFF).
The GuardShield light curtain is also offered with an integrated laser
alignment system. This alignment system has a constant low-powered
Class 1, eye safe laser located in the top of the transmitter and in the
bottom of the receiver. Each laser emits a low level of visible light.
Simply block this light below the finger symbol causes the light to be
reflected back to a photo sensor, which changes the condition of the
laser light to high powered. If this light is at a low level, interruption
causes the laser to emit a highly visible level of light. Interruption of the
visible light in the same location causes the laser to switch to a low level
of emission. The emission of visible light also changes to a low level after
five minutes of activation.
Across from each laser, is a target that is used to help with the alignment
of the GuardShield light curtain pair. Positioning the visible light in the
center of the top and bottom targets positions the GuardShield light
curtain pair for optimal alignment.
An external laser (440L-ALAT) and mounting bracket
(450LALAT-C) is offered as an accessory for aligning the GuardShield
light curtain without Integrated Laser Alignment (see Laser Alignment
Tool on page 35).
Alignment Procedure for GuardShield Light Curtain with
Integrated Laser Alignment
1. Properly locate the GuardShield light curtain pair from the
point of operation hazard after performing the safety distance
calculation.
2. Use the GuardShield light curtain mounting brackets to mount
the transmitter and receiver so that they are facing one another
and are positioned in the same direction (see Figure 15 on
page 11). A reference would be that the indicator light-emitting
diodes are opposite one another.
Turn on each laser by placing a finger or hand in front of each
laser.
For optimal alignment, adjust the transmitter and receiver in
such a way that both visible laser beams meets the laser targets
opposite each laser. A small deviation around the target is
allowable.
The GuardShield safety light curtain is suitable for most operating
environments (IP65 environmental rating). Proper safety distance and
adequate protective height must be observed.
Determine if the machinery, on which the GuardShield light curtain is
to be mounted, meets the requirements as specified in the beginning of
this manual. For instance, the machinery must be able to stop anywhere
in its stroke or cycle, consistently and repeatedly.
Figure 16 - Correct Installation
IMPORTANT The installation of the GuardShield safety light curtain must
be such that access to the hazard is only possible through the
sensing field of the GuardShield light curtain. Auxiliary safe
guarding can be required with the GuardShield light curtain
to meet this requirement.
Operators cannot reach hazardous
machine parts without passing through
the protective field.
Operators must not step between
protective field and hazardous machine
parts (by-pass prevention).

12 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Figure 17 - Incorrect Installation
The GuardShield light curtain must be mounted at the proper distance
from the point of operation hazard. This distance is referred to as the
Safety Distance (see Determine the Safety Distance on page 8).
Figure 18 - Determine Machine Stopping Time and Safety Distance
Configuration of Operating Modes in Cascading Systems
All operating modes of a standard GuardShield light curtain can be
configured in the host or first segment in a cascading GuardShield light
curtain system. Middle and end segments can only have the following
operating modes/features configured.
• Beam coding
• Floating blanking
• Fixed blanking
All other possible operating modes of a standard GuardShield light
curtain, if configured in a middle or end segment, cause lockout or off
conditions. This condition requires the cycling of power and a
reconfiguration of the segment.
Two Segment Cascading GuardShield Light Curtain Systems
If the GuardShield light curtain pair is vertically mounted so that a
person can stand between the vertical pair and the machine hazard, a
means of detection of that person is required.
There are a few methods of detecting the presence of a person who
could be standing in front of the machine hazard but inside of the light
curtain. Installation of a safety mat or safety laser scanner are possible
solutions. However they are costly solutions as they are separate safety
systems that are integrated into the safety circuit. The most cost-
effective solution is to interconnect an additional light curtain in series
to the vertical pair. Select a Host or cascade pair of GuardShield safety
light curtains with a protective height and resolution that is based on
the results of a risk assessment. Then select the horizontal protective
height of the pair of light curtains. This pair provides detection from the
vertical pair to the front of the machine hazard. Typically, this pair of
light curtains can have a 30 mm (1.18 in.) resolution as their purpose is
to detect the presence of a person and not fingers.
The next step is to select the interconnected patchcords for the
transmitter and receiver. These patchcords are offered in various
lengths. Finally it is necessary to determine if the last segment of the
cascading system is a standard or cascading GuardShield light curtain
pair. Cascade segments that are not connected to another pair of
GuardShield light curtains must have a termination plug that is attached
to the receiver segment.
