Rockwell Automation Allen-Bradley 440R-GL2S2T User manual

User Manual Original Instructions
Guard Locking with Time-
Delay (GLT) Safety Relay
Catalog Number 440R-GL2S2T

2Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Guard Locking with Time-Delay (GLT) Safety Relay User Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
These labels may also be on or inside the equipment to provide specific precautions.
The following icon may appear in the text of this document.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous
voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may
reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to
potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL
Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).
Identifies information that is useful and can help to make a process easier to do or easier to understand.

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 3
Table of Contents
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 1
Overview Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function 1 - Guard Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function 2 - E-stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 2
Installation Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DIN Rail Mounting and Dismounting . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Removable Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Enclosure Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Prevent Excessive Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 3
Power, Ground, and Wire Wiring Requirements and Recommendations . . . . . . . . . . . . . . . . . . . . . 13
Wire Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Ground the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Connect the Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety Devices with Mechanical Contacts . . . . . . . . . . . . . . . . . . . . . . 15
Safety Devices with OSSD Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Unlock Request Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Lock and Reset Request Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Lock and Unlock Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Retriggerable Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Use Surge Suppressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Single Wire Safety (SWS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SWS Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SWS Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 4
Configuration Logic Switch Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Range Switch Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Time Switch Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Configuration Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Five Step Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Configuration Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 5
Diagnostics and
Troubleshooting
Status Indicators During Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Status Indicators During Normal Operation. . . . . . . . . . . . . . . . . . . . . . . 27
Status Indicators During Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Additional Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Chapter 6
Pulse Testing Functions Pulse Testing for Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Pulse Testing of Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Appendix A
Specifications General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Inputs IN1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Lock Unlock Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Retrigger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Lock Unlock Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Auxiliary Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Single Wire Safety Input Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Single Wire Safety Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Recovery Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Response Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Appendix B
Regulatory Approvals Agency Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
CE Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
UKCA Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SIL Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Performance Level/Category. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 5
Preface
About This Publication This manual is a reference guide for the Guardmaster® Guard Locking with
Time-Delay (GLT) Safety Relay and accessories. This manual describes the
procedures to install, wire, and troubleshoot your safety relay, and gives an
overview of the GLT safety relay performance.
Who Should Use This
Manual
Use this manual if you design, install, program, or troubleshoot control
systems that use the GLT safety relay.
You must have a basic understanding of electrical circuitry and familiarity
with safety-related control systems. If you do not, obtain the proper training
before using this product.
Definitions Publication AG-7.1 contains a glossary of terms and abbreviations that are used
by Rockwell Automation to describe industrial automation systems. The
following specific terms and abbreviations are used in this manual.
Summary of Changes This publication contains the following new or updated information. This list
includes substantive updates only and is not intended to reflect all changes.
Additional Resources These documents contain additional information concerning related products
from Rockwell Automation.
Term Definition
N.C. Normally Closed – An electrical contact whose normal state (no pressure or electrical
potential applied) is in the closed position.
N.O. Normally Open – An electrical contact whose normal state (no pressure or electrical
potential applied) is in the open position.
Reaction Time Describes the time between the true states of one input to the on state of the output.
Recovery Time Describes the time that is required for the input to be in the LO state before returning
to the HI state.
Response Time Describes the time between the trigger of one input to the off state of the output.
OSSD Output Signal Switching Device – A pair of solid-state signals that pull to the DC source supply. The signals are tested for short circuits to the DC power supply, short circuits
to the DC common, and shorts circuits between the two signals.
Single Wire Safety (SWS) A unique, safety rated signal that is sent over one wire to indicate a safety status. The
SWS can be used in Category4.
Topic Page
Updated SWS Connections 21
Updated Table 2 23
Updated Table 5 25
Updated Table 7 28
Updated Pulse Testing of Outputs 31
Updated Lock Unlock Request 34
Updated Outputs 35
Updated Agency Certifications 37
Updated Declaration of Conformity 37

6Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Preface
You can view or download publications at rok.auto/literature.
Resource Description
Allen-Bradley Industrial Automation Glossary, publication AG-7.1 A glossary of industrial automation terms and abbreviations.
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1 Provides general guidelines for installing a Rockwell Automation industrial system.
Product Certifications website, rok.auto/certifications. Provides declarations of conformity, certificates, and other certification details.

