NI 9437 Getting Started Guide
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© National Instruments
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13
Connection Considerations
Keep in mind the following requirements when connecting to the
NI 9437.
•
The supply voltage to V
SUP
must be within the range of
24 VDC to 250 VDC.
•
Output devices that you connect to the NI 9437 must be able to
source enough current to overcome the NI 9437 input load
(burden). The NI 9437 burden is dynamic and varies
depending on the input voltage. Refer to the
NI 9437
Datasheet
on
ni.com/manual
s
for more information about
dynamic burden current on the NI 9437.
•
Output devices that you connect to the NI 9437 do not need to
sink current. The NI 9437 input load current pulls the input
voltage to a low value when the output device is open, high
impedance, or not connected.
•
The NI 9437 is immune to capacitively coupled transients
when using the correct debounce time based on the supply
voltage and the amount of capacitance in your system. Refer to
the
NI 9437 Datasheet
on
ni.com/manual
s
for more
information about debounce times.
•
Connecting more than one wire to a single terminal on the
NI 9437 requires 2-wire ferrules to create a secure connection.
