Rockwell Automation 1769-OB8 User Manual
Installation Instructions
Compact™ Solid State 24V dc Source,
High Current Output Module
(Catalog Number 1769-OB8, Series A)
Inside
Module Description ................................................................................. 3
Environment and Enclosure ..................................................................... 4
System Assembly..................................................................................... 5
Mounting Compact I/O Modules............................................................. 6
Replacing a Single Module within a System .......................................... 8
Field Wiring Connections ......................................................................... 9
I/O Memory Mapping ............................................................................ 12
1769-OB8 Configuration File.................................................................. 13
Spare/Replacement Module Parts ........................................................ 14
Specifications ........................................................................................ 15
Hazardous Location Considerations ...................................................... 18
Environnements dangereux ................................................................... 18
For More Information............................................................................. 19
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2 Compact™ Solid State 24V dc Source, High Current Output Module
Important User Information
Because of the variety of uses for the products described in this publication, those responsible
for the application and use of these products must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all performance and safety
requirements, including any applicable laws, regulations, codes and standards. In no event
will Rockwell Automation be responsible or liable for indirect or consequential damage
resulting from the use or application of these products.
Any illustrations, charts, sample programs, and layout examples shown in this publication are
intended solely for purposes of example. Since there are many variables and requirements
associated with any particular installation, Rockwell Automation does not assume
responsibility or liability (to include intellectual property liability) for actual use based upon
the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application, Installation and
Maintenance of Solid-State Control (available from your local Rockwell Automation office),
describes some important differences between solid-state equipment and electromechanical
devices that should be taken into consideration when applying products such as those
described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or part, without written
permission of Rockwell Automation, is prohibited.
Throughout this publication, notes may be used to make you aware of safety considerations.
The following annotations and their accompanying statements help you to identify a potential
hazard, avoid a potential hazard, and recognize the consequences of a potential hazard:
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.
!
IMPORTANT
Publication 1769-IN063A-EN-P - March 2003
Identifies information that is critical for successful application and
understanding of the product.
Compact™ Solid State 24V dc Source, High Current Output Module 3
Module Description
1
2a
3
DANGER
Do Not Remo v e R TB Under P o wer
Unless Area is Non-Hazardous
1
C
D
V
10a
10
10b
+
0
T
U
O
U
O
2
T
U
O
U
O
1
M
O
C
C
D
N
C
N
N
C
N
N
C
N
D
V
+
4
T
U
O
U
O
6
T
U
O
U
O
2
M
O
C
C
D
Ensure Adjacent
Bus Leve r is Unlatched/Latched
Before/After
Remo ving/Inser ting Module
6
9-O
17
1
T
3
T
C
C
C
2
C
5
T
7
T
4
8
B
8a
7a
2b
7a
Item Description
1 bus lever
(with locking function)
2a upper panel mounting tab
2b lower panel mounting tab
3 I/O diagnostic LEDs
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
5a
tongue-and-groove slots
8a upper DIN rail latch
5b
9
8b lower DIN rail latch
9 write-on label (user ID tag)
10 removable terminal block (RTB)
with finger-safe cover
6
7b
7b
10a RTB upper retaining screw
10b RTB lower retaining screw
8b
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4 Compact™ Solid State 24V dc Source, High Current Output Module
Environment and Enclosure
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 meters without derating.
This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR Publication 11. Without appropriate precautions,
there may be potential difficulties ensuring electromagnetic compatibility
in other environments due to conducted as well as radiated disturbance.
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
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.
See NEMA Standards publication 250 and IEC publication 60529, as
applicable, for explanations of the degrees of protection provided by
different types of enclosure. Also, see the appropriate sections in this
publication, as well as the Allen-Bradley publication 1770-4.1 (“Industrial
Automation Wiring and Grounding Guidelines”), for additional installation
requirements pertaining to this equipment.
Prevent Electrostatic Discharge
ATTENTION
!
Electrostatic discharge can damage integrated circuits or semiconductors if
you touch bus connector pins. 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.
· If available, use a static-safe work station.
· When not in use, keep the module in its static-shield box.
Publication 1769-IN063A-EN-P - March 2003
Remove Power
Compact™ Solid State 24V dc Source, High Current Output Module 5
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. Worn contacts may create electrical resistance.
System Assembly
The module can be attached to the controller or an adjacent I/O module before or
after mounting. For mounting instructions, see
Rail Mounting" on page 8. To work with a system that is already mounted, see
"Replacing a Single Module within a System" on page 8.
The following procedure shows you how to assemble the Compact I/O system.
2
1
"Panel Mounting" on page 7, or "DIN
3
4
1
6
5
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.
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6 Compact™ Solid State 24V dc Source, High Current Output Module
5. Push the bus lever back slightly to clear the positioning tab (3). Use your
fingers or a small screw driver.
6. To allow communication between the controller and module, move the bus
lever fully to the left (4) until it clicks. Ensure it is locked firmly in place.
ATTENTION
When attaching I/O modules, it is very important that the bus
connectors are securely locked together to ensure proper
electrical connection.
!
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).
IMPORTANT
A 1769-ECR or 1769-ECL right or left end cap must be used to terminate the
end of the serial communication bus.
Mounting Compact I/O Modules
ATTENTION
During panel or DIN rail mounting of all devices, be sure that all debris
(metal chips, wire strands, etc.) is kept from falling into the module. Debris
that falls into the module could cause damage on power up.
!
Minimum Spacing
Maintain spacing from
enclosure walls,
wireways, adjacent
equipment, etc. Allow 50
mm (2 in.) of space on all
sides for adequate
ventilation, as shown:
Publication 1769-IN063A-EN-P - March 2003
Side Side
Host Controller
Top
Compact I/O
Bottom
Compact I/O
Compact I/O
End Cap
Compact I/O
Compact I/O
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