Rockwell Automation Allen-Bradley 1769-OF4 User manual

Compact I/O Analog Output Module
Catalog Number 1769-OF4
User Manual

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.
Allen-Bradley, Rockwell Automation, Rockwell Software, Compact I/O, CompactLogix, MicroLogix, RSLogix 500, RSLogix 5000, RSNetWorx for DeviceNet, and TechConnect are trademarks of
Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
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.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
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
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.

3Publication 1769-UM020A-EN-P - December 2009 3
Table of Contents
Preface
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Who Should Use This Publication . . . . . . . . . . . . . . . . . . . . . 7
Additional Resources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 1
Overview Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Module Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Module Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 2
Installation and Wiring Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Hazardous Location Considerations . . . . . . . . . . . . . . . . 14
Preventing Electrostatic Discharge . . . . . . . . . . . . . . . . . 14
Removing Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reduce Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Protect the Circuit Board from Contamination . . . . . . . . . 15
Assemble the Compact I/O System . . . . . . . . . . . . . . . . . . . 16
Mounting the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Mount to a Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mount to a DIN Rail. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Replace a Single Module Within a System . . . . . . . . . . . . . . 19
Grounding the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
System Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Effect of Transducer/Sensor and Cable Length Impedance
on Voltage Output Accuracy. . . . . . . . . . . . . . . . . . . . . . 22
Label the Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Remove the Finger-safe Terminal Block . . . . . . . . . . . . . . . . 23
Wire the Finger-safe Terminal Block . . . . . . . . . . . . . . . . . . 24
Wire Size and Terminal Screw Torque . . . . . . . . . . . . . . 25
Wire the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 3
Module Data, Status, and Channel
Configuration
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Input Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Output Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
General Status Bits (S0…S3) . . . . . . . . . . . . . . . . . . . . . . 31
Over-range (high clamp) Status Bits (O0…O3) . . . . . . . . 31

4Publication 1769-UM020A-EN-P - December 2009
Table of Contents
Under-range (low clamp) Status Bits (U0…U3) . . . . . . . . 32
Output Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Cancel Clamp Alarm Latch Control Bits (CLO0…CLO3
and CHO0…CHO3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Enable/Disable Channel (EC) . . . . . . . . . . . . . . . . . . . . . 35
Program Mode (PM). . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Program Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Fault Mode (FM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Fault Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Program to Fault Enable (PFE) . . . . . . . . . . . . . . . . . . . . 36
Clamping (limiting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Clamp High and Clamp Low Data Values . . . . . . . . . . . . 37
Output Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Type/Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Data Format Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chapter 4
Module Diagnostics and
Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Power Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Activate Devices When Troubleshooting . . . . . . . . . . . . . 44
Stand Clear of the Machine. . . . . . . . . . . . . . . . . . . . . . . 44
Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Power Cycle Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Output Clamp Detection . . . . . . . . . . . . . . . . . . . . . . . . 45
Non-critical versus Critical Module Errors . . . . . . . . . . . . . . . 45
Module Error Definition Table . . . . . . . . . . . . . . . . . . . . . . . 46
Module Error Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Extended Error Information Field . . . . . . . . . . . . . . . . . . 46
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Invalid Output Range Selected . . . . . . . . . . . . . . . . . . . . 48
Invalid Output Format Selected . . . . . . . . . . . . . . . . . . . 48
Invalid Fault Value Selected . . . . . . . . . . . . . . . . . . . . . . 49
Invalid Program/Idle Value Selected(1) . . . . . . . . . . . . . . 49
Invalid Clamp Value Selected . . . . . . . . . . . . . . . . . . . . . 49
Invalid Ramp Rate Selected(1) . . . . . . . . . . . . . . . . . . . . . 49
Module Inhibit Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . . 50

