National Instruments NI 9472 User manual

OPERATING INSTRUCTIONS
NI 9472/9474
8-Channel Digital Output Modules

NI 9472/9474 Operating Instructions 2 ni.com
These operating instructions describe how to use the National
Instruments NI 9472 and the NI 9474. In this document, the
NI 9472 with screw terminal and NI 9472 with DSUB are referred
to inclusively as the NI 9472. For information about installing,
configuring, and programming the system, refer to the system
documentation. To determine which software you need for the
modules you are using, go to ni.com/info and enter the info code
rdsoftwareversion.
Note The safety guidelines and specifications in this
document are specific to the NI 9472/9474. The other
components in the system may 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.
Safety Guidelines
Operate the NI 9472/9474 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.

© National Instruments Corp. 3 NI 9472/9474 Operating Instructions
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages to the NI 9472 with screw
terminal and the NI 9474 only. 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 When module terminals are hazardous voltage
LIVE (>42.4 Vpk/60 VDC), you must ensure that devices
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.

NI 9472/9474 Operating Instructions 4 ni.com
Note You can use the NI 9932 connector backshell only
with the NI 9472 with screw terminal.
Figure 1. NI 9932 Connector
Safety Guidelines for Hazardous Locations
The NI 9472/9474 is suitable for use in Class I, Division 2, Groups
A, B, C, D, and 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

© National Instruments Corp. 5 NI 9472/9474 Operating Instructions
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.
Caution For Zone 2 applications, install a protection
device between the input signal and the NI 9472/9474
input terminal. The device must prevent the input
Vsup-to-COM voltage from exceeding 42 V if there is a
transient overvoltage condition.

NI 9472/9474 Operating Instructions 6 ni.com
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 02 ATEX 0324020X. Each module
is marked II 3G and is suitable for use in Zone 2 hazardous
locations.
Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, go to
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/exit through opposing
enclosure walls.

© National Instruments Corp. 7 NI 9472/9474 Operating Instructions
Wiring the NI 9472/9474
The NI 9472/9474 provides connections for eight digital output
channels. The NI 9472/9474 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 the device. Each channel has an LED that
indicates the state of the channel.
You 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 the
supply terminal or pin, Vsup, and the negative lead of the power
supply to the common terminal or pin, COM. The eight digital
output channels are internally referenced to COM. Refer to Table 1
for the terminal assignments of the NI 9472 with screw terminal
and NI 9474. Refer to Figure 2 for the pin assignments of the
NI 9472 with DSUB.

NI 9472/9474 Operating Instructions 8 ni.com
Table 1. Terminal Assignments
Module Terminal Signal
0DO0
1DO1
2DO2
3DO3
4DO4
5DO5
6DO6
7DO7
8Supply (Vsup)
9Common (COM)
0
1
2
3
4
5
6
7
8
9
03
47

© National Instruments Corp. 9 NI 9472/9474 Operating Instructions
Figure 2. 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

NI 9472/9474 Operating Instructions 10 ni.com
Wiring for High Vibration Applications
National Instruments recommends using ferrules for terminating
wires to the detachable screw terminal connector or using the
NI 9932 backshell kit to protect the connections when you use the
NI 9472 with screw terminal or the NI 9474 in high-vibration
applications. Refer to Figure 3 for an illustration.
Figure 3. 10-pin Detachable Screw Terminal Connector with a Ferrule
Ferrule