Allen-Bradley Compact 1769-OB32 User manual

Publication 1769-IN031A-EN-P - April 2003
Installation Instructions
Compact 32-point Solid-state 24V dc Source
Output Module
Catalog Number 1769-OB32
Use this document as a guide when installing a Compact™ 32-point solid-state 24V dc
source output module.
Topic Page
Important User Information 2
Module Description 3
Module Installation 4
System Assembly 5
Mounting Expansion I/O 6
Replacing a Single Module within a System 8
Field Wiring Connections 9
I/O Memory Mapping 12
1769-OB32 Configuration File 13
Spare/Replacement Module Parts 15
Specifications 16
Hazardous Location Considerations 21
For More Information 22

2Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
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.
ATTENTIO
N
!
Identifies information about practices or circumstances that can 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.

Compact 32-point Solid-state 24V dc Source Output Module 3
Publication 1769-IN031A-EN-P - April 2003
Module Description
Item Description
1bus lever
(with locking function)
2a upper panel mounting tab
2b lower panel mounting tab
3I/O diagnostic LEDs
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
3
2a
1
2b
5a
9
7a
7b
8b
7b
8a
7a
5b
6
1769-OB32
WARNING -Do Not
Remove RTB Unless
Area is Non-Hazardous
30537-M
DC
COM 1
OUT 14
OUT 12
OUT 10
OUT 8
OUT 6
OUT 4
OUT 2
OUT 0
OUT 15
OUT 13
OUT 11
OUT 9
OUT 7
OUT 5
OUT 3
OUT 1
+VDC 1
DC
COM 2
OUT 30
OUT 28
OUT 26
OUT 24
OUT 22
OUT 20
OUT 18
OUT 16
OUT 31
OUT 29
OUT 27
OUT 25
OUT 23
OUT 21
OUT 19
OUT 17
+VDC 2

4Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
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. 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.

Compact 32-point Solid-state 24V dc Source Output Module 5
Publication 1769-IN031A-EN-P - April 2003
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 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.
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 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.
1
1
2
6
5
4
3
30536-M

6Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
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:
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.
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.
Controller
Compact I/O Compact I/O Compact I/O Compact I/O Compact I/O
End Cap
Top
Bottom
Side Side

Compact 32-point Solid-state 24V dc Source Output Module 7
Publication 1769-IN031A-EN-P - April 2003
Panel Mounting 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 (e.g. 1769-OA16).
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 7. 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
Spacing for single-wide modules 35 mm (1.378 in.)
Refer to host controller documentation for this dimension.
Note: Overall hole spacing
tolerance: ±0.4 mm (0.016 in.).
Spacing for one-and-a half-wide modules 52.5 mm (2.067 in.)

8Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
DIN Rail Mounting
The module can be mounted using these 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).
1. Remove power. See important note on page 4.
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 screw driver).
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.

Compact 32-point Solid-state 24V dc Source Output Module 9
Publication 1769-IN031A-EN-P - April 2003
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.
Output Wiring
Basic wiring(1) of output devices(2) to the 1769-OB32 is shown below.
ATTENTION
!
•Miswiring of the module to an AC power source or
applying reverse polarity 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.
(1) Recommended Surge Suppression - Use a 1N4004 diode reverse-wired across the load for transistor outputs switching 24V
dc inductive loads. For additional details, refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley
publication 1770-4.1.
(2) Sourcing Output - Source describes the current flow between the I/O module and the field device. Sourcing output circuits
supply (source) current to sinking field devices. Field devices connected to the negative side (DC Common) of the field
power supply are sinking field devices. Field devices connected to the positive side (+V) of the field supply are sourcing field
devices. Europe: DC sinking input and sourcing output module circuits are the commonly used options.
+DC
24Vdc
-DC
DC
COM 1
DC
COM 2
OUT 14
OUT 12
OUT 10
OUT 8
OUT 6
OUT 4
OUT 2
OUT 0
OUT 15
OUT 13
OUT 11
OUT 9
OUT 7
OUT 5
OUT 3
OUT 1
+VDC 1
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
+DC
24Vdc
-DC
OUT 30
OUT 28
OUT 26
OUT 24
OUT 22
OUT 20
OUT 18
OUT 16
OUT 31
OUT 29
OUT 27
OUT 25
OUT 23
OUT 21
OUT 19
OUT 17
+VDC 2
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
30527-M
1769-OB32

