NI sbRIO-9612 Single Board Controller

NI sbRIO-9612 Single Board RIO Controller: Embedded Measurement and Control Core for OEM

In the field of embedded industrial control, OEM manufacturers often need to seek the best balance between performance, cost, size, and reliability. The sbRIO-96xx series single board RIO (Single Board Reconfigure I/O) controller launched by National Instruments is a solution designed to meet the needs of large-scale, highly integrated embedded applications. Among them, sbRIO-9612, as the mid to high end model of this series, integrates real-time processors, reconfigurable FPGAs, and rich onboard I/O, and supports C-series module expansion, providing a powerful embedded platform for OEMs in the fields of machine manufacturing, energy management, medical equipment, and transportation. This article will provide a comprehensive and in-depth technical analysis of sbRIO-9612 from the aspects of hardware architecture, technical specifications, software development, power and environmental adaptability, and OEM integration points.

Product positioning and series overview

The NI sbRIO-96xx series is an embedded control and acquisition device designed specifically for high-capacity OEM applications, integrating real-time controllers, reconfigurable FPGAs, and multiple I/Os on a compact single board. The entire series is divided into multiple models based on processor speed, FPGA capacity, and onboard I/O type, covering various requirements from basic logic control to high-speed closed-loop control.

The specific positioning of sbRIO-9612 is as follows:

Processor: Freescale MPC5200 real-time processor, with a clock speed of 400 MHz, running VxWorks real-time operating system.

FPGA：Xilinx Spartan-3， Contains 46080 logical units (approximately 2M gates) and 720 kb embedded RAM.

Onboard I/O: 110 channels of 3.3 V bidirectional digital I/O, 32 channels of single ended/16 channels of differential analog input (16 bit resolution, 250 kS/s total sampling rate), 4 channels of analog output (± 10 V, 16 bits).

Industrial I/O: sbRIO-9612 itself does not come with 24V industrial I/O. If you need 24V digital input/output, you can choose the sbRIO-964x series (with 32 24V inputs and 32 24V outputs).

Scalability: Three connectors are used to add onboard versions of C-series I/O modules (NI or third-party customization).

Size: 8.2 inches x 5.6 inches (approximately 208 mm x 142 mm), longer than sbRIO-960x to accommodate more onboard I/O.

Compared to sbRIO-9611, sbRIO-9612 has a larger FPGA (2M gates vs 1M gates), making it suitable for scenarios that require complex FPGA logic or high-speed signal processing.

Deep analysis of hardware architecture

1. Real time processor subsystem

SbRIO-9612 uses the Freescale MPC5200 processor, which is an industrial grade embedded processor based on the PowerPC architecture with a clock speed of up to 400 MHz. The processor communicates with FPGA through a high-speed internal PCI bus to achieve low latency data exchange between the real-time processor and programmable hardware.

Memory: 128 MB DRAM (for real-time application running), 256 MB non-volatile storage (for program and data storage).

Operating system: Wind River VxWorks RTOS, known for its high reliability and deterministic real-time response.

Communication interface: one 10/100BASE-TX Ethernet port (supporting automatic negotiation), one RS232 serial port. The Ethernet port is equipped with built-in FTP server, HTTP server, and LabVIEW remote panel web server, which facilitates remote monitoring and file transfer.

2. FPGA subsystem

FPGA is the core of sbRIO-9612 for implementing flexible hardware customization. The Xilinx Spartan-3 XC3S2000 (corresponding to 2M doors) has:

Logical units: 46080, can be used to implement custom digital logic, PWM generator, encoder counter, communication protocol parsing, etc.

Embedded RAM: 720 kb, used for FIFO, lookup tables, or small-scale data caching.

Direct connection with I/O: All onboard 3.3V DIOs, analog inputs, and analog outputs are directly connected to the FPGA's I/O pins, enabling high-speed closed-loop control without the need for a processor.

This architecture enables sbRIO-9612 to perform two types of tasks simultaneously:

Deterministic real-time control: The LabVIEW Real Time application is run by a processor to handle network communication, data recording, user interface, and more.

High speed/hardware timing tasks: executed by FPGA, such as sampling digital signals at a rate of 1 MHz, generating accurate PWM waveforms, implementing hardware triggering, etc.

3. Detailed specifications of onboard I/O

3.3 V digital I/O (110 channels)

All 110 digital lines are bidirectional and can be configured as inputs or outputs through software or FPGA.

Output characteristics: High level minimum 2.7 V (typical 3.3 V), low level maximum 0.54 V (typical 0.07 V).

Input characteristics: High level minimum 2.0 V (maximum 5.25 V), low level maximum 0.8 V.

Maximum current per channel: 3 mA (source current or sink current). Therefore, these DIOs are suitable for driving LEDs, small signal relays, or other 3.3 V/5 V logic interfaces, but are not suitable for directly driving high-power loads.

Analog input (32 single ended/16 differential)

ADC resolution: 16 bits.

Conversion time: 4 μ s (corresponding to a total sampling rate of 250 kS/s, i.e. all channels share this throughput).

Input range: Programmable selection of ± 10 V, ± 5 V, ± 1 V, ± 0.2 V.

Input type: Single ended or differential (configured through software). Differential mode can improve the common mode noise suppression capability.

Analog output (4 channels)

DAC resolution: 16 bits.

Update time: 3 μ s (single channel, multi-channel requires timed updates).

Output range: ± 10 V.

Application scenarios: Can be used to control servo drives, proportional valves, or as an excitation source.

C-series expansion connectors (3 pieces)

Each connector can connect to an onboard version of the C-series I/O module (such as NI 9201 analog input, NI 9401 digital I/O, etc.).

This allows sbRIO-9612 to easily expand more I/O types, such as thermocouple input, strain gauge input, high-voltage digital input, etc.

