PXIe-6323 32-Channel Multifunction I/O Module
The NI PXIe-6323 is a multifunction PXI Express data acquisition module designed for automated testing, laboratory measurement, device validation and control applications. It combines analog input, analog output, digital I/O and counter/timer resources in a single 3U PXI Express module.
The PXIe-6323 provides 32 single-ended or 16 differential analog input channels with 16-bit resolution and an aggregate sampling rate of up to 250 kS/s. It also includes four 16-bit analog outputs, 48 digital I/O lines and four 32-bit general-purpose counter/timers.
Onboard NI-STC3 timing technology provides separate timing engines for analog input, analog output, digital input, digital output and counter operations. This architecture allows several measurement and control tasks to operate concurrently with hardware-controlled timing.
Key Features of the PXIe-6323
- 32 single-ended or 16 differential analog inputs
- 16-bit analog input resolution
- 250 kS/s maximum aggregate analog input rate
- Four 16-bit analog outputs
- Up to 900 kS/s analog output update rate
- 48 digital I/O lines
- Up to 32 hardware-timed digital I/O lines
- Four 32-bit general-purpose counter/timers
- Software-selectable analog input ranges
- Analog and digital triggering
- Retriggerable measurement tasks
- NI-STC3 timing and synchronization technology
- High-throughput PXI Express bus interface
- NI-DAQmx and LabVIEW compatibility
- 3U, one-slot PXI Express form factor
PXIe-6323 Technical Specifications
| Product Model | PXIe-6323 |
|---|---|
| Part Number | 790591-01 |
| Product Type | PXI Express multifunction I/O module |
| Analog Input Channels | 32 single-ended or 16 differential |
| Analog Input Resolution | 16 bits |
| Maximum Analog Input Rate | 250 kS/s aggregate |
| Analog Input Coupling | DC |
| Analog Input Ranges | ±0.1 V, ±0.2 V, ±0.5 V, ±1 V, ±2 V, ±5 V and ±10 V |
| Analog Output Channels | 4 |
| Analog Output Resolution | 16 bits |
| Maximum Analog Output Rate | 900 kS/s |
| Analog Output Range | ±10 V nominal |
| Digital I/O Lines | 48 total |
| Hardware-Timed Digital Lines | Up to 32 lines on Port 0 |
| Counter/Timers | 4 × 32-bit |
| Timing Accuracy | 50 ppm of sample rate |
| Reference Clocks | 10 MHz and 20 MHz timing resources |
| Bus Interface | PXI Express |
| Module Size | 3U, one-slot |
| Weight | Approximately 198 g |
| Recommended Warm-Up | 15 minutes |
| Recommended Calibration Interval | 2 years |
| Software Driver | NI-DAQmx |
PXIe-6323 Part Number and Accessories
| Item | Part Number | Description |
|---|---|---|
| PXIe-6323 | 790591-01 | 32 AI, 4 AO and 48 DIO multifunction PXI Express module |
| SHC68-68 Cable | 191945-02 | Shielded twisted-pair 68-pin cable for compatible accessories |
| SHC68-68-EPM Cable | 192061-02 | Shielded 68-pin cable with additional noise-reduction construction |
| SCB-68A | 782536-01 | Shielded 68-pin screw-terminal connector block |
Accessory compatibility depends on the connector and signal group being used. Verify the required number of cables, terminal blocks and connector pin assignments before ordering a complete system.
32-Channel Analog Input Architecture
The PXIe-6323 can be configured for 32 referenced or nonreferenced single-ended measurements or 16 differential measurements. Single-ended operation provides the highest channel density, while differential connections offer improved rejection of common-mode interference.
The analog inputs share a multiplexed 16-bit ADC. The 250 kS/s specification is the total scan rate rather than a simultaneous per-channel rate. When multiple channels are enabled, the module scans them sequentially according to the configured channel list.
Software-Selectable Input Ranges
Multiple bipolar input ranges allow the module to measure signals from approximately ±100 mV through ±10 V. Selecting the smallest range that covers the entire signal uses more of the ADC span and improves effective voltage resolution.
The signal source, expected transients and common-mode voltage must remain within the applicable input limits. External attenuation or signal conditioning is required for voltages beyond the module rating.
Four Analog Outputs
The four 16-bit analog outputs can generate DC levels, ramps, periodic waveforms and programmable test stimulus. Hardware-timed operation provides more consistent update intervals than software-timed output commands.
The analog outputs can be coordinated with input acquisition to create stimulus-and-response test sequences. External loads must remain within the voltage and current-drive capabilities of the output circuitry.