10 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
A removable write-on label is included 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.
Removing the Finger-safe Terminal Block
When wiring field devices to the module, it is not necessary to remove the terminal
block. If you remove the terminal block, use the write-on label on the side of the
terminal block to identify the module slot lcation and type. RTB position can be
indicated by circling either the ‘R’ for right side or ‘L’ for left side.
To remove the terminal block, loosen the upper and lower retaining screws. The
terminal block will back away from the module as you remove the screws. When
replacing the terminal block, torque the retaining screws to 0.46 Nm (4.1 in-lbs).
Wiring the Finger-safe Terminal Block
When wiring the terminal block, keep the finger-safe cover in place.
1. Loosen the terminal screws to be wired.
R SLOT# L
MODULE TYPE
30517-M
wiring the
finger-safe terminal
block
upper retaining screw
lower retaining screw

Compact 32-point Solid-state 24V dc Source Output Module 11
Publication 1769-IN031A-EN-P - April 2003
2. Route the wire under the terminal pressure plate. You can use the bare wire
or a spade lug. The terminals will accept a 6.35 mm (0.25 in.) spade lug.
3. Tighten the terminal screw making sure the pressure plate secures the wire.
Recommended torque when tightening terminal screws is 0.68 Nm (6 in-lbs).
Simplified Output Circuit Diagram
TIP The terminal screws are non-captive. Therefore, it is
possible to use a ring lug [maximum 1/4 inch o.d. with
a 0.139 inch minimum i.d. (M3.5)} with the module.
TIP If you need to remove the finger-safe cover, insert a
screw driver into one of the square, wiring holes and
gently pry the cover off. If you wire the terminal block
with the finger-safe cover removed, you will not be
able to put it back on the terminal block because the
wires will be in the way.
VCC
User SideLogic Side
ASIC
VDC
OUT
COM
TR1
G
S
D

12 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
Wire Size and Terminal Screw Torque
Each terminal accepts as many as two wires with these restrictions:
I/O Memory Mapping
Output Data File
For each module, slot x, word 0 in the output data file contains the control
program’s directed state of the discrete output points.
w = write
Output Module’s Input Data File
For each module, slot x, input data file word 0 contains the state of the module’s
output data (output data echo) file word 0. During normal operation, these input
bits represent the logic state that the outputs are directed to by the control program.
They are also dependent upon the:
•Program Mode configuration (if supported by the controller)
•The Fault Mode configuration (if supported by the controller)
r = read
Wire Type Wire Size Terminal Screw
Torque
Retaining Screw
Torque
Solid Cu-90°C (194°F) #14 to #22 AWG 0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)
Stranded Cu-90°C (194°F) #16 to #22 AWG 0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)
Word
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0wwwwwwwwwwwwwwww
1wwwwwwwwwwwwwwww
Word
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 r r r r r r r r r r r r r r r r
1 r r r r r r r r r r r r r r r r

Compact 32-point Solid-state 24V dc Source Output Module 13
Publication 1769-IN031A-EN-P - April 2003
1769-OB32 Configuration File
The read/writable configuration data file allows the setup of the hold last state and
user-defined safe state conditions.
The manipulation of the bits from this file is normally done with programming
software (e.g., RSLogix 500, RSNetWorx for DeviceNet, etc.) during initial
configuration of the system. In that case, graphical screens are provided via the
programmer to simplify configuration. However, some systems (e.g., 1769-ADN
DeviceNet Adapter) also allow the bits to be altered as part of the control program
using communication rungs. In that case, it is necessary to understand the bit
arrangement.
IMPORTANT The output module’s input data file reflects the output data echo
of the module, not necessarily the electrical state of the output
terminals. It does not reflect shorted or open outputs.
It is important to use this input word if the controller adapter
supports the Program Mode or Fault Mode function, and if it is
configured to use them.
Word
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0000000000000000PFE
10000000000000000
2Program State for Output Array Word 0
3Program State for Output Array Word 1
4Program Value for Output Array Word 0
5Program Value for Output Array Word 1
6Fault State for Output Array Word 0
7Fault State for Output Array Word 1
8Fault Value for Output Array Word 0
9Fault Value for Output Array Word 1
10 0000000000000000
11 0000000000000000
12 0000000000000000
13 0000000000000000
14 0000000000000000
15 0000000000000000

