OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9472/9474
8-Channel Digital Output Modules
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Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages only to the NI 9472/9474 with
screw terminal. Do not connect hazardous voltages to the NI 9472
with DSUB.
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Make sure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous voltage
LIVE (>42.4 Vpk/60 VDC), you must ensure that devices
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and circuits connected to the module are properly
insulated from human contact. You must use the NI 9932
connector backshell kit to ensure that the terminals are
not accessible.
Figure 1 shows the NI 9932 connector backshell.
Note You can use the NI 9932 connector backshell only
with the NI 9472/9474 with screw terminal.
Figure 1. NI 9932 Connector Backshell
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Safety Guidelines for Hazardous Locations
The NI 9472/9474 is suitable for use in Class I, Division 2,
Groups A, B, C, D, T4 hazardous 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 9472/9474 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.
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.
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Caution For Zone 2 applications, install a protection
device between the Vsup and COM terminals on the
NI 9472/9474. The device must prevent the input
Vsup-to-COM voltage from exceeding 42 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 9472/9474 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.
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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.
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Connecting the NI 9472/9474
The NI 9472/9474 provides connections for eight digital output
channels.
0
4
3
7
0
4
3
7
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
COM
0
1
2
3
4
5
6
7
8
9
1
2
COM
Vsup
COM
COM
Vsup
COM
COM
Vsup
COM
COM
Vsup
COM
COM
DO0
Vsup
DO1
DO2
Vsup
DO3
DO4
Vsup
DO5
DO6
Vsup
DO7
14
15
16
17
18
19
20
21
22
23
24
25
3
4
5
6
7
8
9
10
11
12
13
Figure 2. NI 9472/9474 Terminal and Pin Assignments
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The NI 9472/9474 with screw terminal has a 10-terminal,
detachable screw-terminal connector. The NI 9472 with DSUB has
a 25-pin DSUB connector. Each channel of the NI 9472/9474 has
a terminal or pin, DO, to which you can connect a device. The
eight digital output channels are internally referenced to the
common terminal or pin, COM. National Instruments recommends
you provide independent COM and Vsup wiring for each channel of
the NI 9472 with DSUB to minimize current flow in the COM and
Vsup wiring. The COM pins on the NI 9472 with DSUB are
internally connected..
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9472/9474 with screw terminal.
Each channel has an LED that indicates the state of the channel.
When a channel LED is lit, the channel is on. When the LED is
dark, the channel is off. The LEDs are disabled when the chassis is
in sleep mode. Refer to the Sleep Mode section for more
information about sleep mode.
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You must connect an external power supply to the NI 9472/9474.
This power supply provides the current for the devices you connect
to the module. Connect the positive lead of the power supply to
Vsup and the negative lead of the power supply to COM. The Vsup
pins on the NI 9472 with DSUB are internally connected. You can
connect only one external voltage supply to the device. Refer to the
Specifications section for information about the power supply
voltage range.
Caution Do not remove or insert modules if the external
power supply connected to the Vsup and COM pins is
powered on.
The NI 9472/9474 has current sourcing outputs, meaning the DO
terminal or pin is driven to Vsup when the channel is turned on.
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You can directly connect the NI 9472/9474 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9472/9474 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 connect the common of the device
to COM. Refer to Figure 3 for an illustration of how to connect a
device to the NI 9472/9474.
V
sup
External
Power
Supply
+
_
DO
Device
COM
NI 9472/9474
Figure 3. Connecting a Device to the NI 9472/9474
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Increasing Current Drive
Each channel of the NI 9472 has a continuous output current of
0.75 A, and each channel of the NI 9474 has a continuous output
current of 1 A. If you want to increase the output current to a
device, you can connect any number of channels together in
parallel. For example, using the NI 9474, if you want to drive 4 A
of current, connect DO<0...3> in parallel as shown in Figure 4.
You must turn all parallel channels on and off simultaneously so
that the current on any single channel cannot exceed the 1 A rating.
V
sup
1 A
1 A
DO0
DO1
DO2
DO3
External
Power
Supply
+
_
1 A
1 A
4 A
COM
NI 9474
Figure 4. Increasing the Current to a Device Connected to the NI 9474
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Wiring for High-Vibration Applications
If an application using the NI 9472/9474 with screw terminal is
subject to high vibration, National Instruments recommends that
you either use ferrules to terminate wires to the detachable
screw-terminal connector or use the NI 9932 backshell kit to
protect the connections. Refer to Figure 5 for an illustration of
using ferrules. Refer to Figure 1 for an illustration of the NI 9932
connector backshell.
Figure 5. 10-Terminal Detachable Screw-Terminal Connector with Ferrule
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I/O Protection
The NI 9472/9474 is short-circuit proof in accordance with
IEC 1131-2 and provides overcurrent protection.
Understanding Short-Circuit-Proof Devices
Each channel on the NI 9472/9474 has circuitry that protects it
from current surges resulting from short circuits. Whether the
module suffers damage from these overcurrent conditions depends
on the following factors:
•
•
•
The amount of current through the channel
The amount of time the current is above the current limit
The frequency of the current surges
When the amount of current through the DO terminal or pin is
greater than 13 A, the channel trips and goes into an overcurrent
state. In an overcurrent state, the channel turns off and the module
is not damaged. If the current through DO is between 6 A and 13 A,
the state of the channel is indeterminate and depends on factors
such as the current level, the temperature, and the power supply.
Higher inrush currents that exist for less than the trip time do not
trip the protection circuitry. Refer to the Specifications section for
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more information about the maximum continuous output current,
short-circuit behavior, and short-circuit trip time. You also can
refer to the IEC 1131-2 standard for more information about
short-circuit-proof devices.
