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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NI 9475 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9475
and includes specifications and pin assignments for the NI 9475.
Visit ni.com/info and enter rdsoftwareversion to determine
which software youneed for the modules youare using. For
information about installing, configuring, and programming the
system, refer to the system documentation. Visit ni.com/info
and enter cseriesdoc for information about C Series
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.
© National Instruments Corp. 3 NI 9475 Operating Instructions and Specifications
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 youare 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.
NI 9475 Operating Instructions and Specifications 4 ni.com
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 youare 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.
© National Instruments Corp. 5 NI 9475 Operating Instructions and Specifications
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.
NI 9475 Operating Instructions and Specifications 6 ni.com
Connecting the NI 9475
The NI 9475 has a 25-pin DSUB connector that provides
connections for eight digital output channels.
Figure 1. NI 9475 Pin Assignments
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
47
© National Instruments Corp. 7 NI 9475 Operating Instructions and Specifications
Each channel of the NI 9475 has a DO pin to which youcan
connect a device. Each channel also has a COM pin and a Vsuppin.
National Instruments recommends youprovide 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.
Yo umust connect an external power supply to the NI 9475. This
power supply provides the current for the devices youconnect 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 Vsupand COM pins is
powered on.
The NI 9475 has current sourcing outputs, meaning the DO pin is
driven to Vsupwhen the channel is turned on.
NI 9475 Operating Instructions and Specifications 8 ni.com
Yo ucan directly connect the NI 9475 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices youconnect 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.
Figure 2. Connecting a Device to the NI 9475
External
Power
Supply
Device
COM
DO
Vsup
NI 9475
+
–
© National Instruments Corp. 9 NI 9475 Operating Instructions and Specifications
Increasing Current Drive
Each channel has a continuous output current of 1 A. If youwant
to increase the output current to a device, youcan connect any
number of channels together in parallel. For example, if youwant
to drive 4 A of current, connect DO<0..3> in parallel as shown
in Figure 3. Youmust turn all parallel channels on and off
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
V
sup
NI 9475 Operating Instructions and Specifications 10 ni.com
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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