National Instruments NI 9475 User Manual
OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9475
8-Channel, 60 V, High-Speed, Sourcing Digital Output
Module
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This document describes how to use the National Instruments 9475
and includes specifications and pin assignments for the NI 9475.
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 9475. 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 9475 Operating Instructions and Specifications 2 ni.com
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 haza rdous 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.
© National Instruments Corp. 3 NI 9475 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 input signal and the NI 9475 input
pin. The device must prevent the input V
-to-COM
sup
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.
NI 9475 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 9475 Operating Instructions and Specifications
Connecting the NI 9475
The NI 9475 has a 25-pin DSUB connector that provides
connections for eight digital output channels.
03
47
1
DO0
14
15
Vsup
DO1
16
17
DO2
Vsup
18
19
DO3
20
DO4
21
Vsup
22
DO5
23
DO6
24
Vsup
25
DO7
Figure 1. NI 9475 Pin Assignments
NI 9475 Operating Instructions and Specifications 6 ni.com
COM
2
Vsup
3
COM
4
COM
5
Vsup
6
COM
7
COM
8
Vsup
9
COM
10
COM
11
Vsup
12
COM
13
COM
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 V
sup
pin.
National Instruments recommends you provide independent COM
and V
COM and V
wiring for each channel to minimize current flow in the
sup
wiring. The COM pins are all connected together
sup
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.
Yo u 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 V
sup
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 V
and COM pins is
sup
powered on.
The NI 9475 has current sourcing outputs, meaning the DO pin is
driven to V
© National Instruments Corp. 7 NI 9475 Operating Instructions and Specifications
when the channel is turned on.
sup
Yo u 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
DO
Device
COM
NI 9475
Figure 2. Connecting a Device to the NI 9475
NI 9475 Operating Instructions and Specifications 8 ni.com
+
Power
–
Supply
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