OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9476E
32-Channel, 24 V Sourcing Digital Output Module
This document describes how to use the National Instruments 9476E
and includes dimensions, connector assignments, and specifications for
the NI 9476E. Visit 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
enter
cseriesdoc for information about C Series documentation.
Caution National Instruments makes no electromagnetic
compatibility (EMC) or CE marking compliance claims
for the NI 9476E. The end-product supplier is responsible
for conformity to any and all compliance requirements.
Caution The NI 9476E must be installed inside a suitable
enclosure prior to use. Hazardous voltages may be present.
Caution Do not operate the NI 9476E in a manner not
specified in these operating instructions. Product misuse
can result in a hazard. You can compromise the safety
ni.com/info and
protection built into the product if the product is damaged
in any way. If the product is damaged, return it to National
Instruments for repair.
2 | ni.com | NI 9476E Operating Instructions and Specifications
NI 9476E Dimensions
73.4 (2.89)
0.0 (0.00)
58.4 (2.30)
0.0 (0.00)
The following figure shows the dimensions of the NI 9476E.
Figure 1. NI 9476E Dimensions in Millimeters (Inches)
NI 9476E Operating Instructions and Specifications | © National Instruments | 3
Connecting the NI 9476E
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
The NI 9476E has a 37-pin DSUB connector that provides
connections for 32 digital output channels.
Figure 2. NI 9476E Pin Assignments
4 | ni.com | NI 9476E Operating Instructions and Specifications
Each channel has a DO pin to which you can connect a digital input
device. The 32 digital output channels are internally referenced
to COM.
You must 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, V
sup
, 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 V
pins are internally connected. You can
sup
connect only one external voltage supply to the device.
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 9476 has current sourcing outputs, meaning the DO pin is
driven to V
when the channel is turned on.
sup
NI 9476E Operating Instructions and Specifications | © National Instruments | 5
You can directly connect the NI 9476 to a variety of industrial
NI 9476
+
_
COM
V
sup
Device
DO
External
Power
Supply
devices such as solenoids, motors, actuators, relays, and lamps.
Make sure the devices you connect 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 V
Figure 3. Connecting a Device to the NI 9476
Caution To ensure a grounded connection, use shielded
I/O cables and tie the shield to the chassis ground.
and COM, as shown in Figure 3.
sup
6 | ni.com | NI 9476E 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, you can 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 4. You must turn all parallel channels on and off
simultaneously so that the current on any single channel cannot
exceed the 250 mA rating.
Figure 4. Increasing the Current to a Device Connected to the NI 9476
V
sup
DO0
DO1
DO2
DO3
COM
NI 9476
NI 9476E Operating Instructions and Specifications | © National Instruments | 7
250 mA
250 mA
250 mA
250 mA
1 A
Device
External
+
_
Power
Supply
Loading...