Rockwell Automation Allen-Bradley 1753-OW8 User manual

Installation Instructions
GuardPLC Relay Output Module
Catalog Number 1753-OW8
Topic Page
Important User Information 2
About the 1753-OW8 Relay Output Module 3
General Safety 3
Install the Module 4
Mount the Module 5
Ground the Module 6
Wire the Module 6
Make Safety-related Communication Connections 8
Reset Push Button 9
Status Indicators 10
Specifications 11
Additional Resources 15

2GuardPLC Relay Output Module
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Important User Information
Solid-state equipment has operational characteristics differing from those of electromechanical equipment.
Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication
SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.rockwellautomation.com/literature/) describes some important differences between solid-state
equipment and hard-wired electromechanical devices. Because of this difference, and also because of the
wide variety of uses for solid-state equipment, all persons responsible for applying this equipment must
satisfy themselves that each intended application of this equipment is acceptable.
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.
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
consequences.
SHOCK HAZARD: Labels may be on or inside the equipment, for example,
drive or motor, to alert people that dangerous voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example,
drive or motor, to alert people that surfaces may reach dangerous
temperatures.
IMPORTANT Identifies information that is critical for successful application and
understanding of the product.

GuardPLC Relay Output Module 3
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
About the 1753-OW8 Relay Output Module
The 1753-OW8 relay output module is a distributed I/O module for use with GuardPLC
controllers. The module features eight relay outputs as shown below.
General Safety
Prevent Electrostatic Discharge
ATTENTION: Personnel responsible for the application of safety-related
programmable electronic systems (PES) shall be aware of the safety
requirements in the application of the system and shall be trained in using the
system.
ATTENTION: This equipment is sensitive to electrostatic discharge, which can
cause internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:
•Touch a grounded object to discharge static potential.
•Wear an approved wrist-strap grounding device.
•Do not touch connectors or pins on component boards.
•Do not touch circuit components inside the equipment.
•Use a static-safe workstation, if available.
•Store the equipment in appropriate static-safe packaging when not in use.
1753-OW8
8 Digital Outputs
DO1
1 2
DO5 DO6 DO7 DO8
DO2
3 4
DO3
5 6
DO4
7 8
9 10 11 12 13 14 15 16
L-L- L+ L+
24V DC
Relay Outputs (1…4)
Relay Outputs (5…8)
Voltage Supply
Connection
Ethernet Ports
(on bottom of controller)

4GuardPLC Relay Output Module
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Environment and Enclosure
Install the Module
Follow these steps to install the 1753-OW8 module.
1. Mount the module to a DIN rail.
2. Ground the module.
3. Wire the module.
4. Make communication connections.
This publication describes these steps in detail.
ATTENTION: This equipment is intended for use in a Pollution Degree 2
industrial environment, in overvoltage Category II applications (as defined in
IEC publication 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 as well as radiated disturbances.
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 will be present and appropriately designed to prevent personal
injury resulting from accessibility to live parts. The enclosure must have
suitable flame-retardant properties to prevent or minimize the spread of flame,
complying 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 may contain additional
information regarding specific enclosure type ratings that are required to
comply with certain product safety certifications.
In addition to this publication, see:
•Industrial Automation Wiring and Grounding Guidelines, Rockwell
Automation publication 1770-4.1, for additional installation requirements.
•NEMA 250 and IEC 60529, as applicable, for explanations of the degrees of
protection provided by different types of enclosure.

GuardPLC Relay Output Module 5
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Mount the Module
The terminal connections meet the protection requirements according to IP20. For higher
requirements, the 1753-OW8 must be mounted in an enclosure. The clearance and creepage
distances are designed for overvoltage category 2 up to 300 V according to IEC 61131-2.
The module cannot be panel-mounted. Mount the module to a DIN rail by following these
steps.
1. Hook the top slot over the DIN rail.
2. Insert a flathead screwdriver into the gap
between the housing and the latch and pull
the latch downward.
3. Hold the latch down as you push the housing
back onto the DIN rail.
4. Release the latch to lock the device onto the
rail.
IP Address Label
Use the transparent label shipped with the module to note the IP Address and System ID (SRS).
IMPORTANT For effective cooling, mount the module following these guidelines.
•Mount the module horizontally.
•Provide a gap of at least 100 mm (3.94 in.) above and below the module.
•Select a location where air flows freely or use an additional fan.
•Do not mount the module over a heating device.
TIP To remove the module from the DIN rail, insert a flathead screwdriver into the
gap between the housing and the latch and pull the latch downward as you lift
the module off of the rail.
IMPORTANT If you attach the label to the module, make sure you do not cover any of the
ventilation slots.
DIN Rail
(1) Top Slot
Latch
(3)
(2)

