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Chapter 4
Signal Connections
•
Analog Input Ground—To help keep digital noise out of the analog input, a separate return
connection is available. Use this reference ground connection and not Digital Ground
(digital I/O reference) as the reference for the analog inputs.
Tip
Refer to the
Measuring Floating (Nonreferenced) Sources
section of the
Field
Wiring and Noise Considerations for Analog Signals
NI Developer Zone document
at
ni.com/zone
for more information about analog input connections.
Wiring Concerns
For proper use of each ADC input channel, the analog signal to be measured should be connected
to the channel input and its ground reference connected to the Analog Input Ground.
Note
The analog reference output is an output signal only and must not connect to
an external reference voltage. Connect the common of the external reference to the
Analog Input Ground pin for proper A/D reference and improved voltage
measurement.
Other Motion I/O Connection
The NI 7330 motion controller provides the following other motion I/O connection:
•
Host +5 V—This signal is the in5 V supply of the host computer. It is typically used
to detect when the host computer is powered on and to shut down external motion system
components when the host computer is powered off or disconnected from the motion
accessory.
Caution
The host +5 V signal is limited to <100 mA and should not be used to
power any external devices, except those intended in the host bus monitor circuits on
the UMI and drive products.
