NI-9207 User Manual

Connector Types

The NI-9207 has more than one connector type: NI-9207 with spring terminal and NI-9207 with DSUB. Unless the connector type is specified, NI-9207 refers to both connector types.

NI-9207 Block Diagram



The input signals are scanned, amplified, conditioned, and then sampled by a single 24-bit ADC.

NI-9207 Pinout



Table 2. Signal Descriptions
Signal Description
AI+ Positive analog input voltage connection
AI- Negative analog input signal connection
AI Analog input current connection
Vsup Voltage supply connection
COM Common reference connection to isolated ground

Floating Differential Connections



Grounded Connections



Make sure the voltage on the AI+ and AI- connections are in the channel-to-earth safety voltage range to ensure proper operation.

Single-Ended Connections



Connecting an External Power Supply

You must connect an external power supply with a 0 to 30 V voltage range to the NI-9207. This power supply provides the current for the devices you connect to the module. You can connect only one external voltage supply to the NI-9207.
  1. Connect the positive lead of the power supply to Vsup.
  2. Connect the negative lead of the power supply to COM.
Caution Do not remove or insert modules if the external power supply connected to the Vsup and COM pins is powered on.

Connecting a Loop-Powered Current Transducer



Connecting a Three-Wire Current Transducer



NI-9207 Connection Guidelines

  • Make sure that devices you connect to the NI-9207 are compatible with the module specifications.
  • You must use 2-wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI-9207 with spring terminal.
  • When using a solid wire or a stranded wire with a ferrule with the NI-9207 with spring terminal, push the wire into the terminal.
  • When using stranded wire without a ferrule with the NI-9207 with spring terminal, open the terminal by pressing the push button.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you use the NI-9940 backshell kit to protect connections to the NI-9207 with spring terminal.