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Appendix B Connecting I/O Signals
NI 7831R User Manual B-4 ni.com
Connecting to CompactRIO Extension I/O Chassis
You can use the CompactRIO R Series Expansion chassis and CompactRIO
I/O modules with the NI 7831R. Refer to the CompactRIO R Series
Expansion System Installation Instructions for information about
connecting the chassis to the NI 7831R.
Table B-2. NI 7831R I/O Signal Summary
Signal Name
Signal
Type and
Direction
Impedance
Input/
Output
Protection
(Volts)
On/Off
Source
(mA at V)
Sink
(mA at V)
Rise Time Bias
+5V DO — — — — — —
AI<0..7>+ AI 10 GΩ in
parallel with
100 pF
42/35 — — — ±2nA
AI<0..7>– AI 10 GΩ in
parallel with
100 pF
42/35 — — — ±2nA
AIGND AO — — — — — —
AISENSE AI 10 GΩ in
parallel with
100 pF
42/35 — — — ±2nA
AO<0..7> AO 1.25 Ω Short-
circuit to
ground
2.5 at 10 2.5 at –10 10 V/µs —
AOGND AO — — — — — —
DGND DO — — — — — —
DIO<0..15>
Connector 0
DIO<0..39>
Connector <1..2>
DIO — –0.5
to +7.0
5.0 at 2.4 5.0 at 0.4 12 ns —
AI = Analog Input AO = Analog Output DIO = Digital Input/Output DO = Digital Output