Figure 1. Connecting an Industrial Device to the NI-9472
External
Power
Supply
NI 9472
+
–
COM
V
sup
Device
DO
Caution
Do not install or remove C Series modules from your system if
any external power supplies connected to the V
sup
and COM pins are
powered on.
Attention
Ne pas installer ou retirer les modules de la Série C de votre
système si une alimentation externe connectée aux broches V
sup
et COM
est sous tension.
Ensure that the devices you connect to the NI-9472 are compatible with the output
specifications of the NI-9472. Refer to the device datasheet at
for
output specifications.
Note
When the industrial device is off, DO is not connected to COM. For
large source impedances, you must use a pull-down resistor between DO
and COM. Go to
for more information.
Increasing Current Drive
Each channel of the NI-9472 has a continuous output current of 0.75 A. 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 3 A of current, connect DO0 through DO3 in
parallel, as shown in the following figure. You must turn all parallel channels on and
off simultaneously so that the current on any single channel cannot exceed the
0.75 A rating.
© National Instruments
11
NI-9472 Getting Started