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 7
Chapter 1
Overview
Hardware Features Figure 1 - GLT Safety Relay
The GLT is a guard locking with time-delay safety relay. This safety relay is
designed to use time-delayed outputs for use in Stop Category 1 and to unlock
a safety gate when the time expires. It also provides a lock command to lock a
safety gate before the hazard starts.
The GLT safety relay can operate with other safety relays in the GSR family, by
use of the single wire safety (SWS) connection. When the GLT safety relay
receives an SWS signal from other GSR relays, the GLT safety relay issues an
unlock command. When the GLT safety relay turns on its safety output, it also
turns on its SWS output for use by other GSR safety relays.
Functions You can configure the GLT safety relay to operate in one of two types of safety
functions, both of which involve time-delayed safety signals.
Function 1 - Guard Locking
Function 1 is used for guard locking applications. During production, a guard
locking interlock locks the safety gate in the closed position. To request access
through the safety gate, the press the Unlock Request button. The GLT safety
relay initiates a stop and unlocks the safety gate after the time expires.
Function 2 - E-stop
Function 2 is used for E-stop applications. The production process requires an
orderly shutdown. Some processes must stop immediately and some must
stop shortly thereafter. To initiate the stop, press an E-stop button. The GLT
safety relay initiates an immediate stop command followed by a delayed stop
command.

8Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 1 Overview
Figure 2 shows some of the key hardware features of the GLT safety relay.
Figure 2 - GLT Safety Relay Hardware Details
Eight Removable Terminals
Five Status Indicators
Three Multi-position Rotary
Configuration Switches
Eight Removable Terminals

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 9
Chapter 2
Installation
Mounting Dimensions Figure 3 - Approximate Dimensions [mm (in.)]
DIN Rail Mounting and Dismounting
The GLT safety relay easily mounts onto 35mm (1.38 in.) DIN rails
[35 x 7.5 x 1mm (1.38 x 0.3 x 0.04 in.) (EN50022 - 35x7.5)].
1. Hold the top of the safety relay at an angle.
2. Slide the safety relay down until the housing catches the DIN rail.
3. Swing the bottom of the safety relay down and push until the latch clips
onto the DIN rail.
Figure 4 - DIN Rail Mounting
113.6 (4.47)
119.14
(4.69)
22.5
(0.88)
DIN Latch
DIN Rail

10 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 2 Installation
Removal
To remove the GLT safety relay, use a screwdriver to pry the DIN rail latch
downwards until the latch is in the unlatched position. Then, swing the safety
relay upward.
Spacing
The GLT safety relay can mount directly next to other GSR safety relays. When
you use the GSR Ethernet module, mount the GSR safety relay with a 10mm
(0.4 in.) gap to maintain effective communication.
Maintain 50.8mm (2in.) of space above and below the safety relay for
adequate ventilation.
Removable Terminals
The GLT safety relay has removable terminals to ease wiring and replacement.
Figure 5 - Removable Terminals
1. Insert the tip of a screwdriver into the slot near the terminal screws.
2. To unlock the terminal block, rotate the screwdriver.
3. Remove the terminal block from the housing.
Enclosure Considerations Most applications require installation in an industrial enclosure to reduce the
effects of electrical interference and environmental exposure. Pollution
Degree 2 is an environment where only non-conductive pollution normally
occurs, except when condensation occasionally causes temporary conductivity.
Overvoltage Category II is the load level section of the electrical distribution
system. At this level, transient voltages are controlled and do not exceed the
impulse voltage capability of the products insulation.
This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in
IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating. This
equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR 11. Without appropriate precautions, there can be difficulties with
electromagnetic compatibility in residential and other environments due to
conducted and radiated disturbances.
This equipment is supplied as open-type equipment. You must mount the
equipment within an enclosure that is suitably designed for those specific
environmental conditions that are present and appropriately designed to help
prevent personal injury that results from accessibility to live parts. The
enclosure must have suitable flame-retardant properties to help prevent, or
minimize, the spread of flame, and comply with a flame spread rating of 5VA,
V2, V1, V0 (or equivalent) if non-metallic. The interior of the enclosure must be
accessible only by the use of a tool. Subsequent sections of this publication
contain additional information regarding specific enclosure-type ratings that
are required to comply with certain product safety certifications.
1
2

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 11
Chapter 2 Installation
For additional information, see publications:
•1770-4.1 for additional installation requirements.
• NEMA Standard 250 and IEC 60529, as applicable, for explanations of the
degrees of protection that is provided by different types of enclosure.
Prevent Excessive Heat For most applications, normal convective cooling keeps the safety relay within
the specified operating range. Verify that the specified temperature range is
maintained. Proper spacing of components within an enclosure is sufficient
for heat dissipation in most applications.
In some applications, other equipment inside or outside the enclosure produce
a substantial amount of heat. In this case, place blower fans inside the
enclosure to help with air circulation and to reduce hot spots near the
controller.
Additional cooling provisions can be necessary when high ambient
temperatures are encountered. Do not bring in unfiltered outside air. Place the
controller in an enclosure to help protect it from a corrosive atmosphere.
Harmful contaminants or dirt can cause improper operation or damage
components. In extreme cases, use air conditioning to help protect against
heat buildup within the enclosure.

