National Instruments NI 9476 User manual

NI-9476 Getting
Started
2022-07-06

Contents
Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
NI-9476 with Spring Terminal Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
NI-9476 with DSUB Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
NI-9476 Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting a Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting an External Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connection Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Overvoltage Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
High-Vibration Application Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
I/O Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Protecting the Module from Flyback Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Increasing Current Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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NI-9476 Getting Started

Before You Begin
Read the NI-9476 Safety, Environmental, and Regulatory Information and
complete the soware and hardware installation procedures in your chassis
documentation.
Safety Guidelines
Caution Observe all instructions and cautions in the user documentation.
Using the product in a manner not specified can damage the product and
compromise the built-in safety protection.
Attention Suivez toutes les instructions et respectez toutes les mises
en garde de la documentation d'utilisation. L'utilisation du produit de
toute autre façon que celle spécifiée risque de l'endommager et de
compromettre la protection de sécurité intégrée.
Safety Guidelines for Hazardous Voltages
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 Ensure that devices and circuits connected to the module are
properly insulated from human contact.
© National Instruments 3
NI-9476 Getting Started

Caution When module terminals are hazardous voltage LIVE (>42.4 Vpk/60
V DC), you must ensure that devices and circuits connected to the module
are properly insulated from human contact.
NI-9476 with Spring Terminal Safety Voltages
Connect only voltages that are within the following limits.
Vsup-to-COM 40 V DC maximum
DO VCOM ≤ VDO ≤ Vsup
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 250 V RMS, Measurement Category II
Withstand up to 5,000 m 3,000 V RMS, verified by a 5 s dielectric withstand test
NI-9476 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Vsup-to-COM 40 V DC maximum
DO VCOM ≤ VDO ≤ Vsup
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC, Measurement Category 1
Withstand up to 2,000 m 1,000 V RMS, verified by a 5 s dielectric withstand test
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NI-9476 Getting Started

Safety Guidelines for Hazardous Locations
The NI-9476 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 Gc and Ex nA IIC T4 Gc 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 o or the area is known to be nonhazardous.
Caution Do not remove modules unless power has been switched o or
the area is known to be nonhazardous.
Caution Substitution of components may impair suitability for Class I,
Division 2, or Zone 2.
Caution The system must be installed in an enclosure certified for the
intended hazardous (classified) location, having a tool secured cover/door,
where a minimum protection of at least IP54 is provided.
Special Conditions for Hazardous Locations Use in Europe and
Internationally
The NI-9476 with spring terminal has been evaluated as Ex nA IIC T4 Gc equipment
under DEMKO 12 ATEX 1202658X and is IECEx UL 14.0089X certified. The NI-9476
with DSUB has been evaluated as Ex nA IIC T4 Gc equipment under DEMKO 03 ATEX
0324020X and is IECEx UL 14.0089X certified. Each NI-9476 is marked II 3G and is
suitable for use in Zone 2 hazardous locations, in ambient temperatures of -40 °C ≤
Ta ≤ 70 °C. If you are using the NI-9476 in Gas Group IIC hazardous locations, you
must use the device in an NI chassis that has been evaluated as Ex nC IIC T4, Ex IIC
T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.
© National Instruments 5
NI-9476 Getting Started

Caution Transient protection shall be provided that is set at a level not
exceeding 140% of the peak rated voltage value of 85 V at the supply
terminals to the equipment.
Caution The system shall only be used in an area of not more than
Pollution Degree 2, as defined in IEC/EN 60664-1.
Caution The system shall be mounted in an ATEX/IECEx-certified
enclosure with a minimum ingress protection rating of at least IP54 as
defined in IEC/EN 60079-15.
Caution The enclosure must have a door or cover accessible only by the
use of a tool.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits
for electromagnetic compatibility (EMC) stated in the product specifications. These
requirements and limits provide reasonable protection against harmful interference
when the product is operated in the intended operational electromagnetic
environment.
This product is intended for use in industrial locations. However, harmful
interference may occur in some installations, when the product is connected to a
peripheral device or test object, or if the product is used in residential or
commercial areas. To minimize interference with radio and television reception and
prevent unacceptable performance degradation, install and use this product in strict
accordance with the instructions in the product documentation.
Furthermore, any changes or modifications to the product not expressly approved
by National Instruments could void your authority to operate it under your local
regulatory rules.
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NI-9476 Getting Started