14 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
Program State Word
Word 1, the program state word, selects the hold
last state or user-defined safe state condition for
each individual output on a system transition
from Run to Program.
Program Value Word
The program value word, word 2, is used to
program the user-defined safe state value (0=Off,
1=On). Each output is individually configurable
for on or off.
Fault State Word
Word 3, the fault state word, selects the hold last
state or user-defined safe state condition for each
individual output on a system transition from Run
to Fault.
Fault Value Word
The fault value word, word 4, is used to program
the fault state value (0=Off, 1=On). Each output
is individually configurable for on or off.
Program to Fault Enable Bit (PFE)
Word 0, bit 0, allows the selection of which data
value, the program or fault value, to apply to the
output if a system in Program mode undergoes a
system fault, resulting a change to Fault mode.
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
Value Bit Setting
Off 0
On 1
Condition Bit Setting
User-defined Safe State 0
Hold Last State 1
Value Bit Setting
Off 0
On 1
Value Applied Bit Setting
Program 0
Fault 1

Compact 32-point Solid-state 24V dc Source Output Module 15
Publication 1769-IN031A-EN-P - April 2003
Module Default Condition
The modules default condition is all zeros, programming the conditions shown.
Spare/Replacement Module Parts
•Terminal Block: 1769-RTBN18 (1 per kit)
Word or Bit Affected Condition Applied
Word 0, Bit 0: Program-to-Fault Enable Program Value
Word 1: Program State User-defined Safe State
Word 2: Program Value Off
Word 3: Fault State User-defined Safe State
Word 4: Fault Value Off

16 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
Specifications
General Specifications
Specification Value
Dimensions 118 mm (height) x 87 mm (depth) x 52.5 mm (width)
height including mounting tabs is 138 mm
4.65 in. (height) x 3.43 in (depth) x 2.07 in (width)
height including mounting tabs is 5.43 in.
Approximate Shipping Weight
(with carton)
450g (0.992 lbs.)
Storage Temperature -40°C to +85°C (-40°F to +185°F)
Operating Temperature 0°C to +60°C (32°F to +140°F)
Operating Humidity 5% to 95% non-condensing
Operating Altitude 2000 meters (6561 feet)
Vibration Operating: 10 to 500 Hz, 5G, 0.030 inches maximum
peak-to-peak
Relay Operation: 2G
Shock Operating: 30G panel mounted (20G DIN rail mounted)
Relay Operation: 7.5G panel mounted (5G DIN rail mounted)
Non-Operating: 40G panel mounted (30G DIN rail mounted)
Agency Certification •C-UL certified (under CSA C22.2 No. 142)
•UL 508 listed
•CE and C-Tick compliant for all applicable directives
Hazardous Environment Class Class I, Division 2, Hazardous Location, Groups A, B, C, D (UL
1604, C-UL under CSA C22.2 No. 213)
Radiated and Conducted Emissions EN50081-2 Class A
Electrical /EMC: The module has passed testing at the following levels:
ESD Immunity (IEC61000-4-2) •4kV contact, 8 kV air, 4 kV indirect
Radiated Immunity (IEC61000-4-3) •10 V/m, 80 to 1000 MHz, 80% amplitude modulation,
+900 MHz keyed carrier
Fast Transient Burst (IEC61000-4-4) •2 kV, 5 kHz
Surge Immunity (IEC61000-4-5) •2 kV common mode, 1 kV differential mode
Conducted Immunity (IEC61000-4-6) •10V, 0.15 to 80 MHz(1)
(1) Conducted Immunity frequency range may be 150 kHz to 30 MHz if the Radiated Immunity frequency range is 30 MHz to
1000 MHz.