12 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 2 Installation
Notes:

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 13
Chapter 3
Power, Ground, and Wire
Wiring Requirements and
Recommendations
• Allow for at least 50 mm (2 in.) between I/O wire ducts or terminal strips
and the safety relay.
• Route incoming power to the safety relay by a path separate from the
device wiring. Where paths must cross, their intersection must be
perpendicular.
• Do not run signal or communications wiring and power wiring in the
same conduit. Route wires with different signal characteristics by
separate paths.
• Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
• Separate input wiring from output wiring.
• Label wiring to all devices in the system. Use tape, shrink-tubing, or
other means to label wires. Colored insulation can also be used to
identify wiring by signal characteristics. For example, use blue for DC
wiring and red for AC wiring.
Wire Size
Each terminal can accommodate copper wire with size from 0.2…2.5 mm
(24…14 AWG). Use copper that withstands 60…75 °C (140…167 °F).
Terminal Torque
Terminals must be torqued to 0.4 N•m (4 lb•in).
Terminal Assignments
Some terminals are designed to have one specific function. Some terminals
can perform multiple functions; configure these terminals during a power-up
routine.
WARNING: Before you install and wire any device, disconnect power to the
system.
WARNING: Calculate the maximum possible current in each power and common
wire. Observe all electrical codes that dictate the maximum current allowable for
each wire size. Current above the maximum ratings causes wiring to overheat,
which can cause damage.

14 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 3 Power, Ground, and Wire
Figure 6 - Terminal Identification
Ground the Controller There are no special grounding requirements. Terminal A2 must connect to
the common of a 24V supply.
Connect the Power Supply An external 24V DC power supply source powers the GLT safety relay.
To comply with the CE Low Voltage Directive (LVD), power for the GLT safety
relay must come from a DC source compliant with safety extra low voltage
(SELV) or protected extra low voltage (PELV).
Table 1 - Terminal Function
Terminal Function
A1 +24V supply
A2 24V common
S11 Safety test pulse output for Channel 1
S21 Safety test pulse output for Channel 2
S12 Safety input for Channel 1
S22 Safety input for Channel 2
S44 Reset and lock request input
S54 Guard locking unlock request input
Y32 Auxiliary non-safety output
L11 Single wire safety output
L12 Single wire safety input
B2 Retriggerable input
51 Guard locking solenoid or delayed safety output Channel 1
L61 Guard locking solenoid or delayed safety output Channel 2
14 Immediate safety output Channel 1 - Logic setting 1, 2, 5, 6, 7, 8
Delayed safety output Channel 1 – Logic setting 3, 4
24 Immediate safety output Channel 2 - Logic setting 1, 2, 5, 6, 7, 8
Delayed safety output Channel 2 – Logic setting 3, 4
S12 S22 B2 S54
A1 A2 S11 S21
X2
X1 X1 X2
X3
X4
X3 X4
PWR/Fault
IN1
51/L61
Logic IN
OUT
L12 L11 Y32 S44
14 24 51 L61

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 15
Chapter 3 Power, Ground, and Wire
The following Rockwell Automation® Bulletin 1606 power supply catalog
numbers are SELV- and PELV-compliant.
• 1606-XLP30E
• 1606-XLP50E
• 1606-XLP50EZ
• 1606-XLP72E
• 1606-XLP95E
• 1606-XLDNET4
• 1606-XLSDNET4
Figure 7 - Power Supply Connections
Safety Devices Safety Devices with Mechanical Contacts
Input devices with mechanical contact outputs, such as E-stop buttons and
tongue interlock switches, use both a safety input terminal and a test pulse
output terminal.
When safety devices are connected via test outputs to an input circuit on the
GLT safety relay, the wire length must be 100 m (300 ft) or less.
For the lowest risk levels, the input device uses one channel. Shown in Figure 8,
one side of the contact connects to S11 (or S21). The other side of the contact
must connect to both S12 and S22. The GLT safety relay detects short circuits
from the inputs (S12 and S22) to 24V DC and to 24V common.
Figure 8 - Connecting a Single-channel Mechanical Contact
Connect +24V DC
to Terminal A1 Connect 24V Common
to Terminal A2
14
OUT
S11 S21
S22 S54S12
A1
PWR/Fault
IN 1
51/L61
Logic IN
RANGE
TIME
51
A2
L61
L12 L11 Y32 S44
B2
24
GLT
LOGIC
1
2
4
3
5
6
7
8
9
0
1
2
4
3
5
6
7
8
9
10
01
2
3
4
5
6
7
8
9
S12 S22
GLT
Safety
Device
S11 S21
Safety
Device