Figure 19 - Example for a Setup with Two Cascaded Segments
(L-shape Setup)
L-shaped two segment GuardShield light curtain cascade
systems offer protection when it is possible to stand between the
vertical light curtain and the machine hazard
IMPORTANT You are not able to stand between the protective field and the
point of operation. EN ISO 13855 requires a maximum
distance “X” (see Figure 18) of ≤ 70 mm (2.76 in.) at an
installation height of 300 mm (11.9 in.). Check ENISO13855
for other installation heights.
Operators can reach hazardous
machine parts without passing through
the protective field.
Operators can step between protective
field and hazardous machine parts.
Middle of Depth of Protective Field
Safety Distance
Point of Operation
Top of tool
Bottom of tool
X
Protective Field Marking
Machine stop time

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 13
GuardShield Type 4 and GuardShield Remote Teach
Three Segment GuardShield Light Curtain Cascading Systems
When the use of corner mirrors is not practical or possible, three-sided
guarding of a machine hazard is possible using cascade GuardShield
light curtains.
Figure 20 - Top and Bottom Mounting of Three GuardShield light
curtain Segments
(U-shape Setup)
Top and bottom mounting of three GuardShield light curtain segments
is possible. This configuration provides three-sided machine guarding
without the use of corner mirrors.
Mounting and Alignment of Cascading GuardShield Light Curtain
Multiple GuardShield Light Curtains
When two or more GuardShield light curtains are mounted close to one
another, it is possible for the receiver of one pair to receive infrared light
from the transmitter of another pair. The GuardShield light curtain
feature of beam coding overcomes this optical interference. Beam
coding changes the pulse pattern of infrared light that a GuardShield
light curtain transmitter emits.
Figure 21 - Multiple GuardShield Light Curtain Alignment Options
Mounting Brackets
By default, the GuardShield light curtain is mounted using right angle
brackets (Figure 22) that are attached to the endcaps of both transmitter
and receiver. It can be necessary to use additional brackets (see
Figure 23) to mount the GuardShield light curtain at a proper safety
distance from the machinery hazard. For applications with shock and/or
vibrations, also see Table 66.
Figure 22 - Mounting Brackets (AF-6101)
IMPORTANT It is necessary to align cascade segments in a particular order.
Begin by aligning the last segment in the system. Once the
last receiver status indicator is green; secure mounting
brackets of that pair. Next align the middle segment pair.
When the middle-segment receiver status indicator is green,
secure those brackets. Finally align the host segment. When
that receiver status indicator is green, secure those brackets.
Test system by interrupting sensing field of last segment and
verify that all receiver OSSD status indicators are red.
Next interrupt the sensing field of the middle segment pair (if
any) and confirm that the middle segment and host segment
receiver OSSD status indicators are red. The last segment-pair
receiver status indicator remains green. Finally, interrupt the
sensing field of the host segment receiver and confirm that
the receiver OSSD status indicators are red (middle and end
segment pairs indicate green).
Horizontally adjacent: Transmitters emit in
opposite direction. Each receiver receives
only the beams of the appropriate
transmitter.
Transmitters emit in same direction:
Coding necessary
Vertically adjacent: Positioning of the light
curtain: Transmitters emit in opposite
direction.
52 (2.05)
42
(1.65)
3
(0.12)
20 (0.79)
6.5 (0.26)
18.9
(0.74)
14.5
(0.57)
40 (1.57)
33.34
(1.31) Ø
BC
31.75
(1.25)
22.15
(0.87) Ø

14 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Figure 23 - Optional Middle Mounting Bracket (440L-AF6108)
Middle mounting brackets can be used in vibration applications for
protective heights of 1120 mm (44.09 in.) and larger.
Figure 24 - GuardShield Light Curtain Remote Teach Receiver Bracket
See GuardShield Light Curtain Remote Teach on page 29.
Electrical Installation Power Supply
The external voltage supply (+24V DC) must meet the requirements of
IEC 61496-1. In addition, the following requirements have to be
fulfilled:
• The power supply bridges a short-term power failure of 20 ms.
• The power supply has double insulation between the primary
and the secondary side.
• Helps protect the power supply against overload.
• The power supply corresponds to the guidelines of the EWG
(industrial environment).
• The power supply corresponds to the Low Voltage Directives.
• The grounded conductor of the power supply device must be
connected to a grounded conductor PE.
• The maximum deviation of the voltage levels is 24V DC ± 20%.
EDM Connection
See Relay Monitoring (MPCE/EDM) on page 5.
