NI-9145

The NI-9145 is a rugged 8-slot EtherCAT CompactRIO expansion chassis designed for distributed industrial measurement, deterministic control, and high-channel-count remote I/O systems. It acts as an EtherCAT slave chassis, allowing engineers to expand CompactRIO, PXI, or industrial controller systems with distributed C Series I/O modules over Ethernet.

Unlike standard CompactRIO controllers such as the cRIO-9057 or cRIO-9067, the NI-9145 does not operate as a standalone real-time controller. Instead, it functions as a deterministic EtherCAT expansion node managed by an external EtherCAT master controller.

Typical applications include:

• Distributed industrial I/O
• Remote EtherCAT measurement systems
• Machine condition monitoring
• High-channel-count automation systems
• Distributed motion and control systems
• Industrial test systems
• Smart factory synchronization
• Deterministic remote acquisition

EtherCAT Distributed Architecture

The NI-9145 is designed around an EtherCAT deterministic Ethernet architecture.

Key network specifications include:

• 100BaseTX Ethernet
• EtherCAT compatibility
• 100 Mbps communication rate
• Maximum cabling distance: 100 m per segment
• Daisy-chain distributed topology support

One of the major advantages of the NI-9145 is the ability to daisy-chain multiple expansion chassis from a single master controller while maintaining deterministic timing and minimizing processor overhead on the host system.

This architecture is particularly useful for:

• Large industrial machines
• Distributed factory systems
• Remote acquisition nodes
• Long-distance industrial I/O deployment
• Synchronized multi-node systems

Compared with centralized control systems, EtherCAT expansion reduces wiring complexity and improves scalability.

FPGA Architecture and Inline Processing

The NI-9145 includes an onboard Xilinx Zynq-7000 XC7Z020 FPGA, allowing deterministic inline processing and FPGA-based I/O control.

FPGA resources include:

• 85,000 logic cells
• 106,400 flip-flops
• 53,200 LUTs
• 220 DSP slices
• 4,480 kbits block RAM

Engineers can use:

• Scan Mode for rapid distributed I/O deployment
• FPGA Mode for custom timing and processing
• High-speed signal handling
• Deterministic triggering
• Encoder synchronization
• Inline industrial processing

Compared with simpler EtherCAT remote I/O systems, the NI-9145 provides significantly greater flexibility because engineers can directly program the onboard FPGA.

C Series Modular Expansion

The NI-9145 supports up to 8 NI C Series modules, enabling flexible distributed industrial measurement and control systems.

Supported module categories include:

• Analog input/output
• Digital I/O
• Temperature measurement
• Strain and bridge measurement
• Vibration and IEPE acquisition
• CAN communication
• Motion interfaces
• Industrial communication modules

Because each slot maintains its own object dictionary access through EtherCAT vendor extensions, the NI-9145 supports advanced remote module configuration and deterministic communication handling.

This makes it especially suitable for distributed industrial systems requiring mixed signal acquisition and synchronized remote control.

Real-Time Determinism and Synchronization

The NI-9145 supports:

• EtherCAT Distributed Clock (DC)
• Free-run timing mode
• Synchronized timing mode
• Deterministic conversion cycles

In synchronized mode, each acquisition cycle is triggered directly by the EtherCAT master controller, ensuring deterministic system-wide timing.

This capability is important for:

• Motion control systems
• Synchronized acquisition
• Distributed machine monitoring
• Industrial robotics
• High-speed automation
• Coordinated industrial processes

Compared with conventional Ethernet remote I/O, EtherCAT provides substantially lower jitter and better deterministic timing performance.

Rugged Industrial Design

The NI-9145 is designed for industrial embedded deployment and harsh environments.

Industrial specifications include:

• Operating temperature: -40 °C to 70 °C
• Storage temperature: -40 °C to 85 °C
• IP40 protection
• Random vibration: 5 g RMS
• Shock resistance up to 50 g
• Maximum altitude: 5,000 m

The chassis supports:

• DIN-rail mounting
• Panel mounting
• Rack mounting
• Desktop installation

These features make the NI-9145 suitable for:

• Factory automation
• Transportation systems
• Outdoor industrial systems
• Energy infrastructure
• Remote monitoring stations
• Embedded machine platforms

Application-Oriented Use Cases

Distributed Machine Monitoring

The NI-9145 can deploy vibration, temperature, and analog acquisition modules close to industrial equipment while maintaining synchronized communication with a central CompactRIO or PXI controller.

Large-Scale Industrial Automation

Multiple NI-9145 chassis can be daisy-chained to create large distributed I/O systems with deterministic synchronization.

Motion and Robotics Systems

The EtherCAT distributed clock architecture supports coordinated industrial motion systems and synchronized machine operation.

Industrial Test Platforms

The chassis is suitable for remote measurement and distributed automated testing systems requiring deterministic acquisition timing.

Comparison with Similar Models

Compared with the NI-9144, the NI-9145 introduces a more advanced Zynq FPGA architecture and improved processing capability. Compared with standalone CompactRIO controllers like the cRIO-9067 or cRIO-9057, the NI-9145 is optimized specifically for EtherCAT distributed expansion rather than standalone embedded control. Compared with the cRIO-9805, the NI-9145 focuses on distributed EtherCAT I/O expansion instead of TSN Ethernet switching.

Conclusion

The NI-9145 is a rugged 8-slot EtherCAT CompactRIO expansion chassis designed for deterministic distributed industrial I/O and synchronized measurement systems.

Its combination of:

• EtherCAT deterministic networking
• Zynq-7020 FPGA processing
• 8-slot C Series expansion
• Distributed clock synchronization
• Rugged industrial construction
• FPGA-based inline processing

makes it an excellent solution for distributed machine monitoring, synchronized industrial automation, remote measurement systems, and large-scale industrial control architectures.