16 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 3 Power, Ground, and Wire
Figure 9 - Connect Mechanical Contacts of a Dual-channel E-stop
When only one dual-channel E-stop button is used, the maximum safety
performance rating is Cat 4 PLe and SIL CL 3.
Figure 10 - Connect Mechanical Contacts of a TLS3-GD2 Interlock Switch
Since the TLS3-GD2 interlock switch has multiple contacts in series, the
maximum safety performance rating is Cat 3 PLd and SIL CL 2.
Regardless of how these switches are wired, performance remains the same.
The GLT safety relay successfully recognizes when one or both channels open,
and the GLT safety relay detects cross-channel faults and single channel faults
to +24V and to 24V common.
Safety Devices with OSSD Outputs
Devices, such as safety light curtains, laser scanners, and solid-state interlocks
have current-sourcing PNP semiconductor outputs (OSSD), which send safety
signals to the GLT safety input terminal and do not use the pulse test outputs.
These devices must have a common power supply reference with the GLT
safety relay.
Figure 11 - Connections to Device with OSSD Outputs
Pulse test output S11 can connect to either S12 or S22. Pulse test output S21 can
connect to either S12 or S22.
S12 S22
GLT
S11 S21
Safety
Gate
12 22 34
11 21 33
A1
A2 42
41
52
51
S12 S22
GLT
S11 S21
TLS3-GD2
Safety
Gate
S12 S22
GLT
S11 S21 A1
A2
+24V DC
TLS-Z &
440G-LZ
OSSD1
OSSD2
24V DC Com

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 17
Chapter 3 Power, Ground, and Wire
When using the TLS-ZR and 440G-LZ guard locking switches, the maximum
safety performance rating is Cat 4 PLe and SIL CL 3.
Unlock Request Input The unlock request input can connect to the 24V supply through a momentary,
N.O. push-button switch or to a 24V sourcing output of a programmable logic
controller (PLC), where the PLC turns the request on or off. Some examples of
Rockwell Automation PLC output modules are shown in Figure 12.
The unlock request connects to terminal S54.
Figure 12 - Unlock Request Wiring
Lock and Reset Request
Input
The lock and reset input can connect to the 24V supply through a momentary,
N.O. push-button switch or to a 24V sourcing output of a PLC where the PLC
turns the request on or off. Some examples of Rockwell Automation PLC
output modules are shown in Figure 13 on page 18.
In some safety system applications, the reset signal also serves as a monitoring
function. For example, when the safety outputs are driving safety contactors,
the N.C. contacts of the safety contactors must connect in series with the lock
and reset circuit.
The lock and reset request connects to terminal S44.
IMPORTANT Both devices must have the same power supply reference.
OSSD1 can connect to either S12 or S22 and OSSD2 can connect to either S12 or S22.
+24V DC
24V DC Com
+
1
2
3
Momentary
Normally-Open
Push Button
PLC Output
1756-OB16
1769-OB8
1746-OB4
1734-OB2
1793-OB4
PLC
Processor
GLT
S54
A1
A2
GLT
S54
A1
A2
Momentary
N.O. Push
Button

