OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9476
32-Channel, 24 V, Sourcing Digital Output Module
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This document describes how to use the National Instruments 9476
and includes specifications and pin assignments for the NI 9476.
Vis it ni.com/info and enter rdsoftwareversion to determine
which software you need for the modules you are using. For
information about installing, configuring, and programming the
system, refer to the system documentation. Visit
and enter
cseriesdoc for information about C Series
ni.com/info
documentation.
Note The safety guidelines and specifications in this
document are specific to the NI 9476. The other
components in the system might not meet the same safety
ratings and specifications. Refer to the documentation for
each component in the system to determine the safety
ratings and specifications for the entire system. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.
NI 9476 Operating Instructions and Specifications 2 ni.com
Safety Guidelines
Operate the NI 9476 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Locations
The NI 9476 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T 4 ha zar dous locations; Class I, Zone 2, AEx nC IIC T4, and
Ex nC IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9476 in a
potentially explosive environment. Not following these guidelines
may result in serious injury or death.
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
© National Instruments Corp. 3 NI 9476 Operating Instructions and Specifications
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection
device between the external power supply and the V
pin. The device must prevent the V
-to-COM voltage
sup
sup
from exceeding 50 V if there is a transient overvoltage
condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9476 in Gas Group IIC hazardous
locations or in ambient temperatures of –40 °C ≤ Ta ≤ 70 °C, you
must use the device in an NI chassis that has been evaluated as
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
NI 9476 Operating Instructions and Specifications 4 ni.com
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, visit
ni.com/certification and search for the LR certificate, or
look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
© National Instruments Corp. 5 NI 9476 Operating Instructions and Specifications
Connecting the NI 9476
The NI 9476 has a 37-pin DSUB connector that provides
connections for 32 digital output channels.
1
DO16
20
DO17
21
DO18
22
DO19
23
DO20
24
DO21
25
DO22
26
DO23
27
Vsup
28
29
Vsup
30
DO24
31
DO25
32
DO26
33
DO27
34
DO28
35
DO29
36
DO30
37
DO31
Figure 1. NI 9476 Pin Assignments
NI 9476 Operating Instructions and Specifications 6 ni.com
DO0
2
DO1
3
DO2
4
DO3
5
DO4
6
DO5
7
DO6
8
DO7
9
Vsup
10
Vsup
11
DO8
12
DO9
13
DO10
14
DO11
15
DO12
16
DO13
17
DO14
18
DO15
19
COM
Each channel has a DO pin to which you can connect a digital input
device. The 32 digital output channels are internally referenced to
COM.
Yo u must connect an external power supply to the NI 9476. The
power supply provides the current for the output channels. Connect
the positive lead of the power supply to the supply pin, V
sup
, and
the negative lead of the power supply to the common pin, COM.
Refer to the Specifications section for information about the power
supply voltage range.
Note The V
pins are internally connected. You can
sup
connect only one external voltage supply to the device.
Caution Do not remove or insert modules if the external
power supply connected to the V
and COM pins is
sup
powered on.
The NI 9476 has current sourcing outputs, meaning the DO pin is
driven to V
© National Instruments Corp. 7 NI 9476 Operating Instructions and Specifications
when the channel is turned on.
sup
Yo u can directly connect the NI 9476 to a variety of industrial
V
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9476 are compatible
with the output specifications of the module. Refer to the
Specifications section for more information about the output
specifications.
Connect the device to DO and COM, and connect the external
power supply to V
NI 9476
NI 9476 Operating Instructions and Specifications 8 ni.com
and COM, as shown in Figure 2.
sup
sup
DO
Device
COM
Figure 2. Connecting a Device to the NI 9476
+
_
External
Powe r
Supply
Increasing Current Drive
Each channel has a continuous output current of 250 mA. If you
want to increase the output current to a device, you can connect
any number of channels together in parallel. For example, if you
want to drive 1 A of current, connect DO<0..3> in parallel as
shown in Figure 3. You must turn all parallel channels on and off
simultaneously so that the current on any single channel cannot
exceed the 250 mA rating.
V
sup
DO0
DO1
250 mA
250 mA
1 A
+
_
External
Powe r
Supply
Device
NI 9476
DO2
DO3
COM
250 mA
250 mA
Figure 3. Increasing the Current to a Device Connected to the NI 9476
© National Instruments Corp. 9 NI 9476 Operating Instructions and Specifications
Protecting the Module from Flyback Voltages
V
If the module is switching an inductive or energy-storing device
such as a solenoid, motor, or relay, and the device does not have
flyback protection, install an external flyback diode as shown in
Figure 4.
sup
External
DO
Flyback
COM
NI 9476
Diode
Inductive
Device
Figure 4. Connecting a Flyback Diode to the NI 9476
NI 9476 Operating Instructions and Specifications 10 ni.com
+
Powe r
_
Supply
I/O Protection
The NI 9476 is protected against overcurrent, inrush, and
short-circuit conditions in accordance with IEC 1131-2.
Understanding Protected Devices
Each channel on the NI 9476 has circuitry that protects it from
voltage and current surges resulting from short circuits.
Caution The NI 9476 can be damaged under overvoltage
and reverse bias voltage conditions. Check the voltage
specifications for all devices that you connect to the
NI 9476.
Excessive current through a DO pin causes the channel to go into
an overcurrent state. In an overcurrent state, the channel cycles off
and on until the short circuit is removed or the current returns to an
acceptably low level. Refer the Specifications section for typical
trip currents.
