NI Modules are classified into 14 subgroups:

Data Acquisition & Control Modules: Analogue Input and Output Modules, Voltage and Current, Bus Power, Digital Input, Output and I/O, Frequency, Multifunction I/O, Relay, Strain/Bridge, Temperature, Thermocouple, PXI Digital Pattern Instrument, and Sound/Vibration Input.

Expansion Modules: NI CompactRIO and PXIFPGA Modules: For Kintex, Spartan, Virtex and Xilinx Zynq devicesFrame Grabbers: Camera Link and Ethernet interfaces, PCI and PCI Express environments, for use with NI Machine Vision products. GPIB, Serial and Ethernet for Automotive Ethernet, PXI, C Series, FlexRIO, GPIB, and VXIIF Transceivers for NI FlexRIO and PXIInterface: C Series, CAN, CANopen, DeviceNet, LIN, CompactRIO, Fieldbus, FlexRay, FPD-Link, GMSL, I2C/SPI, LIN, PXI, Vehicle Multiprotocol InterfaceRelay: PXI – also a SPST Relay ModuleSignal Analysers: Search bandwidths from 1MHz to 765MHz. PXIe bus.Sound & Vibration: PCI and PXI, 2 – 16 channels, with AC, AC/DC, or DC analogue input couplingSwitch: Electromechanical, FET, Reed, and solid state, for PXI and PXIeTest Support modules for use with NI CompactDAQ/CompactRIO systems, FlexRIO instruments, PXI chassis, test equipment, PXI instrumentationTimer/Counter: 2, 8 or 32 channel modules for use with NI CompactDAQ, CompactRIO, DAQ, and PXI systemsVector Signal Transceiver: – Vehicle Radar Test System, 1GHz VST measurement, 9kHz to 6GHz