6GuardPLC Relay Output Module
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Ground the Module
The module is functionally grounded through its DIN rail connection. A protective earth
ground connection is required and is provided through a separate grounding screw on the upper
left of the housing and marked with the grounding symbol .
You must also provide an acceptable grounding path for each device in your application. For
more information on proper grounding guidelines, refer to the Industrial Automation Wiring
and Grounding Guidelines, publication 1770-4.1.
Wire the Module
The following sections describe how to connect the voltage supply and connect the relay outputs.
Connect the Voltage Supply
To comply with CE Low Voltage Directives (LVD) and UL restrictions, you must use either a
Safety Extra Low Voltage (SELV), or a Protected Extra Low Voltage (PELV) power supply to
power this adapter. A SELV supply cannot exceed 30V rms, 42.4V peak, or 60V DC under
normal conditions and under single-fault conditions. A PELV supply has the same rating and is
connected to protected earth.
The supply voltage is connected via a 4-pin connector that accommodates wire sizes up to
2.5 mm2(14 AWG). You need to connect only one wire to L+ and one wire to L-. Both L+ and
L- terminals are internally connected, so you can daisy-chain 24V DC power from the module to
other devices in the panel by using the remaining terminal.
ATTENTION: This product is grounded through the DIN rail to chassis ground.
Use zinc-plated yellow-chromate steel DIN rail to assure proper grounding. The
use of other DIN rail materials (for example, aluminum or plastic) that can
corrode, oxidize, or are poor conductors, can result in improper or intermittent
grounding. Secure DIN rail to mounting surface approximately every 200 mm
(7.8 in.) and use end-anchors appropriately.
IMPORTANT Protect the module with a 10 A slow-blow fuse.
ATTENTION: Do not reverse the L+ and L- terminals or damage to the module
will result. There is no reverse polarity protection.

GuardPLC Relay Output Module 7
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Connect Safety-related Relay Outputs
The module has eight relay outputs whose status is indicated via status indicators.
An output is in a safety state when it is de-energized. When an internal (non-communication)
fault occurs, all outputs are switched off.
Each output of the module is fitted with two safety relays with positively guided contacts and
one MSR-type relay.
Relay outputs are connected to these terminals. See the wire size and terminal torque
specifications on page 11.
The output contacts are connected in pairs via terminal connectors (numbered terminals). The
terminal pins on the front plate of the module have the same numbering sequence to help
prevent miswiring.
For the connection of higher voltages (110/220V AC) besides SELV or PELV, suitable cables
must be used with double or reinforced insulation.
Internal non-replaceable fuses are used to limit the switching current of the relay contact circuits
to 60% of the maximum admissible AC switching current. For DC switching, the relay contact
circuits must be additionally equipped with an external fuse rated no higher than the maximum
admissible DC switching capacity.
Errors in one or more channels are indicated by the FAULT status indicator. In addition, the
system status can be evaluated in the user program.
Terminal Number Designation Relay Output
1 DO1 Contact 1, terminal A
2 Contact 1, terminal B
3 DO2 Contact 2, terminal A
4 Contact 2, terminal B
5 DO3 Contact 3, terminal A
6 Contact 3, terminal B
7 DO4 Contact 4, terminal A
8 Contact 4, terminal B
9 DO5 Contact 5, terminal A
10 Contact 5, terminal B
11 DO6 Contact 6, terminal A
12 Contact 6, terminal B
13 DO7 Contact 7, terminal A
14 Contact 7, terminal B
15 DO8 Contact 8, terminal A
16 Contact 8, terminal B