Figure 25 - Connecting the Contact Elements to the EDM
Figure 26 - Connecting the Reset Button/Restart Button
See Start Interlock and Restart Interlock (Manual Reset) on page 5.
Connections [mm (in.)]
Figure 27 - Cables/Connectors
The GuardShield light curtain transmitter connector is a four-pin DC
micro connector that is offered in cable lengths of 2…30 m (6.56…98.4
ft). The GuardShield light curtain receiver connector is an 8-pin DC
micro connector that is offered in cable lengths of 2…30 m
(6.56…98.4ft).
49.2 (1.93)
40.2
(1.58)
62
(2.44)
24
(0.94)
30 (1.18)
20 (0.78)
IMPORTANT Not available for GuardShield light curtain with ArmorBlock
Guard I/O module connectivity.
IMPORTANT Not available for GuardShield light curtain with ArmorBlock
Guard I/O module connectivity.
24V Pin 4 5
6
K1
K2
k2 k1
Contactor Contacts
Contactor
Coils
Reset/Restart Button
Pin 8
24V
42 (1.7)
15 (0.57)

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 15
GuardShield Type 4 and GuardShield Remote Teach
Table 28 - GuardShield Light Curtain Standard and GuardShield Light
Curtain with ArmorBlock Guard I/O Module Connectivity
The transmitter is not expected to be connected to the ArmorBlock
Guard I/O module.
Table 29 - Standard GuardShield Light Curtain Receiver Connector
Table 30 - GuardShield Light Curtain Receiver Connector for
ArmorBlock Guard I/O Module Connectivity
Table 31 - Interconnect Patchcords for Cascading GuardShield Light
Curtain
Figure 32 - Example of Patchcord for Interconnecting Cascading
GuardShield Light Curtain
Transmitter Connection
Face View of Female DC Micro Color Pin No. Signal
Transmitter
Brown 1 +24V DC
White 2 No Connection
Blue 3 0V DC
Black 4 Machine Test Signal
Receiver Connection
Face View of Female DC Micro Color Pin No. Signal
Receiver
White 1 Auxiliary Output
Brown 2 +24V DC
Green 3 Ground
Yellow 4 EDM
Gray 5 OSSD 1
Pink 6 OSSD 2
Blue 7 0V DC
Red 8 Start/Restart
Top View Color Pin No. Signal
Receiver
Brown 1 +24V
White 2 OSSD 2
Blue 3 0V
Black 4 OSSD 1
Gray 5 NC
Cat. No. Description
Transmitter Patchcord
889D-F4HLDM-0M3 4-pin M12 patchcord, 12 inches
889D-F4HLDM-1 4-pin M12 patchcord, 1 meter
889D-F4HLDM-2 4-pin M12 patchcord, 2 meters
Receiver Patchcords
889D-F8ABDM-0M3 8-pin M12 patchcord, 12 inches
889D-F8ABDM-1 8-pin M12 patchcord, 1 meter
889D-F8ABDM-2 8-pin M12 patchcord, 2 meters
Shorting Plug (Required for cascading GuardShield light curtain if last pair in cascade system or
standalone pair.)
Receiver
898D-81CU-DM Termination plug 8-pin M12 quick-disconnect
14
32
2
15
8
76
4
3
1
3
2
5
4

16 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Figure 33 - Typical Wiring Diagram—Direct to Contactors with EDM
Nonsafety auxiliary output (white) can be connected to a lamp, motor, or status to a PLC.
2 S1 test is only connected based on risk assessment.
Figure 34 - Typical Wiring Diagram—To MSR127 Safety Relay Module
IMPORTANT If MPCE/EDM is activated in the GuardShield light curtain, the
application requires a safety contactor. If MPCE/EDM is not
used, K1 & K2 can be standard contactors.
M
+ 24V DC
24V Ground
SENDER
OSSD 1
OSSD 2
RECEIVER
K1
Bulletin 100S
Safety Contactors
or 700S Safety Relays
K2
L1 L3L2
Gray
Pink
Green
Blue
Blue
Yellow
Brown
Brown
S2
Start/Restart
Red
MPCE/EDM
S1
Test
Black
Machine
Test
Signal
White
Auxiliary
Signal
+24V
3
1
A S12S52
K4
Transmitter 72 Receiver
L1
K5
OSSD2OSSD1
65
13 3323 41
A2 S22S21 14 3424 42S34
L2 L3
K4
K5
K4 K5
DC Common
Reset
MSR127RP
M

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 17
GuardShield Type 4 and GuardShield Remote Teach
System Configuration
Figure 35 - DIP Switch Selection Settings—Transmitter
Figure 36 - DIP Switch Selection Settings—Receiver
After you mount, electrically connect, and align the GuardShield safety
light curtain, it is now possible to configure your system.
