National Instruments NI 9475 User manual

NI-9475 Getting
Started
2022-07-06

Contents
Before You Begin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Voltages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Guidelines for Hazardous Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electromagnetic Compatibility Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Special Conditions for Marine Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preparing the Environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connecting the NI 9475. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting an External Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connecting a Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Increasing Current Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
I/O Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Detecting an Overcurrent Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power Supplies and Overcurrent Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Resetting Channels aer an Overcurrent Condition. . . . . . . . . . . . . . . . . . . . . . . . . 9
Where to Go Next. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
NI Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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NI-9475 Getting Started

Before You Begin
Read the NI-9475 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 Voltages
Connect only voltages that are within the following limits:
Vsup-to-COM 60 V DC maximum, Measurement Category I
Isolation
Channel-to-channel None
Channel-to-earth ground
Continuous 60 V DC, Measurement Category I
Withstand 1,000 V RMS, verified by a 5 s dielectric withstand test
© National Instruments 3
NI-9475 Getting Started

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.
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.
Safety Guidelines for Hazardous Locations
The NI-9475 is suitable for use in hazardous locations; , and 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 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.
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NI-9475 Getting Started

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-9475 has been evaluated as equipment under DEMKO ATEX and is IECEx
certified. Each NI-9475 is marked 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-9475
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.
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
© National Instruments 5
NI-9475 Getting Started

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.
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-9475 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 2,000 m
Indoor use only.
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NI-9475 Getting Started

Note Refer to the device datasheet on ni.com/manuals for complete
specifications.
Connecting the NI 9475
The NI 9475 provides connections for eight digital output channels.
Figure 1. NI 9475 Pinout
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
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
03
4 7
Signals
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. NI 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 o.
Connecting an External Power Supply
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.
Caution Do not remove or insert modules if the external power supply
connected to the Vsup and COM pins is powered on.
© National Instruments 7
NI-9475 Getting Started

The NI 9475 has current sourcing outputs, which means the DO pin is driven to Vsup
when the channel is turned on.
Connecting a Device
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.
Connect the device to DO and connect the common of the device to COM.
Figure 2. Connecting a Device to the NI 9475
External
Power
Supply
Device
COM
DO
Vsup
NI 9475
+
–
Note When the device is o, DO is not connected to COM. For 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.
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 the following figure. You must turn all parallel channels on and o
simultaneously so that the current on any single channel cannot exceed the 1 A
rating.
Figure 3. Increasing the Current to a Device Connected to the NI 9475
NI 9475
DO3
DO1
DO0
DO2
4 A
+
_
COM
1 A
1 A
1 A
1 A
External
Power
Supply
Device
Vsup
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NI-9475 Getting Started

I/O Protection
The NI-9475 provides short-circuit protection.
Each channel has circuitry that protects it from current surges resulting from short
circuits over .
Note Refer to the device datasheet at ni.com/manuals for maximum
continous output current, short-circuit behavior, and short-circuit trip time
specifications and information about conditions that may damage the
module.
Note Refer to the IEC 61131-2 standard for more information about short-
circuit-proof devices.
Note Because the NI-9475 includes internal flyback diodes, you do not
need to add external diodes when connecting to switching devices that
store energy.
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 soware nor the
module LEDs indicate if an overcurrent condition occurs. A channel LED may be on
even if the channel is o 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.
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.
© National Instruments 9
NI-9475 Getting Started

Resetting Channels aer an Overcurrent Condition
Aer you have determined and fixed the cause of an overcurrent condition, reset the
channel by turning it o.
Alternatively, you can disconnect the external power supply from the chassis.
However, doing so disconnects power from all the module channels.
Normal operation can resume aer you correct the overcurrent condition and reset
the channel.
Where to Go Next
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.
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-9475 Getting Started
© 2022 National Instruments Corporation.