National Instruments NI 9476 Manuale utente
OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9476
32-Channel, 24 V, Sourcing Digital Output Module
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NI 9476 Operating Instructions and Specifications 2 ni.com
This document describes how to use the National Instruments 9476
and includes specifications and pin assignments for the NI 9476.
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 9476. 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 9476 Operating Instructions and Specifications
Safety Guidelines
Operate the NI 9476 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 9476 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 youare installing the NI 9476 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 9476 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 external power supply and the Vsup
pin. The device must prevent the Vsup-to-COM voltage
from exceeding 50 V if there is a 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 youare using the NI 9476 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 9476 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 9476 Operating Instructions and Specifications 6 ni.com
Connecting the NI 9476
The NI 9476 has a 37-pin DSUB connector that provides
connections for 32 digital output channels.
Figure 1. NI 9476 Pin Assignments
DO16
DO17
DO18
DO19
DO20
DO21
DO22
DO23
Vsup
Vsup
DO24
DO25
DO26
DO27
DO28
DO29
DO30
DO31
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
Vsup
Vsup
DO8
DO9
DO10
DO11
DO12
DO13
DO14
DO15
COM
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
26
27
28
29
30
31
32
33
34
35
36
37
© National Instruments Corp. 7 NI 9476 Operating Instructions and Specifications
Each channel has a DO pin to which youcan connect a digital input
device. The 32 digital output channels are internally referenced to
COM.
Yo umust connect an external power supply to the NI 9476. The
power supply provides the current for the output channels. Connect
the positive lead of the power supply to the supply pin, Vsup, and
the negative lead of the power supply to the common pin, COM.
Refer to the Specifications section for information about the power
supply voltage range.
Note The Vsuppins are internally connected. Youcan
connect only one external voltage supply to the device.
Caution Do not remove or insert modules if the external
power supply connected to the Vsupand COM pins is
powered on.
The NI 9476 has current sourcing outputs, meaning the DO pin is
driven to Vsupwhen the channel is turned on.
NI 9476 Operating Instructions and Specifications 8 ni.com
Yo ucan directly connect the NI 9476 to a variety of industrial
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices youconnect to the NI 9476 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 COM, and connect the external
power supply to Vsupand COM, as shown in Figure 2.
Figure 2. Connecting a Device to the NI 9476
NI 9476
+
_
COM
V
sup
Device
DO
External
Power
Supply
© National Instruments Corp. 9 NI 9476 Operating Instructions and Specifications
Increasing Current Drive
Each channel has a continuous output current of 250 mA. If you
want to increase the output current to a device, youcan connect
any number of channels together in parallel. For example, if you
want to drive 1 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 250 mA rating.
Figure 3. Increasing the Current to a Device Connected to the NI 9476
NI 9476
250 mA
250 mA
250 mA
250 mA
DO3
DO1
DO0
DO2
1 A
+
_
Device
COM
External
Power
Supply
V
sup
NI 9476 Operating Instructions and Specifications 10 ni.com
Protecting the Module from Flyback Voltages
If the module is switching an inductive or energy-storing device
such as a solenoid, motor, or relay, and the device does not have
flyback protection, install an external flyback diode as shown in
Figure 4.
Figure 4. Connecting a Flyback Diode to the NI 9476
External
Power
Supply
NI 9476
+
_
COM
V
sup
Inductive
Device
DO
Flyback
Diode
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