Publication 1769-UM020A-EN-P - December 2009 5
Table of Contents
Appendix A
Specifications Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
General Specifications – 1769-OF4. . . . . . . . . . . . . . . . . . . . 51
Output Specifications – 1769-OF4 . . . . . . . . . . . . . . . . . . . . 52
Certifications – 1769-OF4. . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Appendix B
Module Addressing and
Configuration with MicroLogix
1500 Controller
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Module Input Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Module Output Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Module Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Configure Analog I/O Modules in a MicroLogix 1500
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Appendix C
Configuration Using the RSLogix
5000 Generic Profile for
CompactLogix Controllers
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Add the Module to Your Project . . . . . . . . . . . . . . . . . . . . . 61
Configure Each I/O Module. . . . . . . . . . . . . . . . . . . . . . . . . 64
Appendix D
Two’s Complement Binary
Numbers
Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Glossary
Index

6Publication 1769-UM020A-EN-P - December 2009
Table of Contents

7Publication 1769-UM020A-EN-P - December 2009 7
Preface
Introduction
Read this preface to familiarize yourself with the rest of the manual.
About This Publication
This manual is a guide for using the Compact I/O Analog Output
Module, catalog number 1769-OF4. It describes the procedures you
use to configure, operate, and troubleshoot your module.
For detailed information on related topics like programming your
CompactLogix or MicroLogix controller, or DeviceNet adapter, or for
information on CompactLogix components, see the list of Additional
Resources on page 8.
Who Should Use This
Publication
Use this manual if you are responsible for designing, installing,
programming, or troubleshooting control systems that use Compact
I/O modules.
Topic Page
About This Publication 7
Who Should Use This Publication 7
Additional Resources 8

8Publication 1769-UM020A-EN-P - December 2009
Preface
Additional Resources
These documents contain additional information about control
systems that use Compact I/O modules.
You can view or download publications at
http://literature.rockwellautomation.com. To order paper copies of
technical documentation, contact your local Rockwell Automation
distributor or sales representative.
Resource Description
MicroLogix 1500 User Manual, publication 1764-UM001 A user manual containing information on how to install, use, and
program your MicroLogix 1500 controller.
DeviceNet Adapter User Manual, publication 1769-UM001 A user manual containing information on how to install and use your
1769-ADN DeviceNet adapter.
CompactLogix System User Manual, publication 1769-UM007 A user manual containing information on how to install, use, and
program your 1769-L20 and 1769-L30 CompactLogix controllers.
CompactLogix Controllers User Manual, publication 1769-UM011 A user manual containing information on how to install, use, and
program your 1769-L31, 1769-L32C, 1769-L32E, 1769-L35CR, and
1769-L35E CompactLogix controllers.
Compact I/O Selection Guide, publication 1769-SG002 An overview of 1769 Compact I/O modules.
MicroLogix Programmable Controllers Selection Guide,
publication 1761-SG001 An overview of the MicroLogix 1500 system, including the 1769
Compact I/O system.
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1 In-depth information on grounding and wiring Allen-Bradley
programmable controllers.

9Publication 1769-UM020A-EN-P - December 2009 9
Chapter 1
Overview
Introduction
Module Description
The module converts digital data from controllers to provide analog
output data. The module provides the following output types and
ranges.
The data can be configured as:
•engineering units.
•scaled-for-PID.
•percent range.
•raw/proportional data.
Module configuration is normally done via the controller’s
programming software. In addition, some controllers support
configuration via the user program. In either case, the module
configuration is stored in the memory of the controller. Refer to your
controller’s user manual for more information.
Topic Page
Module Description 9
System Overview 11
Module Operation 11
Normal and Full Ranges
Signal Type Normal Operating Input Range Full Module Range
Voltage
±10V DC ± 10.5V DC
1…5V DC 0.5…5.25V DC
0…5V DC -0.5…5.25V DC
0…10V DC -0.5…10.5V DC
Current 0…20 mA 0…21 mA
4…20 mA 3.2…21 mA