Special Conditions for Marine Applications
Some products are approved for marine (shipboard) applications. To verify marine
approval certification for a product, visit ni.com/product-certifications, search by
model number, and click the appropriate link.
Notice In order to meet the EMC requirements for marine applications,
install the product in a shielded enclosure with shielded and/or filtered
power and input/output ports. In addition, take precautions when
designing, selecting, and installing measurement probes and cables to
ensure that the desired EMC performance is attained.
Preparing the Environment
Ensure that the environment in which you are using the NI-9476 meets the following
specifications.
Operating temperature (IEC 60068-2-1, IEC 60068-2-2) -40 °C to 70 °C
Operating humidity (IEC 60068-2-78) 10% RH to 90% RH, noncondensing
Pollution Degree 2
Maximum altitude
NI-9476 with spring terminal 5,000 m
NI-9476 with DSUB 2,000 m
Indoor use only.
Note Refer to the device datasheet on ni.com/manuals for complete
specifications.
NI-9476 Pinout
© National Instruments 7
NI-9476 Getting Started

DO16
DO17
DO18
DO19
DO20
DO21
DO22
DO23
Vsup
Vsup
DO24
DO25
DO26
DO27
DO28
DO29
DO30
DO31
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
Vsup
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
COM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
DO0
DO1
DO3
DO5
DO7
DO9
DO11
DO13
DO15
COM
DO2
DO4
DO6
DO8
DO10
DO12
DO14
COM
DO17
DO16
DO18
DO20
DO22
DO24
DO26
DO28
DO30
Vsup
DO19
DO21
DO23
DO25
DO27
DO29
DO31
Vsup
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Signal Description
COM Common reference connection
DO Digital output signal connection
Vsup Voltage supply input connection
Table 1. Signal Descriptions
Connecting a Device
Connect the device to DO and COM, and connect the external power supply to Vsup
and COM.
Note When DO is o, DO is not connected to COM. For devices with large
source impedances, you must use a pull-down resistor between DO and
COM. Visit ni.com/info and enter the Info Code CSeriesDOPulseGen for
more information.
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NI-9476 Getting Started

Connecting an External Power Supply
You must connect an external power supply with a 6 V DC to 36 V DC voltage range to
the NI-9476. This power supply provides the current for the devices you connect to
the module. You can connect only one external voltage supply to the NI-9476.
1. Connect the positive lead of the power supply to Vsup.
2. Connect the negative lead of the power supply to COM.
Caution Do not remove or insert modules if the external power supply
connected to the Vsup and COM pins is powered on.
Connection Guidelines
■ Make sure that devices you connect to the NI-9476 are compatible with the
module specifications.
■ You must use 2-wire ferrules to create a secure connection when connecting
more than one wire to a single terminal on the NI-9476.
■ For the NI-9476 with spring terminal, push the wire into the terminal when
using a solid wire or a stranded wire with a ferrule.
■ For the NI-9476 with spring terminal, open the terminal by pressing the
push button when using stranded wire without a ferrule.
■ For CAT II measurements, you must use a power supply with isolated DC
outputs.
Overvoltage Protection
The NI-9476 provides overvoltage protection between any two inputs.
Note Refer to the device datasheet on ni.com/manuals for more
information about overvoltage protection.
© National Instruments 9
NI-9476 Getting Started

High-Vibration Application Connections
If your application is subject to high vibration, NI recommends that you use the
NI-9940 backshell kit to protect connections to the NI-9476 with spring terminal.
I/O Protection
The NI-9476 is protected against overcurrent, inrush, and short-circuit conditions in
accordance with IEC 61131-2.
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 o and on until the short circuit is
removed or the current returns to an acceptably low level.
Each channel has a status line that indicates in soware whether the channel is in
an overcurrent state.
Protecting the Module from Flyback Voltages
Install an external flyback diode if the NI-9476 is switching an inductive or energy-
storing device such as a solenoid, motor, or relay, and the device does not have
flyback protection.
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NI-9476 Getting Started

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. You must turn all parallel channels on and o simultaneously so that the
current on any single channel cannot exceed the 250 mA rating.
Where to Go Next
CompactRIO NI CompactDAQ
Located at ni.com/manuals
RELATED INFORMATION
C Series Documentation
& Resources
ni.com/info cseriesdoc
Services
ni.com/services
Installs with the software
NI 9476 Datasheet
NI-RIO Help
LabVIEW FPGA Help
NI 9476 Datasheet
NI-DAQmx Help
LabVIEW Help
NI Services
Visit ni.com/support to find support resources including documentation,
downloads, and troubleshooting and application development self-help such as
tutorials and examples.
© National Instruments 11
NI-9476 Getting Started

Visit ni.com/services to learn about NI service oerings such as calibration options,
repair, and replacement.
Visit ni.com/register to register your NI product. Product registration facilitates
technical support and ensures that you receive important information updates from
NI.
NI corporate headquarters is located at 11500 N Mopac Expwy, Austin, TX,
78759-3504, USA.
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NI-9476 Getting Started
© 2022 National Instruments Corporation.