The NI 9476 is a 32-channel sourcing digital output module engineered for industrial control systems requiring high-density outputs. It integrates directly into NI CompactRIO and CompactDAQ chassis, delivering up to 250 mA per channel across a 6 V DC to 36 V DC supply range. Each output drives current from Vsup to the digital output pin, enabling direct control of relays, solenoids, motors, and other industrial loads. The module supports hot-swappable operation for maintenance without system shutdown.
Technical Specifications
• Output Channels: 32 digital outputs, sourcing type
• Supply Voltage: 6 V DC to 36 V DC (external power supply required)
• Maximum Output Current: 250 mA per channel (6–30 V DC); 200 mA per channel (30–36 V DC)
• Output Impedance: 0.3 Ω maximum
• Overvoltage Protection: Continuous protection to 40 V DC maximum
• Short-Circuit Protection: Indefinite protection when shorted to COM or to Vsup; typical trip current 3 A per channel
• Channel Isolation: 250 V RMS, CAT II (spring terminal); 1,000 V RMS withstand
• Isolation Type: Channel-to-earth ground only (no channel-to-channel isolation)
– Key Features
• Hot-swappable module design for field replacement without interrupting operation
• Overcurrent and short-circuit protection on all channels; protection status is programmable and monitorable
• Sourcing outputs drive to Vsup when active; compatible with industrial logic levels
• IEC 1131-2 compliant protection against overcurrent, inrush, and short-circuit conditions
• Voltage transient isolation protects connected devices and provides safety separation from earth ground
• Parallel channel operation supported when channels are controlled synchronously to maintain per-channel current limits
– Typical Applications
• Industrial relay and solenoid control
• Motor and pump actuation circuits
• Process automation and machinery control
• Safety interlock systems
• Equipment sequencing and switching applications
– Compatibility & Integration
The NI 9476 operates within NI CompactRIO and CompactDAQ ecosystems, providing modular integration with acquisition, signal conditioning, and real-time processing capabilities. External DC power supplies must be sized to support the module’s voltage and current requirements.
