PXIe-8240

The PXIe-8240 is a high-performance MXI-Express (PCIe extension) controller developed by National Instruments for connecting external PCs to PXI Express chassis.

Instead of using an embedded PXI controller like the PXIe-8880, the PXIe-8240 allows engineers to use a desktop or workstation as the system controller while maintaining direct PCIe communication with the PXI chassis.

This makes it ideal for users who need higher CPU performance, GPU integration, or flexible workstation deployment.

Typical applications include:

• Automated test equipment (ATE)
• High-speed data acquisition
• RF validation
• Semiconductor testing
• GPU-accelerated measurement systems
• Machine vision
• Large storage systems
• Modular industrial testing

MXI-Express Architecture

The PXIe-8240 works as a remote control interface between the host PC and PXI chassis.

Key specifications:

This architecture makes remote PXI systems behave like local PCIe devices.

External PC Control Advantage

The biggest advantage of the PXIe-8240 is controller flexibility.

Benefits:

Higher CPU Performance

Use modern workstation CPUs instead of embedded controllers.

GPU Integration

Ideal for AI, image processing, and large DSP workloads.

Larger Storage

Use NVMe arrays and large local storage.

Easier Upgrades

Upgrade host PC without replacing PXI hardware.

Applications:

• AI-based test systems
• Real-time signal processing
• Machine learning workflows
• High-speed logging systems

Compared with embedded controllers, this architecture is much more scalable.

High-Speed Data Transfer

The PXIe-8240 uses PCIe extension technology.

Advantages:

Low Latency

Important for fast measurement systems.

Direct PCIe Mapping

Modules appear directly in the host system.

High Throughput

Supports large streaming data applications.

Deterministic Performance

Useful in synchronized test systems.

Ideal for:

• High-speed digitizers
• RF signal transceivers
• FlexRIO FPGA modules
• Image acquisition cards

This makes it suitable for bandwidth-intensive systems.

Multi-Chassis Expansion

The PXIe-8240 supports large PXI systems.

Benefits:

Chassis Scaling

Expand test systems beyond a single chassis.

Large Modular Architectures

Add more instrumentation as needed.

Centralized Control

Control multiple PXI chassis from one host.

Unified Software Management

Simplify system integration.

Applications:

• Semiconductor ATE
• Large RF test racks
• Multi-channel DAQ systems
• Massive switching systems

This is important for enterprise-scale test systems.

RF and FPGA Applications

The PXIe-8240 is commonly used with:

• PXIe-5841
• PXIe-5170R
• PXIe-7915
• High-speed digitizers
• RF analyzers

Why?

Because these modules generate large data volumes requiring workstation-class compute resources.

Common use cases:

5G Validation

High-bandwidth RF streaming.

Radar Systems

Real-time FPGA processing.

AI Signal Analysis

GPU-accelerated RF classification.

Semiconductor Testing

Large-scale waveform capture.

Software Integration

The PXIe-8240 supports:

• NI MAX
• PXI Platform Services
• LabVIEW
• TestStand
• Python
• C/C++

Benefits:

• Easy system detection
• Direct hardware access
• High-speed test automation
• Large-scale modular control

This simplifies deployment.

Comparison with Similar NI Controllers

Compared with the PXIe-8880, the PXIe-8240 offers much more flexibility by using an external workstation. Compared with the PXIe-8381, it is older but still widely used for stable remote PXI control.

Why Engineers Choose PXIe-8240

Engineers choose the PXIe-8240 for:

• External workstation control
• High CPU/GPU integration
• Better storage options
• Flexible upgrades
• Multi-chassis expansion
• High-speed RF streaming
• Large automated test systems

It is a strong choice when embedded PXI controllers are not powerful enough.

Conclusion

The PXIe-8240 is a powerful MXI-Express controller that extends PXI systems into workstation-class computing environments.

Its combination of:

• PCIe extension architecture
• High-speed data transfer
• External PC flexibility
• Multi-chassis scalability
• Low latency
• GPU integration potential
• Strong NI ecosystem compatibility

makes it an excellent solution for RF validation, FPGA systems, semiconductor testing, AI-based measurement, and large-scale automated test environments.