OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9472/9474
8-Channel Digital Output Modules
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This document describes how to use the National Instruments 9472
and National Instruments 9474 and includes specifications and
terminal or pin assignments. In this document, the NI 9472/9474
with screw terminal and NI 9472 with DSUB are referred to
inclusively as the NI 9472/9474. Visit
rdsoftwareversion to determine which software you need for
ni.com/info and enter
the modules you are 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 9472/9474. 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.
Safety Guidelines
Operate the NI 9472/9474 only as described in these operating
instructions.
NI 9472/9474 2 ni.com
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Voltages
Yo u can connect hazardous voltages only to the NI 9472/9474 with
screw terminal. Do not connect hazardous voltages to the NI 9472
with DSUB.
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk or 60 VDC to earth ground.
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 Make sure that devices and circuits connected to
the module are properly insulated from human contact.
Caution When module terminals are hazardous voltage
LIVE (>42.4 V
© National Instruments Corp. 3 NI 9472/9474
/60 VDC), you must ensure that devices
pk
and circuits connected to the module are properly
insulated from human contact. You must use the NI 9932
connector backshell kit to ensure that the terminals are
not accessible.
Figure 1 shows the NI 9932 connector backshell.
Note Yo u can use the NI 9932 connector backshell only
with the NI 9472/9474 with screw terminal.
Figure 1. NI 9932 Connector Backshell
NI 9472/9474 4 ni.com
Safety Guidelines for Hazardous Locations
The NI 9472/9474 is suitable for use in Class I, Division 2,
Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2,
AEx nC IIC T4 and Ex nC IIC T4 hazardous locations; and
nonhazardous locations only. Follow these guidelines if you are
installing the NI 9472/9474 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.
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.
© National Instruments Corp. 5 NI 9472/9474
Caution For Zone 2 applications, install a protection
device between the V
and COM terminals on the
sup
NI 9472/9474. The device must prevent the input
V
-to-COM voltage from exceeding 42 V if there is a
sup
transient overvoltage condition.
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9472/9474 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 9472/9474 6 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. 7 NI 9472/9474
Connecting the NI 9472/9474
The NI 9472/9474 provides connections for eight digital output
channels.
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
COM
03
47
0
1
2
3
4
5
6
7
8
9
DO0
Vsup
DO1
DO2
Vsup
DO3
DO4
Vsup
DO5
DO6
Vsup
DO7
03
47
1
14
15
16
17
18
19
20
21
22
23
24
25
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
Figure 2. NI 9472/9474 Terminal and Pin Assignments
NI 9472/9474 8 ni.com
The NI 9472/9474 with screw terminal has a 10-terminal,
detachable screw-terminal connector. The NI 9472 with DSUB has
a 25-pin DSUB connector. Each channel of the NI 9472/9474 has
a terminal or pin, DO, to which you can connect a device. The
eight digital output channels are internally referenced to the
common terminal or pin, COM. National Instruments recommends
you provide independent COM and V
wiring for each channel of
sup
the NI 9472 with DSUB to minimize current flow in the COM and
V
wiring. The COM pins on the NI 9472 with DSUB are
sup
internally connected..
Note Yo u must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9472/9474 with screw terminal.
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. The LEDs are disabled when the chassis is
in sleep mode. Refer to the Sleep Mode section for more
information about sleep mode.
© National Instruments Corp. 9 NI 9472/9474
Yo u must connect an external power supply to the NI 9472/9474.
This power supply provides the current for the devices you connect
to the module. Connect the positive lead of the power supply to
V
and the negative lead of the power supply to COM. The V
sup
sup
pins on the NI 9472 with DSUB are internally connected. You can
connect only one external voltage supply to the device. 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 9472/9474 has current sourcing outputs, meaning the DO
terminal or pin is driven to V
NI 9472/9474 10 ni.com
when the channel is turned on.
sup
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