NI 6520/6521 User Guide
14
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Input Signal Connection Example
Figure 6 and Figure 7 show signal connections for a supply connected to an
isolated input. The power supply can be any DC voltage within the
NI 6520/6521 device range. Refer to the device specifications for
information about voltage ranges.
Figure 6.
NI 6520 Input Signal Connection Example
Figure 7.
NI 6521 Input Signal Connection Example
P0.
X
+
P0.
X
–
0 V~ +30 V
or
0 V~ –30 V
2.43 k
Ω
+3.3 V
AC Input
Photocoupler
+3.3 V
P0.
X
+
P0.
X
–
Signal
Common
Mode
0 V~ +30 V
or
0 V~ –30 V
2.43 k
Ω
Up to 120 V
Common-Mode
Voltage
AC Input
Photocoupler