18 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 3 Power, Ground, and Wire
Figure 13 - Lock Request Wiring
Lock and Unlock Signals The GLT safety relay is designed to ignore incidental actuations or stuck
conditions on the lock and unlock inputs. The lock and unlock signals must be
actuated for a duration of 0.25...3 seconds. The GLT safety relay ignores signals
durations that are too short or too long.
Figure 14 - Required Signal Duration
Retriggerable Input The retriggerable input is either left open for non-retriggerable operation or
connected directly to the +24V DC supply for retriggerable operation. During
configuration, the GLT safety relay reads the status of the input to determine
whether to apply the function to the safeguarding input. The retriggerable
input only works with logic setting 5, 6, 7, and 8. Retriggerable operation is
often used when long delay times are configured in the GLT safety relay.
When terminal B2 is not connected to +24V DC, the safeguarding input device
must be held open for the full duration of the timed delay cycle. If the input
device is reclosed during the timing cycle, the PWR/Fault status indicator is
green with five red flashes. To clear the fault indication, cycle the input device
(off then on) after the completion of the timing cycle.
When terminal B2 connects to +24V DC, the safeguarding input device can
close before the full duration of the timed delay cycle, and this action resets the
timer. When the input recloses during the timing cycle, the immediate outputs
turn back on immediately.
+24V DC
24V DC Com
+
1
2
3
Momentary
Normally-Open
Push Button
PLC Output
1756-OB16
1769-OB8
1746-OB4
1734-OB2
1793-OB4
PLC
Processor
GLT
S44
A1
A2
GLT
S44
A1
A2
Contactor
Monitoring
Momentary
N.O. Push
Button
Contactor
Monitoring
+24V DC
250…3000 ms
24V DC Com
WARNING: Confirm that the reclosing or resetting of an interlocking safeguard
or E-stop device does not initiate hazardous machine operation.

Rockwell Automation Publication 440R-UM010D-EN-P - September 2022 19
Chapter 3 Power, Ground, and Wire
Figure 15 - Retriggerable Input Wiring
Outputs Terminals 51 and L61 are the time-delayed safety outputs. They can be
configured for one of two different functions:
1. Direct connection to the solenoid of a guard locking interlock
2. Direct connection to other time-delayed safeguarding devices
The function is determined during the configuration process.
Figure 16 - TLS1, 2, and 3 Solenoid Connections
(1) The 440G-MT solenoid cannot connect directly to the GLT safety relay, as it draws too much current; an interposing relay is
required.
When using the TLS1, 2, or 3, the solenoid connections can be reversed, A1 can
connect to 51 or L61 and A2 can connect to either 51 or L61.
Figure 17 - TLS-Z and 440G-LZ Solenoid Connections
When connecting to the TLS-Z or 440G-LZ guard locking switch, the solenoid
signal must connect to terminal 51. Terminal L61 can also be used to drive a
relay.
When multiple guards (solenoids) must unlock simultaneously, you can
connect a safety control relay between terminal 51 and L61, or you can connect
two separate safety control relays to 51 and L61. A diode suppressor must
connect in parallel across the coil.
+24V DC
24V DC Com
GLT
B2A1
A2
GLT
B2A1
A2
Safety
Gate
12 22 34
11 21 33
A1
A2 42
41
52
51
L61
GLT
51
TLS3-GD2
Safety
Gate
(1)
GLT
51 A1
A2
+24V DC
TLS-Z &
440G-LZ
24V DC Com

20 Rockwell Automation Publication 440R-UM010D-EN-P - September 2022
Chapter 3 Power, Ground, and Wire
Figure 18 - Interposing Safety Relay Connections
Use Surge Suppressors Because of the potentially high current surges that occur when you switch
inductive load devices, such as motor starters and solenoids, you must use
some type of surge suppression to help protect and extend the operating life of
the output of the controller. By adding a suppression device directly across the
coil of an inductive device, you prolong the life of the outputs. You also reduce
the effects of voltage transients and electrical noise from radiating into
adjacent systems.
Figure 19 shows an output with a suppression device. We recommend that you
locate the suppression device as close as possible to the load device. Since the
outputs are 24V DC, we recommend 1N4001 (50V reverse voltage) to 1N4007
(1000V reverse voltage) diodes for surge suppression for the OSSD safety
outputs, as shown in Figure 19. The diode must connect as close as possible to
the load coil.
Figure 19 - Surge Suppression
Example suppressors include the following catalog numbers:
• 100-FSD250 for legacy Bulletin 100S contactors
•100S-CxxEJ contactors have built in suppression
• 1492-LD4DF terminal block with built-in 1N4007 diode
• 700-ADL1R is the diode for catalog number 700-HPSXZ24
positive-guided relay
Single Wire Safety (SWS) The GLT safety relay has two single wire safety connections:
• Terminal L12 (input)
• Terminal L11 (output)
These terminals can only connect to other devices that support single wire
safety. When the SWS input is on, the Logic IN status indicator turns on.
GLT
L61
51 A1
A2
+24V DC
24V DC Com
CR1 GLT
L6151
A1
A2
CR1 CR2
GLT
L61512414
A1
A2
+24V DC
24V DC Com
K2 K3 K4K1