FP-DI-330 and cFP-DI-330
8
ni.com
If the sinking-output device is connected to a power supply,
connect the power supply to the IN
a
terminal of the [c]FP-DI-330.
Figure 8.
Wiring the [c]FP-DI-330 to an Externally Powered
Sinking-Output Device
Connecting a Load to the [c]FP-DI-330
If you want to use the [c]FP-DI-330 to sense the power that is
applied to a load, connect the IN
a
and IN
b
terminals to the load.
Figure 9.
Wiring the [c]FP-DI-330 to a Load
Universal Input Circuit
The [c]FP-DI-330 has eight current-limited universal input
channels with bi-directional optical isolators. Each channel has
two interchangeable signal inputs, IN
a
and IN
b
. When you apply
a voltage across the IN
a
and IN
b
terminals, signal current flows
through the input circuitry and turns on the optical isolator,
registering as an ON condition. The current-limiting circuitry
limits the amount of current flow to 1.5 mA.
+
–
Sinking-
Output
Device
(NPN)
[c]FP-DI-330
V
SUP
COM
V
C
Input
Circuitry
IN
b
IN
a
Load
[c]FP-DI-330
V
SUP
COM
V
C
Input
Circuitry
IN
b
IN
a
+
–