OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9475
8-Channel, 60 V, High-Speed, Sourcing Digital Output
Module
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Safety Guidelines
Operate the NI 9475 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 9475 is suitable for use in Class I, Division 2, Groups A, B,
C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and
Ex nA IIC T4 hazardous locations; and nonhazardous locations
only. Follow these guidelines if you are installing the NI 9475 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.
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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 input signal and the NI 9475 input
pin. The device must prevent the input Vsup-to-COM
voltage from exceeding 84 V if there is a transient
overvoltage condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate No. 07 ATEX 0626664X. Each module
is marked
II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9475 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 9475
The NI 9475 has a 25-pin DSUB connector that provides
connections for eight digital output channels.
0
4
3
7
1
2
3
4
5
6
7
8
9
10
11
12
13
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
Figure 1. NI 9475 Pin Assignments
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Each channel of the NI 9475 has a DO pin to which you can
connect a device. Each channel also has a COM pin and a Vsup pin.
National Instruments recommends you provide independent COM
and Vsup wiring for each channel to minimize current flow in the
COM and Vsup wiring. The COM pins are all connected together
internally.
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.
You must connect an external power supply to the NI 9475. 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. 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 9475 has current sourcing outputs, meaning the DO pin is
driven to Vsup when the channel is turned on.
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You can directly connect the NI 9475 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect to the NI 9475 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 2 for an illustration of how to connect a
device to the NI 9475.
V
sup
External
Power
Supply
+
–
DO
Device
COM
NI 9475
Figure 2. Connecting a Device to the NI 9475
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Increasing Current Drive
Each channel 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, if you want
to drive 4 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 1 A rating.
V
sup
1 A
1 A
DO0
DO1
DO2
DO3
External
Power
Supply
+
_
1 A
1 A
4 A
COM
NI 9475
Figure 3. Increasing the Current to a Device Connected to the NI 9475
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I/O Protection
The NI 9475 is short-circuit proof in accordance with IEC 1131-2
and provides overcurrent protection.
Understanding Short-Circuit-Proof Devices
Each channel on the NI 9475 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 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.
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Higher inrush currents that exist for less than the trip time do not
trip the protection circuitry. Refer to the Specifications section for
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 9475 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 9475.
If the power supply you are using with the NI 9475 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
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overcurrent condition occurs. A channel LED may be on even if the
channel is off because of an overcurrent condition. To determine if
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. For more information
about writing to output channels, refer to the software help. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation. 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
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support for 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.
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..........................8 digital output channels
Output type .......................................Sourcing
Power-on output state .......................Channels off
External power supply
voltage range (Vsup)...........................0–60 VDC
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Output impedance (R0) .....................0.14 Ω max
Continuous output current (I0),
per channel........................................1 A max
Output voltage ..................................Vsup – (I0 · R0)
I/O protection
Voltage........................................60 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
Output delay time (full load) ............1 μs max
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MTBF ...............................................1,096,296 hours at 25 °C;
Bellcore Issue 6, 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 ...............................355 mW max
Sleep mode .................................25 μW max
Thermal dissipation (at 70 °C)
Active mode ...............................1.5 W max
Sleep mode .................................25 μW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Weight...............................................142 g (4.9 oz)
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Safety
Maximum Voltage1
Connect only voltages that are within the following limits.
Vsup-to-COM.....................................60 VDC,
Measurement Category I
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 9475 to signals or use for
measurements within Measurement Categories II, III,
or IV.
1 The maximum voltage that can be applied or output between Vsup and COM without
creating a safety hazard.
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Isolation Voltages
Channel-to-channel...........................No isolation between
channels
Channel-to-earth ground
Continuous .................................60 VDC,
Measurement Category I
Withstand....................................1,000 Vrms, verified by a 5 s
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 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 nA IIC T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nA IIC T4
Europe (DEMKO).............................Ex nA 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
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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 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
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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.
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)
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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.
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.
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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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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
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,
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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
National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the
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 CD, or ni.com/patents.
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