48 Digital I/O Lines
The PXIe-6323 provides 48 digital I/O lines for fixture control, device-state monitoring, relay control and communication with digital logic. Up to 32 lines on Port 0 support correlated, hardware-timed digital operations.
Additional PFI lines can carry triggers, clocks, counter signals and static digital I/O. Confirm the required voltage levels and current loading before connecting external logic.
Four 32-Bit Counter/Timers
Four counter/timers support event counting, frequency measurement, period measurement, pulse-width measurement, PWM generation and quadrature encoder acquisition.
Counter tasks can use internal timing signals or external PFI connections. Hardware triggering allows counter measurements to begin in synchronization with analog or digital acquisition.
NI-STC3 Timing and Synchronization
NI-STC3 technology provides independent timing engines and advanced trigger routing. Analog input, analog output, digital input, digital output and counter operations can run as separate hardware-timed tasks.
PXI backplane triggers can synchronize the PXIe-6323 with digitizers, waveform generators, switching modules and other DAQ devices installed in the same chassis.
Typical PXIe-6323 Applications
- Automated functional testing
- Production end-of-line testing
- Multichannel voltage monitoring
- Sensor and transducer acquisition
- Actuator and relay control
- Motor and encoder testing
- Electronic device validation
- Laboratory automation
- Test-fixture control
- Mixed-signal stimulus-and-response testing
NI-DAQmx Software Support
The PXIe-6323 is controlled through NI-DAQmx. The driver provides configuration, acquisition, generation, timing, triggering, scaling, buffering and device-diagnostic functions.
Applications can be created in LabVIEW, LabWindows/CVI, C, C++, C#, .NET and supported Python environments. NI Measurement & Automation Explorer can be used to detect the module, inspect its pinout and run basic test panels.
PXIe-6323 Troubleshooting
The module is not detected in NI MAX
Confirm that the PXIe-6323 is fully inserted in a compatible PXI Express or hybrid slot. Check chassis power, controller communication and NI-DAQmx installation, then refresh the device list.
The analog input rate is lower than expected
The 250 kS/s rating is aggregate across the complete scan list. Reduce the number of channels or lower the requested per-channel rate so the total conversion rate remains within specification.
Analog measurements are noisy
Check grounding, shielding, cable routing and terminal configuration. Differential measurements can improve common-mode noise rejection. Avoid routing low-level input wiring beside switching-power or motor cables.
Channels show ghosting or settling errors
High source impedance and large voltage differences between consecutive channels can reduce settling accuracy. Buffer high-impedance signals, reduce the scan rate or reorder the channel list.
Digital outputs do not change state
Verify the physical-channel name, port direction and task timing. Check whether another NI-DAQmx task has reserved the same digital port or timing resource.
PXIe-6323 vs PXIe-6353
| Feature | PXIe-6323 | PXIe-6353 |
|---|---|---|
| Analog Inputs | 32 SE or 16 differential | 32 SE or 16 differential |
| AI Resolution | 16 bits | 16 bits |
| Maximum AI Rate | 250 kS/s aggregate | 1.25 MS/s single channel |
| Analog Outputs | 4 at up to 900 kS/s | 4 at up to 2.86 MS/s |
| Digital I/O | 48 | 48 |
| Best Suited For | Moderate-speed, cost-effective DAQ | Faster transient and waveform applications |
Frequently Asked Questions
How many analog input channels does the PXIe-6323 provide?
It provides 32 single-ended or 16 differential analog input channels.
Does every channel sample at 250 kS/s?
No. The 250 kS/s specification is an aggregate rate shared by the active channels in the scan list.
Does the PXIe-6323 provide analog outputs?
Yes. It provides four 16-bit analog outputs with update rates up to 900 kS/s.
Can it measure an encoder?
Yes. Its four 32-bit counter/timers support quadrature encoder, frequency, period and pulse measurements.
What is the PXIe-6323 part number?
The current listed part number is 790591-01. Verify the exact ordering configuration when requesting a quotation.
Recommended Related Products
- PXIe-6321 Multifunction I/O Module
- PXIe-6351 High-Speed Multifunction I/O Module
- PXIe-6353 32-Channel Multifunction I/O Module
- PXIe-6383 18-Bit Multifunction I/O Module
- View More NI PXI Modules
Request a Quote for the PXIe-6323
Contact us for current availability, lead time and project pricing for the PXIe-6323 multifunction I/O module. We can also help identify compatible cables, terminal blocks, PXI Express chassis and controllers.