8GuardPLC Relay Output Module
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
If the 1753-OW8 module faults, all eight outputs are switched off. This is indicated by the Fault
status indicator.
Output Connection Example
Make Safety-related Communication Connections
The module has two 10/100BaseT, RJ45 connectors on the bottom side of the unit to provide
communication to the GuardPLC controller via GuardPLC Ethernet protocol. Because this is
an Ethernet switch, you can daisy-chain connections from the GuardPLC controller to other
distributed I/O modules. The switch is auto-detect. Use either crossover or straight-through
shielded Ethernet cabling.
Star or line configurations are available. Make sure that a network loop is not generated. Data
packets must be able to reach a node only via a single path. Ring topology is not supported.
TIP For more information on output wiring, see the GuardPLC System User Manual,
publication 1753-UM001.
IMPORTANT In the event of a communication fault between the GuardPLC controller and
the 1753-OW8 module, the relay outputs will be set to their initial value. The
initial value is configured during signal creation in the hardware management
window of RSLogix Guard PLUS! software.
TIP The media access control (MAC) address of the module is printed on the label
positioned over both lower RJ45 connections.
DO 1 DO 2
12 34

GuardPLC Relay Output Module 9
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Reset Push Button
The module is equipped with a reset pushbutton. Reset via the push button is necessary under
the following conditions.
•You forget the password to go online via the programming software.
•You are unable to determine the IP address and SRS of the controller.
The push button is accessible through a small round hole at the top of the housing,
approximately 4…5 cm (1.6 …2.0 in.) from the left rim and recessed approximately 9.5 mm
(0.375 in.).
To reset, press and hold the push button for 20 seconds while rebooting the device by cycling
power. Pressing the Reset push button during operation has no affect.
With activation of the reset button:
•all accounts are deleted except for the default account.
•IP Address and System ID (SRS) are set to their default values.
The next time you cycle power, these settings will be restored to the last values stored into
nonvolatile memory. This means that either the settings prior to the reset will be restored, or if
any settings were changed after the reset, those new settings will still be in effect.
IMPORTANT Activate the reset push button using an insulated pin to prevent short-circuits.

10 GuardPLC Relay Output Module
Rockwell Automation Publication 1753-IN012C-EN-P - June 2010
Status Indicators
Indicator Status Description
24V DC On 24V DC operating voltage present.
Off No operating voltage.
RUN On This is the normal status of the module.
A routine, which has been loaded into the module, is executed.
The module processes input and output signals, carries out communication, and
performs hardware and software tests.
Flashing The module is in STOP mode and is not executing a routine.
All system outputs are reset.
STOP mode can be triggered by setting the Emergency stop system variable to TRUE
in the routine, or by direct command from the programming software.
Off The module is in ERROR_STOP (see ERROR).
ERROR On •A hardware error has been detected by the module. The module goes to
ERROR_STOP and the execution of the routine is halted. Hardware errors are
errors in the module, errors in one or more of the digital input and output
modules, or errors in the counters.
•A software error in the operating system has been detected by the module.
•The watchdog has reported an error due to exceeded cycle time.
All system outputs are reset and the module ceases all hardware and software tests.
The module can only be restarted by a command from the programming software.
Off No errors are detected.
PROGress On The upload of a new module configuration is in progress.
Flashing The upload of a new operating system into the nonvolatile ROM is in progress.
Off No upload of module configuration or operating system in progress.
FORCE On The module is executing a routine (RUN) and FORCE mode is activated by the user.
Flashing The module is in STOP, but Forcing has been initiated and will be activated when the
module is started.
Off Forcing is OFF.
FAULT On •The routine (logic) has caused an error.
•The module configuration is faulty.
•The upload of a new operating system was not successful and the operating
system is corrupted.
Flashing An error has occurred during a nonvolatile ROM write cycle.
One or more I/O errors have occurred.
Off None of the above errors has occurred.
OSL Flashing Emergency Operating System Loader is active.
BL Flashing Boot Loader unable to load operating system or unable to start COMM operating
system loader.
Module status can be interrogated through the programming software. For more information, refer to the
GuardPLC System User Manual, publication 1753-UM001.