Compact 32-point Solid-state 24V dc Source Output Module 17
Publication 1769-IN031A-EN-P - April 2003
Output Specifications
Specification 1769-OB32
Voltage Category 24V dc
Operating Voltage Range 20.4V dc to 26.4V dc (source(1))
(1) Sourcing Output - Source describes the current flow between the I/O module and the field device. Sourcing output circuits
supply (source) current to sinking field devices. Field devices connected to the negative side (DC Common) of the field power
supply are sinking field devices. Field devices connected to the positive side (+V) of the field supply are sourcing field
devices. Europe: DC sinking input and sourcing output module circuits are the commonly used options.
Number of Outputs 32
Bus Current Draw (max.) 300 mA at 5V dc (1.5W)
Heat Dissipation 4.5 Total Watts (The Watts per point, plus the minimum Watts,
with all points energized.)
Signal Delay (max.) – resistive load turn-on = 0.1 ms
turn-off = 1.0 ms
Off-State Leakage (max.)(2)
(2) Typical Loading Resistor - To limit the effects of leakage current through solid state outputs, a loading resistor can be
connected in parallel with your load. Use a 5.6K ohm, ½ watt resistor for transistor outputs, 24V dc operation.
1.0 mA at 26.4V dc
On-State Current (min.) 1.0 mA
On-State Voltage Drop (max.) 1.0V dc at 1.0 A
Continuous Current Per Point (max.)
See the derating graphs on page 18.
0.5A at 60°C (140°F)
1.0A at 30°C (86°F)
Continuous Current Per Common (max.)
See the derating graphs on page 18.
4.0A at 60°C (140°F)
8.0A at 30°C (86°F)
Continuous Current Per Module (max.)
See the derating graphs on page 18.
8.0A at 60°C (140°F)
16.0A at 30°C (86°F)
Surge Current (max.)(3)
(3) Recommended Surge Suppression - Use a 1N4004 diode reverse-wired across the load for transistor outputs switching 24V
dc inductive loads. For additional details, refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley
publication 1770-4.1.
2.0A (Repeatability is once every 2 seconds for a duration of 10
msec.)
Power Supply Distance Rating 6 (The module may not be more than 6 modules away from the
power supply.)
Output Point to Bus Isolation Verified by one of the following dielectric tests: 1200V ac for 1
sec. or 1697V dc for 1 sec.
75V dc working voltage (IEC Class 2 reinforced insulation)
Isolated Groups Group 1: outputs 0 to 15 (internally connected to DC COM 1)
Group 2: outputs 16 to 31 (internally connected to DC COM 2)
Vendor I.D. Code 1
Product Type Code 7
Product Code 73

18 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
Temperature Derating
The area within the curve represents the safe operating range for the module under
various conditions of user supplied voltages and ambient temperatures.
4.00
4.50
5.00
5.50
6.00
6.50
7.00
7.50
8.00
30˚C (86˚F) 40˚C (104˚F) 50˚C (122˚F) 60˚C (140˚F)
30533-M
Ambient Termperature
Maximum Amperes Per Common
1769-OB32 Maximum Amperes per Common vs. Temperature
Temperature Derating
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
30˚C (86˚F) 40˚C (104˚F) 50˚C (122˚F) 60˚C (140˚F)
30534-M
Ambient Termperature
Maximum Amperes Per Module
1769-OB32 Maximum Amperes per Module vs. Temperature
Temperature Derating

Compact 32-point Solid-state 24V dc Source Output Module 19
Publication 1769-IN031A-EN-P - April 2003
Transistor Output Transient Pulses
The maximum duration of the transient pulse occurs when minimum load is
connected to the output. However, for most applications, the energy of the
transient pulse is not sufficient to energize the load.
ATTENTION
!
A transient pulse occurs in transistor outputs when the external
DC supply voltage is applied to the output common terminals
(e.g. via the master control relay). The sudden application of
voltage creates this transient pulse. This condition is inherent in
transistor outputs and is common to solid state devices. A
transient pulse can occur regardless of the controller having
power or not. Refer to your controller’s user manual to reduce
inadvertent operation.
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
30˚C
Ambient Termperature
Maximum Amperes Per Point
(86˚F) 40˚C
1769-OB32 Maximum Amperes per Point vs. Temperature
Temperature Derating
(104˚F) 50˚C (122˚F) 60˚C (140˚F)
30526-M

20 Compact 32-point Solid-state 24V dc Source Output Module
Publication 1769-IN031A-EN-P - April 2003
The graph below illustrates that the duration of the transient is proportional to the
load current. Therefore, as the on-state load current increases, the transient pulse
decreases. Power-up transients do not exceed the time duration shown below, for
the amount of loading indicated, at 60°C (140°F).
0.4
1.0
0.9
0.8
0.7
0.6
0.5
0.3
0.2
0.1
0.0 10009008007006005004003002001001
30519-M
On-State Load Current (mA)
Transient Pluse Duration as a Function of Load Current
Time-Duration of transient (mS)