Rockwell Automation Allen-Bradley 440R-GL2S2T User manual

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

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.
Labels may also be on or inside the equipment to provide specific precautions.
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).

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 3
Table of Contents
Preface Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 1
Overview Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function 1 - Guard Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Function 2 - E-stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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 Recommendation . . . . . . . . . . . . . . . . . . . . 13
Wire Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal Torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Grounding the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Connecting a Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Safety Devices with Mechanical Contacts. . . . . . . . . . . . . . . . . . . . 16
Safety Devices with OSSD Outputs . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unlock Request Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Lock and Reset Request Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Lock and Unlock Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Retriggerable Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Use Surge Suppressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Single Wire Safety (SWS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SWS Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SWS Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Table of Contents
Chapter 4
Configuration Logic Switch Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Range Switch Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Time Switch Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Configuration Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Configuration Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Five Step Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configuration Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Chapter 5
Diagnostic Status Indicators and
Troubleshooting
Status Indicators During Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Status Indicators During Normal Operation. . . . . . . . . . . . . . . . . . . . . 29
Status Indicators During Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Additional Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Chapter 6
Pulse Testing Functions Pulse Testing for Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Pulse Testing of Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Appendix A
Specifications General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Inputs IN1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Lock Unlock Request. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Retrigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Lock Unlock Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Auxiliary Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Single Wire Safety Input Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Single Wire Safety Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Recovery Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Response Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Appendix B
Regulatory Approvals Agency Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Compliance to European Union Directives. . . . . . . . . . . . . . . . . . . . . . 41
Machine Safety Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SIL Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Performance Level/Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 5
Preface
Read this preface to familiarize yourself with the rest of the manual. It provides
information concerning:
• Who should use this manual
•The purpose of this manual
• Related documentation
• Conventions that are used in this manual
Summary of Changes This manual contains the following new and updated information:
•The section Single Wire Safety (SWS) on page 21 was added.
• In the section Status Indicators During Diagnostics on page 30, the
descriptions of Green with Flashing Red 3 Times and Green with
Flashing Red 4 Times were updated.
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.
Purpose of This Manual This manual is a reference guide for the GLT time delay safety relay and
accessories. It describes the procedures that you use to install, wire, and
troubleshoot your controller. This manual:
• Explains how to install and wire your safety relay
• Gives an overview of the GLT safety relay performance
Additional Resources These documents contain additional information concerning related products
from Rockwell Automation.
You can view or download publications at
http://www.rockwellautomation.com/literature/. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.
Resource Description
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
Provides general guidelines for installing a
RockwellAutomation® industrial system.
Product Certifications website, http://www.ab.com Provides declarations of conformity, certificates, and
other certification details.
Allen-Bradley® Industrial Automation Glossary, AG-7.1 A glossary of industrial automation terms and
abbreviations.

6Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Preface
Definitions The Industrial Automation Glossary (publication AG-7.1) contains a glossary
of terms and abbreviations that are used by Rockwell Automation to describe
industrial automation systems. The following list of specific terms and
abbreviations that are used in this manual:
•N.C. (Normally Closed) – An electrical contact whose normal state
(that is, no pressure or electrical potential applied) is in the closed
position.
•N.O. (Normally Open) – An electrical contact whose normal state
(that is, 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 are pulled up 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.

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 7
Chapter 1
Overview
Hardware Features Figure 1 - GLT 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 starting of the hazard.
The GLT safety relay can be operated with other safety relays in the GSR
family, by use of the single wire safety (SWS) connection. When 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 The GLT safety relay can be configured 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, the
safety gate is locked in the closed position by a guard locking interlock. To
request access through the safety gate, the operator presses the Unlock Request
button. The GLT safety relay initiates a stop and unlocks the safety gate after
the time expires.

8Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 1 Overview
Function 2 - E-stop
Function 2 is used for E-stop applications. The production process requires an
orderly shutdown. Some processes must be stopped immediately and some
must be stopped shortly thereafter. To initiate the stop, you press an E-stop
button. The GLT safety relay initiates an immediate stop command followed
by a delayed stop command.
Figure 2 shows some of the key hardware features of the GLT safety relay.
Figure 2 - GLT Hardware Details
8 Removable Terminals
5 Status Indicators
3 Multi-position Rotary
Configuration Switches
8 Removable Terminals

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 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 DIN Rails: 35x7.5x1mm
(EN50022 - 35x7.5).
1. Hold the top at an angle
2. Slide down until the housing catches the rail.
3. Swing the bottom down and give a little push until the latch clips onto
the 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-UM010C-EN-P - September 2016
Chapter 2 Installation
Removal - To remove the GLT safety relay, use a screwdriver to pry the DIN
rail latch downwards until it is in the unlatched position. Then, swing the
module up.
Spacing - The GLT safety relay can be mounted directly next to other GSR
safety relays. When the GSR Ethernet Module is used, the GSR must be
mounted with 10mm (0.4 in.) of its neighboring module to maintain effective
communication.
Maintain 50.8mm (2in.) of space above and below the 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 small screwdriver into the slot near the terminal
screws.
2. Rotate the screwdriver to unlock the terminal block.
The terminal block can then be removed 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 normally only non-conductive pollution
occurs except that 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 may be difficulties
with electromagnetic compatibility in residential and other environments due
to conducted and radiated disturbances.
1
2

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 11
Installation Chapter 2
This equipment is supplied as open-type equipment. It must be mounted
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.
For additional information, see:
• Industrial Automation Wiring and Grounding Guidelines,
RockwellAutomation publication 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 relay within the
specified operating range. Verify that the specified temperature range is
maintained. Proper spacing of components within an enclosure is usually
sufficient for heat dissipation.
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 could 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 could cause improper operation or damage to
components. In extreme cases, you may need to use air conditioning to help
protect against heat buildup within the enclosure.