10 Publication 1769-UM020A-EN-P - December 2009
Chapter 1 Overview
Hardware Features
1769-OF4
DANGER
Do Not Remove RTB Under Power
Unless Area is Non-Hazardous
Ensure Adjacent
Bus Lever is Unlatched/Latched
Before/After
Removing/Inserting Module
I out 3 +
I out 0+
I out 2+
ANLG
Com
ANLG
Com
Vout 0 +
Vout 2+
Vout 1+
Vout 3+
I out 1+
OK
Analog
OK
Analog
2a
1
3
10a
10
10b 4
2b
8a
7a
9
7b 8b
7a
5b
6
5a
7b
Item Description
1 Bus lever (with locking function)
2a Upper-panel mounting tab
2b Lower-panel mounting tab
3 Module status indicators
4 Module door with terminal identification label
5a Movable bus connector with female pins
5b Stationary bus connector with male pins
6 Nameplate label
7a Upper tongue-and-groove slots
7b Lower tongue-and-groove slots
8a Upper DIN-rail latch
8b Lower DIN-rail latch
9 Write-on label for user identification tags
10 Removable terminal block (RTB) with finger-safe cover
10a RTB retaining screw
10b RTB retaining screw

Publication 1769-UM020A-EN-P - December 2009 11
Overview Chapter 1
System Overview
The module communicates to the controller through the bus interface.
The module also receives 5 and 24V DC power through the bus
interface.
You can install as many analog modules as your power supply can
support. However, the modules may not be located more than eight
modules away from the system power supply.
Determine Power Supply Distance
Module Operation
When you cycle power, the module performs a check of its internal
circuits, memory, and basic functions. During this time, the
module-status OK indicator remains off. If no faults are found during
power-cycle diagnostics, the module-status OK indicator is turned on.
After power-cycle checks are complete, the module waits for valid
channel-configuration data. If an invalid configuration is detected, the
module generates a configuration error. Once a channel is properly
configured and enabled, the module begins its conversion process.
Each time a new output value is sent to the module, it is tested against
user-configured high and low output clamps for each output channel.
If output values equal to or exceeding either of these clamp levels are
detected, the value sent to the module is clamped at that limit by the
module, and unique bits are set in the output-channel status word.
1
1123432
234
System Power Supply
Compact I/O
Compact I/O
Compact I/O
End Cap
CompactLogixController
or I/O Communication
Adapter
Compact I/O
Compact I/O
Compact I/O
or
Power Supply Distance
Compact I/O
Compact I/O
Compact I/O
Compact I/O
End Cap
MicroLogix 1500 Controller
with Integrated System
Power Supply
Power Supply Distance

12 Publication 1769-UM020A-EN-P - December 2009
Chapter 1 Overview
The channel status words are described in the Input Data File on
page 31.
The controller uses two’s complement binary data when
communicating with the module. This typically occurs at the end of
the program scan or when commanded by the control program. If the
controller and the module determine that the bus data transfer was
made without error, the input data is used in your control program
and the output data is used by the module.
No field calibration is required.

13Publication 1769-UM020A-EN-P - December 2009 13
Chapter 2
Installation and Wiring
Introduction
General Considerations
The Compact I/O system is suitable for use in an industrial
environment when installed in accordance with these instructions.
Specifically, this equipment is intended for use in clean, dry
environments (Pollution degree 2(1)) and to circuits not exceeding
Over Voltage Category II(2) (IEC 60664-1).(3)
Topic Page
General Considerations 13
Assemble the Compact I/O System 16
Mounting the Module 17
Replace a Single Module Within a System 19
Grounding the Module 20
System Wiring Guidelines 21
Label the Terminals 23
Remove the Finger-safe Terminal Block 23
Wire the Finger-safe Terminal Block 24
Wire the Modules 25
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation shall be expected.
(2) Over Voltage 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 product’s insulation.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
designations.

