Allen-Bradley 1769-OF8C User manual

Publication 1769-IN065B-EN-P - September 2005
Installation Instructions
Compact 1769-OF8C Analog Output Module
Inside
Module Description ..................................................................................2
Module Installation...................................................................................3
System Assembly......................................................................................4
Mounting Expansion I/O ...........................................................................5
Replacing a Single Module within a System ...........................................7
Module Spare/Replacement Parts ...........................................................8
Field Wiring Connections..........................................................................8
I/O Memory Mapping .............................................................................12
Specifications .........................................................................................23
Hazardous Location Considerations .......................................................26
Environnements dangereux ....................................................................27
For More Information..............................................................................28

2Compact 1769-OF8C Analog Output Module
Publication 1769-IN065B-EN-P - September 2005
Module Description
Item Description
1bus lever
(with locking function)
2a upper panel mounting tab
2b lower panel mounting tab
3module status LED
4module door with terminal
identification label
5a movable bus connector
with female pins
5b stationary bus connector
with male pins
6nameplate label
7a upper
tongue-and-groove slots
7b lower
tongue-and-groove slots
8a upper DIN rail latch
8b lower DIN rail latch
9write-on label (user ID tag)
10 removable terminal block (RTB)
with finger-safe cover
10a RTB upper retaining screw
10b RTB lower retaining screw
10a
10b 4
10
2b
3
2a
1
5
a
95
b
6
7a
7b
8b
7b
8a
7a
1769-OF8C
DANGER
Do Not Remove RTB Under Power
Unless Area is Non-Hazardous
Ensure Adjacent
Bus Lever is Unlatched/Latched
Before/After
Removing/Inserting Module
dc
NEUT
I out 2 +
I out 3 +
I out 4 +
I out 5 +
I out 6 +
I out 7 +
+24V dc
I out 1 +
I out 0 +
ANGL
Com
ANLG
Com
ANLG
Com
ANLG
Com
ANLG
Com
ANLG
Com
ANLG
Com
ANLG
Com
OK
Analog
OK
Analog

Compact 1769-OF8C Analog Output Module 3
Publication 1769-IN065B-EN-P - September 2005
Module Installation
Compact I/O 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)
Prevent Electrostatic Discharge
Remove Power
(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.
ATTENTION Electrostatic discharge can damage integrated circuits or
semiconductors if you touch bus connector pins or the terminal
block. 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.
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.

4Compact 1769-OF8C Analog Output Module
Publication 1769-IN065B-EN-P - September 2005
System Assembly
The module can be attached to the controller or an adjacent I/O module before or
after mounting. For mounting instructions, see “Panel Mounting” on page 6, or
“DIN Rail Mounting” on page 7. To work with a system that is already mounted, see
“Replacing a Single Module within a System” on page 7.
The following procedure shows you how to assemble the Compact I/O system.
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. Push the bus lever back slightly to clear the positioning tab (3). Use your
fingers or a small screwdriver.
6
5
4
3
1
1
2

Compact 1769-OF8C Analog Output Module 5
Publication 1769-IN065B-EN-P - September 2005
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.
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 Expansion I/O
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:
ATTENTION When attaching I/O modules, it is very important that the bus
connectors are securely locked together to ensure proper
electrical connection.
IMPORTANT A 1769-ECR or 1769-ECL right or left end cap must be used to
terminate the end of the serial communication bus.
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.
Top
Bottom
Side Side
Host Controller
Compact I/O Compact I/O Compact I/O Compact I/O Compact I/O
End Cap

6Compact 1769-OF8C Analog Output Module
Publication 1769-IN065B-EN-P - September 2005
Panel Mounting
Mount the module to a panel using two screws per module. Use M4 or #8 panhead
screws. Mounting screws are required on every module.
Panel Mounting Using the Dimensional Template
Panel Mounting Procedure Using Modules as a Template
The following procedure allows you to 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 on page 6. 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.
6. Attach the modules to the panel using the mounting screws.
7. Repeat steps 1 to 6 for any remaining modules.
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.
Host Controller
Compact I/O Compact I/O Compact I/O
End Cap
132 (5.197)
122.6±0.2
(4.826±0.008)
35
(1.38)
28.5
(1.12)
Refer to host controller documentation for this dimension.
For more than 2 modules: (number of modules-1) X 35mm (1.38 in.)
NOTE: All dimensions are in mm (inches).
Hole spacing tolerance: ±0.4 mm (0.016 in.)