Tip Because the NI 9472/9474 module includes internal
flyback diodes, you do not need to add external diodes
when connecting to switching energy storing devices.
Power Supplies and Overcurrent Conditions
If a short-circuit occurs, the current through DO can exceed the
current rating for the power supply and the maximum continuous
output current for the NI 9472/9474.
If the power supply you are using with the NI 9472/9474 cannot
supply more than 13 A, the module may be damaged if a
short-circuit condition occurs.
Detecting an Overcurrent Condition
If a device connected to the module is not working while the
channel is on, the module channel may be in an overcurrent state.
Neither the software nor the module LEDs indicate if an
overcurrent condition occurs. A channel LED may be on even if the
channel is off because of an overcurrent condition. To determine if
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the channel is in an overcurrent state, measure the voltage between
DO and Vsup. If the voltage is equal to the voltage of the external
power supply connected to the module, the channel is in an
overcurrent state.
Resetting Channels After an Overcurrent Condition
After you have determined and fixed the cause of the overcurrent
condition, reset the channel by turning it off. Alternatively, you can
disconnect the external power supply from the module. However,
doing so disconnects power from all of the module channels.
Normal operation can resume after you correct the overcurrent
condition and reset the channel.
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.
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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.
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. The specifications are the same for the NI 9472
and the NI 9474 unless otherwise noted.
Output Characteristics
Number of channels..........................8 digital output channels
Output type .......................................Sourcing
Power-on output state .......................Channels off
External power supply voltage range (Vsup
)
NI 9472.......................................6–30 VDC
NI 9474.......................................5–30 VDC
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Output impedance (R0)
Typical........................................0.07 Ω
Maximum ...................................0.13 Ω
Continuous output current (I0), per channel
NI 9472.......................................0.75 A max
NI 9474.......................................1 A max
Output voltage (V0)...........................Vsup – (I0 · R0)
I/O protection
Voltage........................................30 VDC max
Reversed voltage ........................None
Short-circuit behavior
Current
0 to 1 A
1 to 6 A
6 to 13 A
>13 A
Channel Behavior
Channel does not trip
Channel does not trip
Channel may trip
Channel trips
Module Protection
Module is not damaged
Module may be damaged
Module may be damaged
Module is not damaged
Short-circuit trip time.................10 μs at 13 A
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Output delay time (full load)
NI 9472.......................................100 μs max
NI 9474.......................................1 μs max
MTBF
NI 9472.......................................1,113,301 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
NI 9474.......................................479,889 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.
NI 9472 Power Requirements
Power consumption from chassis
Active mode ...............................230 mW max
Sleep mode .................................0.4 mW max
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Thermal dissipation (at 70 °C)
Active mode ...............................1.5 W max
Sleep mode .................................55 mW max
NI 9474 Power Requirements
Power consumption from chassis
Active mode ...............................660 mW max
Sleep mode .................................0.6 mW max
Thermal dissipation (at 70 °C)
Active mode ...............................1.5 W max
Sleep mode .................................0.6 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Screw-terminal wiring ......................12 to 24 AWG copper
conductor wire with 10 mm
(0.39 in.) of insulation
stripped from the end
Torque for screw terminals ...............0.5 to 0.6 N · m
(4.4 to 5.3 lb · in.)
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Ferrules .............................................0.25 mm2 to 2.5 mm2
Weight
NI 9472/9474 with
screw terminal ............................150 g (5.3 oz)
NI 9472 with DSUB...................145 g (5.1 oz)
Safety
NI 9472/9474 with Screw Terminal Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM..............................30 VDC max
Isolation
Channel-to-channel ....................None
Channel-to-earth ground
Continuous...........................250 Vrms
,
Measurement Category II
Withstand .............................2,300 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
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This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for U.S.
or 230 V for Europe.
Caution Do not connect the NI 9472/9474 with screw
terminal to signals or use for measurements within
Measurement Categories III or IV.
NI 9472 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM..............................30 VDC max
Isolation
Channel-to-channel ....................None
Channel-to-earth ground
Continuous...........................60 VDC,
Measurement Category I
Withstand .............................1,000 Vrms, verified by a 5 s
dielectric withstand test
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
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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 9472 with DSUB to
signals or use for measurements within Measurement
Categories II, III, or IV.
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 ni.com/certification, search
by module number or product line, and click the
appropriate link in the Certification column.
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Hazardous Locations
U.S. (UL) ..........................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Europe (DEMKO).............................EEx nC IIC T4
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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
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
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Shock and Vibration
To meet these specifications, you must panel mount the system.
If you are using the NI 9472/9474 with screw terminal, you also
must either affix ferrules to the ends of the terminal wires or use the
NI 9932 backshell kit to protect the connections.
Operating vibration
Random (IEC 60068-2-64).........5 grms, 10 to 500 Hz
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
Operating shock
(IEC 60068-2-27)..............................30 g, 11 ms half sine,
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
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Note For EMC compliance, operate this device with
shielded cabling.
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.
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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.
For additional environmental information, refer to the NI and the
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 ni.com/
environment/weee.htm.
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ni.com/environment/rohs_chinaDŽ
about China RoHS compliance, go to
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Where to Go for Support
The National Instruments Web site is your complete resource for
technical support. At ni.com/support you have access to
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 ni.com/support
and follow the calling instructions or dial 512 795 8248. For
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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,
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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Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other
product and company names mentioned herein are trademarks or trade names of their respective companies.
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,
the patents.txt file on your media, or ni.com/patents.
© 2003–2008 National Instruments Corp. All rights reserved.
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