12 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 2 Installation
Notes:

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 13
Chapter 3
Power, Ground, and Wire
Wiring Requirements and
Recommendation
• Allow for at least 50 mm (2 in.) between I/O wire ducts or terminal
strips and the relay.
• Route incoming power to the 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 for 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.
Terminal Torque
Terminals must be torqued to 0.4 N•m (4 lb•in).
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 cause
wiring to overheat, which can cause damage.

14 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Terminal Assignments
Some terminals are designed to have one specific function. Some terminals can
perform multiple functions; these terminals must be configured during a
power-up routine.
Figure 6 - Terminal Identification
Table 1 - Terminal Function
Grounding the Controller There are no special grounding requirements. Terminal A2 must be connected
to the common of a 24V supply.
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 Nonsafety 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-UM010C-EN-P - September 2016 15
Power, Ground, and Wire Chapter 3
Connecting a Power Supply Power for the GLT safety relay is provided by an external 24V DC power
supply source.
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).
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
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
12
43
5
6
7
8
9
0
12
4
3
5
6
7
8
9
10
012
3
4
5
6
7
8
9

16 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Safety Devices Safety Devices with Mechanical Contacts
Input devices with mechanical contact outputs, such as emergency 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, wire length must be 100 m (300 ft) or less.
For the lowest risk levels, the input device uses one channel. As shown in
Figure 8, one side of the contact is connected to S11 (or S21). The other side of
the contact must be connected 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
Figure 9 - Connecting 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 CL3.
Figure 10 - Connecting Mechanical Contacts of a TLS3-GD2 Interlock Switch
S12 S22
GLT
Safety
Device
S11 S21
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

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 17
Power, Ground, and Wire Chapter 3
Since the TLS3-GD2 interlock switch has multiple contacts in series, the
maximum safety performance rating is Cat 3 PLd and SIL CL2.
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 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
When using the TLS-ZR and 440G-LZ guard locking switches, the maximum
safety performance rating is Cat 4 PLe and SIL CL3.
TIP Pulse test output S11 can be connected to either S12 or S22. Pulse test
output S21 can be connected to either S12 or S22.
IMPORTANT Both devices must have the same power supply reference.
TIP OSSD1 can be connected to either S12 or S22 and OSSD2 can be connected to
either S12 or S22.
S12 S22
GLT
S11 S21 A1
A2
+24V DC
TLS-Z &
440G-LZ
OSSD1
OSSD2
24V DC Com

18 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Unlock Request Input The Unlock Request Input can be connected to the 24V supply through a
momentary, normally open 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 is connected to Terminal S54.
Figure 12 - Unlock Request Wiring
Lock and Reset Request
Input
The Lock and Reset Input can be connected to the 24V supply through a
momentary, normally open 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.
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 normally closed contacts of the safety contactors should be connected in
series with lock and reset circuit.
The lock and reset request is connected to Terminal S44.
Figure 13 - Lock Request Wiring
+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
+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

Rockwell Automation Publication 440R-UM010C-EN-P - September 2016 19
Power, Ground, and Wire Chapter 3
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 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 is connected to +24V DC, the safeguarding input device
can be closed before the full duration of the timed delay cycle, and this action
resets the timer. When the input is reclosed during the timing cycle, the
immediate outputs turn back ON immediately
Figure 15 - Retriggerable Input Wiring
+24V DC
250ms to 3000ms
24V DC Com
WARNING: You must confirm that the reclosing or resetting of an
interlocking safeguard or E-stop device does not initiate hazardous machine
operation.
+24V DC
24V DC Com
GLT
B2
A1
A2
GLT
B2
A1
A2

20 Rockwell Automation Publication 440R-UM010C-EN-P - September 2016
Chapter 3 Power, Ground, and Wire
Outputs Terminals 51 and L61 are the time-delayed safety outputs. They can be
configured for two different functions:
1. Direct connection to the solenoid of a guard locking interlock, or
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
When using the TLS1, 2, or 3, the solenoid connections can be reversed, A1
can be connected to 51 or L61 and A2 can be connected to either 51 or L61.
Note: The 440G-MT solenoid cannot be connected directly to the
GLT safety relay as it draws too much current; an interposing relay is
required.
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 be connected to terminal 51. Terminal L61 can also be
used to drive a relay.
When multiple guards (solenoids) must be unlocked simultaneously, a safety
control relay can be connected between terminal 51 and L61 or two separate
safety control relays can be connected to 51 and L61. A diode suppressor
should be connected in parallel across the coil.
Figure 18 - Interposing Relay Connections
Safety
Gate
12 22 34
11 21 33
A1
A2 42
41
52
51
L61
GLT
51
TLS3-GD2
GLT
51 A1
A2
+24V DC
TLS-Z &
440G-LZ
24V DC Com
GLT
L61
51 A1
A2
+24V DC
24V DC Com
CR1 GLT
L6151
A1
A2
CR1 CR2