14 Publication 1769-UM020A-EN-P - December 2009
Chapter 2 Installation and Wiring
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, D or nonhazardous locations only. The following attention
statement applies to use in hazardous locations.
Preventing Electrostatic Discharge
ATTENTION EXPLOSION HAZARD
•Substitution of components may impair suitability for Class I,
Division 2.
•Do not replace components or disconnect equipment unless
power has been switched off or the area is known to be
nonhazardous.
•Do not connect or disconnect components unless power has
been switched off or the area is known to be nonhazardous.
•This product must be installed in an enclosure.
•All wiring must comply with N.E.C. article 501-4(b).
ATTENTION Electrostatic discharge can damage integrated circuits or
semiconductors if you touch analog I/O module bus-connector pins
or the terminal block on the module. Follow these guidelines when
you handle the module:
•Touch a grounded object to discharge static potential.
•Wear an approved wrist-strap grounding device.
•Do not touch the bus connector or connector pins.
•Do not touch circuit components inside the module.
•Use a static-safe work station, if available.
•Keep the module in its static-shield box, when it is not in use.

Publication 1769-UM020A-EN-P - December 2009 15
Installation and Wiring Chapter 2
Removing Power
Reduce Noise
Most applications require installation in an industrial enclosure to
reduce the effects of electrical interference. Analog outputs are highly
susceptible to electrical noise. Electrical noise coupled to the analog
outputs reduces the performance (accuracy) of the module.
Group your modules to minimize adverse effects from radiated
electrical noise and heat. Consider the following conditions when
selecting a location for the analog module. Position the module:
•away from sources of electrical noise such as hard-contact
switches, relays, and AC motor drives.
•away from modules that generate significant radiated heat, such
as the 1769-IA16 module. Refer to the module’s heat dissipation
specification.
In addition, route shielded, twisted-pair analog wiring away from any
high-voltage I/O wiring.
Protect the Circuit Board from Contamination
Protect the board from dirt, oil, moisture, and other airborne
contaminants by installing the system in an enclosure suitable for the
environment. Keep the interior of the enclosure clean and the
enclosure door closed whenever possible.
ATTENTION Remove power before removing or inserting this module. When
you remove or insert a module with power applied, an electrical
arc may occur. An electrical arc can cause personal injury or
property damage by:
•sending an erroneous signal to your system’s field devices,
causing unintended machine motion.
•causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the
module and its mating connector and may lead to premature
failure.

16 Publication 1769-UM020A-EN-P - December 2009
Chapter 2 Installation and Wiring
Assemble the Compact I/O
System
The module can be attached to the controller or an adjacent I/O
module before or after mounting.
For mounting instructions, see Panel Mounting By Using the
Dimensional Template on page 18, or Mount to a DIN Rail on page
19. To work with a system that is already mounted, see Replace a
Single Module Within a System on page 19.
1. Disconnect power.
2. Check that the bus lever of the module to be installed is in the
unlocked (fully right) position.
3. Use the upper and lower tongue-and-groove slots (1) to secure
the modules together (or to a controller).
4. Move the module back along the tongue-and-groove slots until
the bus connectors (2) line up with each other.
5. Use your fingers or a small screwdriver to push the bus lever
back slightly to clear the positioning tab (3).
6
5
4
3
1
1
2

Publication 1769-UM020A-EN-P - December 2009 17
Installation and Wiring Chapter 2
6. To allow communication between the controller and module,
move the bus lever fully to the left (4) until it clicks.
Make sure it is locked firmly in place.
7. Attach an end cap terminator (5) to the last module in the
system by using the tongue-and-groove slots as before.
8. Lock the end cap bus terminator (6).
Mounting the Module
Modules may be mounted to a panel or to a DIN rail.
Minimum Spacing
Maintain spacing from enclosure walls, wireways, or adjacent
equipment. Allow 50 mm (2 in.) of space on all sides for adequate
ventilation.
Space Requirements
ATTENTION When attaching I/O modules, it is very important that
the bus connectors are securely locked together to be
sure of proper electrical connection.
IMPORTANT A 1769-ECR or 1769-ECL right or left end cap must be used to
terminate the end of the bus.
ATTENTION During panel or DIN rail mounting of all devices, be sure that all
debris (that is, metal chips or wire strands) is kept from falling
into the module. Debris that falls into the module could cause
damage when you cycle power.
Host Controller
Compact I/O Compact I/O Compact I/O Compact I/O Compact I/O
End Cap
Side Side
Top
Bottom