4. Power supply and power consumption

Power supply voltage range: 19 V to 30 V DC, single power input.

Power consumption (without external load): The typical value of sbRIO-961x is 7.50 W. The actual power consumption depends on the FPGA logic complexity and I/O load.

Internal power conversion: The onboard DC-DC converter provides various voltages required for the processor, FPGA, and I/O.

5. Environmental specifications

Working temperature: -20 ° C to 55 ° C (to be installed inside the casing and comply with IEC 60068-2-1/2-2).

Storage temperature: -40 ° C to 85 ° C.

Working humidity: 10% to 90% RH, no condensation.

Maximum altitude: 2000 meters.

Pollution level: 2 (only non-conductive pollution, occasionally conductive due to condensation).

Safe voltage: Maximum 35 V between V - and C terminals, measurement category I. Cannot be directly connected to mains or CAT II/III/IV circuits.

Important compliance statement: NI declares that sbRIO-9612 itself has not undergone product safety, EMC, or CE mark compliance certification. The final product supplier (i.e. OEM integrator) is responsible for integrating sbRIO into the complete system, ensuring that the entire system complies with all applicable regulations and standards. This means that users need to conduct system level EMC testing and security certification on their own.

Software Development and Programming Model

SbRIO-9612 is fully integrated into the NI LabVIEW ecosystem and uses graphical programming to significantly reduce the threshold for embedded system development.

1. LabVIEW Real Time module

The real-time processor runs VxWorks RTOS and is programmed using the LabVIEW Real Time module. Developers can:

Create deterministic loops (such as 1 kHz control loops).

Communicate with the upper computer via Ethernet (TCP/IP, UDP, Modbus/TCP).

Use the built-in web server to publish remote panels and achieve browser based monitoring.

Call the external C code library and reuse existing algorithms.

2. LabVIEW FPGA module

The FPGA part is programmed using LabVIEW FPGA modules, without the need to learn VHDL/Verilog. Developers can:

Design high-speed digital logic through graphical data flow.

Implement custom communication protocols (such as SPI, I ² C, parallel bus).

Create a hardware timing control loop with a cycle of up to 40 MHz (25 ns).

Efficiently transfer data between FPGA and real-time processor using DMA FIFO or Interrupt (IRQ).

Reuse existing HDL code (through IP integration nodes).

3. NI-RIO driver software

The unified NI-RIO driver provides an API for FPGA interface, supporting programming and communication of FPGA from LabVIEW Real Time or Windows host.

4. Develop workflow

The typical development process is as follows:

Develop FPGA logic using LabVIEW FPGA module on the host computer (Windows PC).

Compile FPGA code (generate bitstream).

Develop real-time control programs in the LabVIEW Real Time module and call FPGA interfaces.

Deploy real-time programs to sbRIO-9612 via the network and download FPGA bitstreams simultaneously.

The program runs independently and supports self starting when powered on.

OEM integration and bulk supply

The positioning of sbRIO-9612 is for large-scale OEM applications, so its sales model is different from standard shelf products:

Minimum order quantity: 100 pieces or higher volumes only.

OEM pricing: Provide highly competitive discounts for high-capacity customers. Please contact NI sales for specific prices.

Customization options: NI provides design consulting and product integration assistance to help OEM customers optimize costs and dimensions.

For integrators, the board level design of sbRIO-9612 allows for direct integration into larger electronic systems rather than being used as a standalone device. Its compact size (8.2 "x 5.6") and single 19-30 V power supply greatly simplify system integration. Three C-series expansion slots provide flexibility for future feature upgrades.

Typical application areas

Based on the architecture characteristics of sbRIO-9612, its typical applications include:

Industrial machine control: Using 110 channels of DIO to connect sensors, encoders, buttons, and indicator lights, combined with FPGA to achieve high-speed position capture and PWM motor control.

Energy management: 32 analog inputs can simultaneously monitor multiphase voltage and current to achieve power analysis. Four analog outputs are used to control inverters or adjustable power supplies.

Medical equipment: High reliability VxWorks system and FPGA deterministic response, suitable for infusion pumps, diagnostic instruments, etc.

Transportation: Train data recording, onboard status monitoring, wide temperature range, and anti vibration design (to be verified by oneself) suitable for onboard applications.

Research instruments: Utilizing FPGA to achieve custom signal generation and acquisition, such as laser control, particle counters, etc.

Comparison and selection with sbRIO-9611

The onboard I/O quantity and type of sbRIO-9611 and sbRIO-9612 are exactly the same, with the only difference being the FPGA size:

9611:1M gate (17280 logic units), 432 kb RAM.

9612:2M gate (46080 logic unit), 720 kb RAM.

Suggestion for selection:

If the application requires a large number of parallel PID loops, high-speed digital communication protocols (such as custom SPI slaves), image preprocessing, and other complex logic, 9612 should be selected.

If FPGA is only used for simple I/O expansion, PWM generation, and a small number of counters, 9611 is sufficient and cost-effective.

Hardware installation and maintenance precautions

Cleaning: Use a dry cloth to wipe and prevent liquids from entering.

Terminal torque: J3 screw terminal torque is 0.5 to 0.6 N · m (4.4 to 5.3 lb · in.), over tightening may damage the terminal.

Shell requirements: sbRIO-9612 must be installed in a suitable shell to meet safety regulations and EMC requirements. The final system needs to pass relevant certifications.

Grounding: It is recommended to connect the "C" terminal (common ground) of the board to the system chassis ground to reduce common mode noise.

Disposal of discarded electronic devices

SbRIO-9612 complies with the requirements of the EU WEEE Directive. At the end of its lifecycle, it must be sent to a dedicated WEEE recycling center and cannot be treated as ordinary household waste.