3-14
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ni.com
Chapter 3
Signal Connections
Figure 3-13 shows an example of wiring the digital input signals to a sourcing output device.
Figure 3-14 shows an example of wiring the digital input signals to a sinking output device.
Figure 3-13.
Digital Input Configured for Sinking
Figure 3-14.
Digital Input Configured for Sourcing
Figure 3-15 shows an example of wiring the digital inputs to a high-side switch. Figure 3-16
shows an example of wiring the digital inputs to a low-side switch.
Figure 3-15.
High-Side Switch Connected to a Sinking Digital Input
PNP (
S
o
u
rcing)
O
u
tp
u
t Device
COM
NI 951x
V–
(Reference)
V+
O
u
t
Limit, Home,
or Digit
a
l Inp
u
t
Limit, Home,
or Digit
a
l Inp
u
t
C
u
rrent
Limiting
Circ
u
it
COM
NI 951x
O
u
t
Limit, Home,
or Digit
a
l Inp
u
t
V–
(Reference)
V+
NPN (
S
inking)
O
u
tp
u
t Device
Limit, Home,
or Digit
a
l Inp
u
t
C
u
rrent
Limiting
Circ
u
it
High-
S
ide
S
witch
NI 951x
NI 951x V
su
p
Limit, Home,
or Digit
a
l Inp
u
t
Config
u
red
For
S
inking
COM
Limit, Home,
or Digit
a
l Inp
u
t