To begin system configuration, use the security tool that is provided to
loosen the screw in the configuration door.
Identify and set the appropriate DIP switches for the configuration
desired.
DIP switch identification and function are explained in
Table 37…Table 39 on page 17.
Follow the Teach-in Procedure Function on page 18 to reconfigure the
GuardShield light curtain.
When delivered from the factory, the following settings are configured.
Table 37 - Receiver—Factory Settings
Table 38 - Transmitter—Factory Settings
Table 39 - Settings for Mode of Operation—Receiver
Cascading Segment DIP Switch Settings
There are a few operating modes that cannot be configured in the
middle and end segments of a cascading GuardShield light curtain
IMPORTANT The configuration door screw is a captive screw.
The transmitter can only be configured for beam coding and
Machine Test Signal. If neither of these configurations are
required, then it is only necessary to configure the
GuardShield light curtain receiver.
IMPORTANT After each reconfiguration of the GuardShield light curtain,
test the system for proper configuration and operation before
placing the guarded machine in operation.
Door Status
Switch
Teach
Button
Door Status
Switch
Teach
Button
Switch Switch Function Default
Setting Description
1 Mode Activation—Combination
activates
one of the following modes:
Guard only, start interlock, restart
interlock
ON
Guard Only (see Table 39 on
page 17)
2 ON
3 MPCE/EDM Monitoring disable ON EDM Disabled
4 Teach-in Fixed Blanking Activate OFF Teach-in Fixed Blanking Disabled
5Floating Blanking Activate—
Single Beam OFF Switches 5 and 6 cannot be
activated “On” simultaneously.
6Floating Blanking Activate—Two
Beams OFF
7 Set Beam Coding OFF
Beam Coding Disabled (this
setting should match the setting
of switch one in Table 38 on
page 17.
8 Not used OFF —
Switch Switch Function Default
Setting Description
1 Set Beam Coding OFF
Disabled (this setting should match the
setting of switch seven in Table 37 on
page 17
2 Machine Test Signal OFF
OFF: TX stops transmitting when signal
is High — Do not connect or connect
normally open
ON: Signal Low active—Connect N/C
Switch 1 Switch 2 Condition Operation
ON ON Guard Only
(automatic reset)
ON/OFF
Operation
OFF ON
Start Interlock
(Push Button
Reset)
Only Interlock at startup—Reset by actuation of
the push button switch. After the first manual
reset, Guard Only (automatic reset) is active.
OFF OFF
Restart
Interlock (manual
reset)
Interlock at interruption of sensing area —
Reset by manual activation of the push button
switch.
ON OFF Start
Interlock
Interlock at startup—Reset by Interruption/
restoration of sensing area for <1 sec.
ATTENTION: Every modification at the DIP switches must be
stored in the memory of the device through the Teach function
(see Teach-in Procedure Function on page 18).
IMPORTANT GuardShield light curtains with ArmorBlock Guard I/O
module connectivity have receiver DIP switches 1, 2, and 3
disabled. The configurable features that are allowed for this
GuardShield light curtain are fixed and floating blanking and
beam coding.

18 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
system. The following Operating modes if configured cause the light
curtain to fault;
• EDM
• Start and restart interlock
Power must be cycled and the segment pair must be retaught to
deactivate the mode.
Table 40 - Teach-in Procedure Function
The doors on the transmitter and receiver must be closed for the
GuardShield light curtain to operate.
Troubleshooting Guide
The light curtain conducts an internal self-test after startup. If an error
occurs, an appropriate signal combination is sent through the status
indicators to the transmitter and receiver.
Table 41 - Error Descriptions
Figure 42 - Status Indicator at Transmitter (Tx) and Receiver (Rx)
Table 43 - System Status Indicators
IMPORTANT Configuration of the EDM in a middle or end segment causes
an EDM fault in that configured segment even if EDM is also
configured and functions in the Host segment. Interruption of
the middle or end segment, which has EDM also configured,
causes the middle or end segment to go to a lock out
condition. That condition cannot be reset without cycling
power and reconfiguring the middle or end segment without
the non-allowed configuration.