18 Publication 1769-UM020A-EN-P - December 2009
Chapter 2 Installation and Wiring
Mount to a Panel
Mount the module to a panel by using two screws per module. Use
M4 or #8 panhead screws. Mounting screws are required on every
module.
Panel Mounting By Using the Dimensional Template
Locate holes every 17.5 mm (0.689 in.) to allow for a mix of
single-wide and one-and-a-half-wide modules (for example, the
1769-OA16 module).
Panel Mounting By Using the Modules as a Template
This procedure lets you use the assembled modules as a template for
drilling holes in the panel. If you have sophisticated panel-mounting
equipment, you can use the dimensional template provided. Due to
module mounting-hole tolerance, it is important to follow these
procedures.
1. On a clean work surface, assemble no more than three modules.
2. Using the assembled modules as a template, carefully mark the
center of all module-mounting holes on the panel.
3. Return the assembled modules to the clean work surface,
including any previously mounted modules.
4. Drill and tap the mounting holes for the recommended M4 or #8
screw.
5. Place the modules back on the panel, and check for proper hole
alignment.
132 mm (5.197 in.)
122.6 mm
(4.826 in.)
Host Controller
Refer to host controller documentation for this dimension.
Spacing for single-wide modules 35 mm (1.378 in.).
Overall hole spacing tolerance:
±0.4 mm (0.016 in.).
Spacing for one-and-a-half-wide modules 52.5 mm (2.067 in.).

Publication 1769-UM020A-EN-P - December 2009 19
Installation and Wiring Chapter 2
6. Attach the modules to the panel by using the mounting screws.
7. Repeat steps 1…6for any remaining modules.
Mount to a DIN Rail
The module can be mounted by using the following DIN rails:
•35 x 7.5 mm (EN 50 022 - 35 x 7.5)
•35 x 15 mm (EN 50 022 - 35 x 15)
Before mounting the module on a DIN rail, close the DIN rail latches.
Press the DIN-rail mounting area of the module against the DIN rail.
The latches will momentarily open and lock into place.
Replace a Single Module
Within a System
The module can be replaced while the system is mounted to a panel
(or DIN rail). Follow these steps in order.
1. Remove power.
2. On the module to be removed, remove the upper and lower
mounting screws from the module or open the DIN latches by
using a screwdriver.
3. Move the bus lever to the right to disconnect (unlock) the bus.
TIP If mounting more modules, mount only the last one of this group
and put the others aside. This reduces remounting time during
drilling and tapping of the next group.
ATTENTION Remove power before removing or inserting this module. When
you remove or insert a module with power applied, an electrical
arc may occur. An electrical arc can cause personal injury or
property damage by:
•sending an erroneous signal to your system’s field devices,
causing unintended machine motion.
•causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the
module and its mating connector and may lead to premature
failure.

20 Publication 1769-UM020A-EN-P - December 2009
Chapter 2 Installation and Wiring
4. On the right-side adjacent module, move its bus lever to the
right (unlock) to disconnect it from the module to be removed.
5. Gently slide the disconnected module forward.
If you feel excessive resistance, check that the module has been
disconnected from the bus, and that both mounting screws have
been removed or DIN latches opened.
6. Before installing the replacement module, be sure that the bus
lever on the module to be installed and on the right-side
adjacent module are in the unlocked (fully right) position.
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus
levers on the replacement module and the right-side adjacent
module.
9. Replace the mounting screws or snap the module onto the DIN
rail.
Grounding the Module
This product is intended to be mounted to a well-grounded mounting
surface, such as a metal panel. Additional grounding connections from
the module’s mounting tabs or DIN rail (if used) are not required
unless the mounting surface cannot be grounded. Refer to Industrial
Automation Wiring and Grounding Guidelines, publication 1770-4.1,
for additional information.
TIP It may be necessary to rock the module slightly
from front to back to remove it, or, in a
panel-mounted system, to loosen the screws of
adjacent modules.