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National Instruments Corporation
21
NI WSN-3230/3231 User Guide and Specifications
Note
When configured in a digital output mode, reading the channel returns the state of the pin
voltage with TTL thresholds.
Digital Input Operational Modes
The channels support the following digital input operational modes:
•
•
24V Sinking with Power Management
•
•
Figure 18.
Simplified Circuit Diagram of One DIO Channel
Connecting Digital Outputs
You can connect a variety of industrial devices such as solenoids, relays, and indicators to the
NI WSN-3230/3231 device. Refer to the
section to ensure compatibility.
Note
You must use 2-wire ferrules to create a secure connection when connecting more than
one wire to a single terminal on the NI WSN-3230/3231.
Note
You can connect only one external DIO PWR supply to the NI WSN-3230/3231.
The power supply provides the current for the devices you connect to the NI WSN-3230/3231. Connect
the power supply positive lead to DIO PWR terminal and the power supply negative lead to one of the
DGND terminals. The DIO PWR terminal on the NI WSN-3230/3231 is internally connected to each
digital channel. Refer to the
section for information about the power supply voltage
range.
Note
The
and
Drive High and Low (Sinking and Sourcing)
external power supply connected to the DIO PWR terminal.
DIO PWR
High
S
ide
S
witch
TTL
P
u
ll Up
DIO
x
3
V
DGND
Low
S
ide
S
witch
DI
(Intern
a
l)
NI W
S
N-
3
2
3
0/
3
2
3
1
24V
S
inking Lo
a
d