Configure the start or restart interlock in the middle or end
segment causes a fault in the middle or end segment, which
has that Operating mode configured. The status indicator
shows a “Waiting for reset” fault, which cannot be reset even
if the Host segment is also configured for the start or restart
interlock. Due to the lack of an internal reset line in the
middle or end segment, it is not possible to reset the middle
or end segment before resetting the Host segment.
Step 1
Open the cover of the end cap
Receiver: red status indicator flashes (OSSD OFF)
Transmitter: orange status indicator flashes (POWER ON). See Figure 42 on
page 18.
Step 2 Select the desired DIP switch setting.
Step 3
Press and hold the Teach button. The yellow status indicator starts flashing at
10 Hz (10x per second):
RX: Blanking indicator
TX: Emitting indicator
Step 4
After five seconds, the status indicator stops flashing. After the indicator stops
flashing, release the teach button within two seconds. After three flashes of the
yellow status indicator, the function is activated.
Step 5 Close and secure the cover. The indicator stops flashing.
IMPORTANT If the GuardShield light curtain teach procedure is not
properly completed, the unit remains in the previous
operating mode.
Once the teach function is completed and the door that is
secured, verify that the operating mode has changed to the
intended mode.
Condition No. Error Description Action
8 Internal fault, receiver
• Check configuration of transmitter
and receiver
• Replace receiver
9 Internal fault, transmitter
• Check configuration of transmitter
and receiver
• Check protective field transmitter/
receiver
• Check connections transmitter/
receiver
• Exchange transmitter
10 External fault
• Check connections of OSSD outputs
for short circuit against +24V DC and
GND (cable, connected devices)
• Exchange receiver
11
External fault (MPCE/EDM error)
The function Relay monitoring
is activated and after clearing
the OSSD the input Relay
monitoring does not recognize a
change of state.
• Check connection Relay monitoring
• Check connected relay for closed
contact (if OSSD ON—input Relay
monitoring must have GND level, if
OSSD OFF—input Relay monitoring
must have +24V)
• Switch on only after POWER OFF/ON
12 Configuration mode (Receiver) • Cover for DIP switch setting at the
receiver is open
13 Configuration mode
(Transmitter)
• Cover for DIP switch setting at
transmitter is open
Receiver Transmitter
OSSDs OFF Blanking Emitting
OSSDs ON
Interlock
Alignment POWER ON
Condition No.
Receiver Status Indicators Transmitter Status Indicators
OSSDs
OFF
Red
OSSDs
ON
Green
Blanking
Yellow
Alignment
Amber
Interlock
Yellow
Power
On
Amber
Emitting
Yellow
1 OFF ON OFF OFF OFF ON ON
2 ON OFF OFF OFF OFF ON ON

Rockwell Automation Publication 440L-IN012A-EN-P - November 2017 19
GuardShield Type 4 and GuardShield Remote Teach
Condition Nos. 8...13 (gray shading) are fault conditions
Flash rate is approximately 2 Hz (2 times per second)
Checklist
Before the initiation of the GuardShield light curtain the responsible person works through the following checklist.
Cable check before initiation:
3 ON OFF OFF ON OFF ON ON
4 ON OFF OFF OFF ON ON ON
5 OFF ON ON OFF OFF ON ON
6 OFF ON FLASH OFF OFF ON ON
7 ON OFF OFF OFF OFF ON OFF
8 FLASH OFF OFF OFF OFF ON ON
9 ON OFF OFF OFF OFF FLASH ON
10 FLASH OFF OFF ON OFF ON ON
11 FLASH OFF OFF OFF ON ON ON
12 FLASH OFF DATA TRANS OFF OFF ON ON
13 ON OFF OFF OFF OFF FLASH DATA TRANS
Condition No. Description
1 Guard only (automatic reset) mode, light curtain unobstructed (aligned, not in interlock)
2 Guard only (automatic reset) mode, light curtain interrupted (aligned, not in interlock)
3 Guard only (automatic reset) mode, misaligned (not in interlock)
4 Guard only (automatic reset) mode, in start or restart interlock (aligned)
5 Fixed blanking mode (aligned, not in interlock)
6 Floating or Floating/Fixed Blanking mode (aligned, not in interlock)
7 Transmitter test input active (pin 4)
8 Internal fault, receiver
9 Internal fault, transmitter
10 External fault (OSSD short to ground, +V, or cross connection)
11 External fault (MPCE/EDM error)
12 Configuration mode (receiver access door open)
13 Configuration mode (transmitter access door open)
IMPORTANT For fault conditions 8...13. See Troubleshooting Guide on page 18.
