Chapter 2
Configuration and Installation
© National Instruments Corporation
2-11
SCXI-1162 User Manual
Ω
+
_
360
SCXI-1162
Vcc
+
_
Channel 3
Channel 2
Channel 1
Channel 0
In 0
In 1
In 2
Current
S2
S1
High CMV
(up to 450 VAC or VDC)
Current
Current
In 3
Ω
360
Ω
360
Ω
360
Logic
Gate
5-10 V
Load
Power
Supply
Figure 2-3. Signal Connection Examples
Figure 2-3 shows Vcc connected to the positive voltage of a 5 to 10 V power supply. An input
senses a logic low when it is driven to the negative voltage of this supply. For example, In 0 is
sensing whether a load is being powered. Closing switch S1 will connect In 0 and the negative
terminal of the load to the negative supply voltage, thus powering the load and returning a logic
low for channel 0. With switch S1 open, current does not flow through the load or through In 0,
and a logic high is returned.