Compact 1769-OF8C Analog Output Module 7
Publication 1769-IN065B-EN-P - September 2005
DIN Rail Mounting
The module can be mounted using the following DIN rails: 35 x 7.5 mm (EN 50 022
- 35 x 7.5) or 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.
Replacing a Single Module within a System
The module can be replaced while the system is mounted to a panel (or DIN rail).
Follow the steps below in order:
1. Remove power. See important note on page 3.
2. On the module to be removed, remove the upper and lower mounting
screws from the module (or open the DIN latches using a flat-blade or
phillips-style screwdriver).
3. Move the bus lever to the right to disconnect (unlock) the bus.
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).
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.

8Compact 1769-OF8C Analog Output Module
Publication 1769-IN065B-EN-P - September 2005
Module Spare/Replacement Parts
•Terminal block, catalog number 1769-RTBN12 (1 per kit)
(A-B part number A22112-319-01)
•Door, catalog number 1769-RD (2 per kit)
Field Wiring Connections
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,
Allen-Bradley publication 1770-4.1, for additional information.
System Wiring Guidelines
Consider the following when wiring your system:
•All module commons (ANLG COM) are connected in the analog module.
The analog common (ANLG COM) is not connected to earth ground inside
the module.
•Channels are not isolated from each other.
•Use Belden 8761, or equivalent, shielded wire.
•Under normal conditions, the drain wire and shield junction must be
connected to earth ground, via a panel or DIN rail mounting screw at the
analog I/O module end. Keep the shield connection to ground as short as
possible.(1)
•To ensure optimum accuracy, limit overall cable impedance by keeping your
cable as short as possible. Locate the I/O system as close to your sensors or
actuators as your application will permit.
•Current outputs (Iout 0+ to Iout 7+) of the 1769-OF8C module source
current that returns to ANLG COM. Load resistance for a current output
channel must remain between 0 and 500 Ω.
(1) In environments where high frequency noise may be present, it may be necessary to ground the shield via a 0.1µF capacitor
at the load end and also ground the module end without a capacitor.

Compact 1769-OF8C Analog Output Module 9
Publication 1769-IN065B-EN-P - September 2005
External Power Switch
The 1769-OF8C has an external 24V dc power switch which gives you the option of
using an external power supply. The switch is located in on the lower left portion
of the module’s circuit board, as shown below. With this switch pressed on the top
(default), 24V dc power is drawn from the 1769 system power supply via the 1769
I/O bus. Pressed on the bottom, 24V dc power is drawn from the external power
supply.
Wire the external power supply to the module via the module’s terminal block. The
external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V
dc and 160 mA minimum.
BUS EXT
External Power Switch
Pressed on the Top
Bus Power (default)
Pressed on the Bottom
External Power

10 Compact 1769-OF8C Analog Output Module
Publication 1769-IN065B-EN-P - September 2005
Wiring Output Devices
Basic wiring of output devices is shown below.
Labeling the Terminals
A removable, write-on label is provided with the module. Remove the label from
the door, mark the identification of each terminal with permanent ink, and slide the
label back into the door. Your markings (ID tag) will be visible when the module
door is closed.
ATTENTION •Miswiring of the module to an AC/DC source will damage the
module.
•Be careful when stripping wires. Wire fragments that fall into
a module could cause damage at power up. Once wiring is
complete, ensure the module is free of all metal fragments.
ANLG Com
ANLG Com
ANLG Com
ANLG Com
ANLG Com
ANLG Com
ANLG Com
ANLG Com
dc NEUT
+24V dc
I out 7+
I out 6+
I out 5+
I out 4+
I out 3+
I out 2+
I out 1+
I out 0+
+
-
Current Load
earth ground
External 24V dc Power
Supply (optional)