NI 9401 I/O Module

Description

NI 9401 I/O Module

The NI 9401 is a high-speed, bidirectional digital I/O module from NI (formerly National Instruments) designed for use with CompactDAQ and CompactRIO systems. It is widely recognized for its versatility in high-performance timing and synchronization tasks.

1. Product Description

The NI 9401 is an 8-channel, 100 ns bidirectional digital I/O module. It features ultra-fast response times, making it ideal for applications that require high-speed switching or precise timing. The module is divided into two 4-bit ports; each port can be independently configured for either input or output.

This flexibility allows the NI 9401 to handle various tasks, from simple digital state monitoring to complex encoder interfacing and pulse-width modulation (PWM).

2. Technical Specifications

3. Key Advantages

• High Speed: With a 100 ns response time, it is one of the fastest digital modules in the C Series line, capable of handling high-frequency signals.

• Flexibility: The bidirectional nature means you don’t need separate modules for input and output, saving slot space in your chassis.

• Direct FPGA Access: When used with CompactRIO, the NI 9401 can be accessed directly by the LabVIEW FPGA, allowing for custom hardware-timed logic and sub-microsecond control loops.

• Broad Compatibility: Works seamlessly across both USB/Ethernet CompactDAQ (DAQmx) and RIO (FPGA) platforms.

4. Safety & Precautions

• Current Limits: The module is designed for signal-level logic. Do not attempt to drive high-current loads (like motors or large relays) directly from the pins; use a buffer or an external relay.

• Voltage Levels: Ensure your signals do not exceed 5.25 V. Overvoltage can damage the internal circuitry of the module.

• Hot Swapping: While C Series modules are generally hot-swappable, always ensure the D-SUB connector is securely fastened before powering the system to avoid intermittent signals.

• Grounding: Ensure a common ground between the NI 9401 and the external device to prevent noise and logic errors.

5. Typical Applications

• Quadrature Encoder Interfacing: Reading high-speed position data from motors and actuators.

• Pulse-Width Modulation (PWM): Generating high-frequency PWM signals for motor controllers or LED dimming.

• Event Counting: High-speed pulse counting for flow meters or proximity sensors.

• Digital Communication Protocol Simulation: Implementing SPI, I2C, or custom serial protocols via FPGA.

• High-Speed Triggering: Synchronizing multiple instruments or cameras in a test cell.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Please make an inquiry for more models：