Each channel has a status line that indicates in software whether the
channel is in an overcurrent state. Refer to the software help for
information about reading output status.
© National Instruments Corp. 11 NI 9476 Operating Instructions and Specifications
Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
NI 9476 Operating Instructions and Specifications 12 ni.com
Specifications
The following specifications are typical for the range – 40 to 70 °C
unless otherwise noted. All voltages are relative to COM unless
otherwise noted.
Output Characteristics
Number of channels.......................... 32 digital output channels
Output type ....................................... Sourcing
Output voltage (V
) ........................... V
0
Power-on output state ....................... Channels off
External power supply
voltage range (V
Continuous output current (I
)........................... 6–36 VDC
sup
) per channel
0
With 6–30 VDC
supply voltage............................. 250 mA max
With 30–36 VDC
supply voltage............................. 200 mA max
Output impedance (R
© National Instruments Corp. 13 NI 9476 Operating Instructions and Specifications
) ..................... 0.3 Ω max
0
– (I0R0)
sup
Continuous overvoltage
protection (V
) ................................ up to 40 V max
sup
Reversed-voltage protection ............. None
Current limiting ................................ None
Short-circuit protection..................... Indefinitely protected when a
channel is shorted to COM or
to a voltage up to V
sup
Trip current for one channel
With all other channels
at rated current............................ 3 A typ
With all other channels off ......... 5 A typ
V
current consumption .................. 28 mA max
sup
Maximum update rate ....................... 40 μs max
Propagation delay .............................500 μs max
NI 9476 Operating Instructions and Specifications 14 ni.com
MTBF ............................................... 1,091,425 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.
Power Requirements
Power consumption from chassis
Active mode ............................... 250 mW max
Sleep mode ................................. 25 μW max
Thermal dissipation (at 70 °C)
Active mode ............................... 1.5 W max
Sleep mode ................................. 30 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight ............................................... 147 g (5.2 oz)
© National Instruments Corp. 15 NI 9476 Operating Instructions and Specifications
Safety
Maximum Voltage
Connect only voltages that are within the following limits.
-to-COM..................................... 36 VDC,
V
sup
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live electrical
supply system that powers equipment. This category is for
measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.
Caution Do not connect the NI 9476 to signals or use
for measurements within Measurement Categories II, III,
or IV.
1
The maximum voltage that can be applied or output between V
creating a safety hazard.
NI 9476 Operating Instructions and Specifications 16 ni.com
1
Measurement Category 1
and COM without
sup
Isolation Voltages
Channel-to-channel........................... No isolation between
Channel-to-earth ground
Continuous ................................. 60 VDC,
Withstand.................................... 1,000 V
channels
Measurement Category I
, verified by a 5 s
rms
dielectric withstand test
Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or visit
by modu le number or product line, and click the
appropriate link in the Certification column.
© National Instruments Corp. 17 NI 9476 Operating Instructions and Specifications
ni.com/certification, search
Hazardous Locations
U.S. (UL) .......................................... Class I, Division 2,
Canada (C-UL) ................................. Class I, Division 2,
Europe (DEMKO)............................. EEx nC IIC T4
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Environmental
National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C
Ingress protection.............................. IP 40
NI 9476 Operating Instructions and Specifications 18 ni.com
Operating humidity
(IEC 60068-2-56).............................. 10 to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56).............................. 5 to 95% RH,
noncondensing
Maximum altitude............................. 2,000 m
Pollution Degree (IEC 60664).......... 2
Shock and Vibration
To meet these specifications, you must panel mount the system.
Operating vibration
Random (IEC 60068-2-64)......... 5 g
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
Operating shock
(IEC 60068-2-27).............................. 30 g, 11 ms half sine,
© National Instruments Corp. 19 NI 9476 Operating Instructions and Specifications
, 10 to 500 Hz
rms
50 g, 3 ms half sine,
18 shocks at 6 orientations
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement,
control, and laboratory use:
• EN 61326 EMC requirements; Industrial Immunity
• EN 55011 Emissions; Group 1, Class A
• CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device with
shielded cabling.
NI 9476 Operating Instructions and Specifications 20 ni.com
CE Compliance
This product meets the essential requirements of applicable
European directives, as amended for CE markings, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
Note Refer to the Declaration of Conformity (DoC) for
this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit
ni.com/certification, search by module number or
product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.
© National Instruments Corp. 21 NI 9476 Operating Instructions and Specifications
For additional environmental information, refer to the NI and the
⬉ᄤֵᙃѻક∵ᶧࠊㅵ⧚ࡲ⊩ ˄Ё
˅
Ёᅶ᠋
Environment Web page at
ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit
environment/weee.htm
.
ni.com/
RoHS
ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ
National InstrumentsЁRoHS
National Instruments
ni.com/environment/rohs_china
about China RoHS compliance, go to
NI 9476 Operating Instructions and Specifications 22 ni.com
environment/rohs_china
ヺড়Ё⬉ᄤֵᙃ
DŽ݇Ѣ
(RoHS)
ড়㾘ᗻֵᙃˈ䇋ⱏᔩ
DŽ
(For information
ni.com/
.)
Where to Go for Support
The National Instruments Web site is your complete resource for
technical support. At
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
branch office:
Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
© National Instruments Corp. 23 NI 9476 Operating Instructions and Specifications
ni.com/support you have access to
ni.com/support
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545
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