National Instruments FieldPoint cFP-DIO-550, Operating Instructions Manual, Page: 8 / 22

© National Instruments Corp. 7 FP-DIO-550 and cFP-DIO-550
Connecting a Sinking-Output Device
to the [c]FP-DIO-550
You can connect an externally powered sinking-output device to an
input channel of the [c]FP-DIO-550. A sinking-output device
provides a path to ground. Connect the positive terminal of the
power supply to the IN+ terminal of the channel and connect the
output terminal of the device to the IN– terminal of the channel.
Refer to Figure 5.
Figure 5. Connecting an Externally Powered Sinking-Output Device
to One Channel of the [c]FP-DIO-550
Connecting a Sourcing-Output Device
to the [c]FP-DIO-550
You can connect an externally powered sourcing-output device to
an input channel of the [c]FP-DIO-550. A sourcing-output device
provides a path to a voltage source. Connect the output terminal
of the device to the IN+ terminal of the channel and connect the
negative terminal of the external power supply to the IN– terminal
of the channel. Refer to Figure 6.
Figure 6. Connecting an Externally Powered Sourcing-Output Device
to One Channel of the [c]FP-DIO-550
IN–
IN+
Input
Circuitry
Sinking-
Output
Device
(NPN)
V C
+
–
[c]FP-DIO-550
External
Power
Supply
(30 V Max)
IN–
IN+
Input
Circuitry
Sourcing-
Output
Device
(PNP)
V C
+
–
External
Power
Supply
(30 V Max)
[c]FP-DIO-550
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