ATTENTION: Confirm that all power to the machine, and safety
system is disconnected during electrical installation.
IMPORTANT Before power-up of the GuardShield light curtain system, the
responsible person reviews the following Checklist.
1. The power supply is a 24V DC device, which must comply to all applicable standards of the
Machinery Directive 2006/42/EC, and the product standard (IEC 61496).
2. Proper polarity of the power supply at the GuardShield light curtain.
3. The transmitter connection cable is properly connected to the transmitter, the receiver
connection cable is properly connected to the receiver.
4. The double insulation between the light curtain output and an external potential is
confirmed.

20 Rockwell Automation Publication 440L-IN012A-EN-P - November 2017
GuardShield Type 4 and GuardShield Remote Teach
Switch on the GuardShield light curtain and check its function by
observing the following:
Safety Instructions—Maintenance
For safety reasons, all inspection results are recorded.
Only persons, who clearly understand the functioning of the
GuardShield light curtain and of the machine, can conduct an
inspection.
If the installer, planning engineer, and operator are different people,
make sure that they have sufficient information available to conduct the
inspection.
Daily Inspection
Operate the machine and check, if the hazardous movement stops under
the following circumstances.
Figure 44 - Proper Testing of Protective Field Using Test Rod
Six-month Inspection
Check the following items every six months or whenever a machine
setting was changed.
Cleaning
If the optic front cover of the GuardShield light curtain is dirty, the
outputs of the GuardShield light curtain turn off. Take a clean, soft
cloth and rub without pressure. Do not apply aggressive, abrasive, or
gritty cleaning agents, which can attack the surface.
Date Code
Figure 45 - Product Label for Units Produced before 2017
Items that are marked in Figure 45:
• Serial number
• Production data code
Use the codes in Table 46 for older GuardShield light curtain units that
don’t have the date printed on the label.
5. The OSSD outputs are not connected to +24V DC.
6. The connected switching elements (load) are not connected to 24V DC.
7. No connection to a conventional power supply.
8. If two or more GuardShield light curtain are to be used, make sure that each system is
properly installed, to avoid optical interference.
9. Two seconds after switching on, the system starts to work properly, if the protective field is
free of obstructions.
ATTENTION: Never operate the GuardShield light curtain before
conducting the following inspection. Improper inspection can lead
to serious or even deadly injury.
1. Approach to hazardous machine parts must only be possible through passage through the
protective field of GuardShield light curtain.
2. Operators cannot step through the sensing area while working on dangerous machine
parts.
3. The safety distance of the application is bigger than the calculated value.
4. The optic front cover is not scratched or dirty.
5. The protective field is interrupted.
6.
The hazardous movement stops immediately if you interrupt the protective field by placing
the test rod directly:
• In front of the transmitter
• In front of the receiver
• In between the transmitter and receiver
7. No hazardous machine movement while the test rod is anywhere within the protective
field.
8. The power supply of the GuardShield light curtain is turned off.
9. If the blanking function is activated, check all sections of the protective field with the
appropriate test rod (see Figure 44 on page 20).
IMPORTANT If any of the conditions previously described do not result in
the hazardous motion of the machine stopping, do not allow
the protected machine to be placed in operation.
1. Machine stops or does not obstruct any safety function.
2. The latest machine or connection modifications have no effect on the control system.
3. The outputs of the GuardShield light curtain are properly connected to the machine.
4. The total response time of the machine is shorter than the calculated value.
5. Cables and plugs of the GuardShield light curtain are in flawless condition.
6. Mounting brackets, caps and cables are tightly secured.
Transmitter
Receiver
Rockwell Automation Inc., 1201 South 2nd Street Milwaukee, W I 53204, USA
GuardShield
TM
SER
Power Consumption
Supply Voltage
Safety Parameters
Electro-Sensive
Protecve Equip.
19KP
EN62061/ IEC61508
Operating Instructions
Degree of Protection
Q
Range
Protective Height
Response Time with Coding
Response Time w/out Coding
PLANT 1150
DATE 1705
PRODUCT OF MEXICO
SN
REV
CAT
MAT NO
Ambient Temp.
A
B
C D
1234567890
IEC61489/ EN ISO 13849
N_GRAPHIC1
N_CE
N_CTICK
N_WEEE
N_GRAPHIC_ROHS
N_UL
F
G
H
I
J
K
L
M
N
E
O
P