NI 9477 32-Channel Sinking Digital Output Module

The NI 9477 is a 32-channel sinking digital output C Series module for CompactDAQ and CompactRIO systems. It provides industrial-grade logic control with direct connectivity to relays, solenoids, and motors. The sinking output configuration drives the DO pin to COM when activated, allowing current sink from the connected device. Operating across 5 V to 60 V DC with 1,000 Vrms channel-to-earth ground isolation, the module delivers 1 A per channel (20 A module maximum) with 8 μs maximum update rate and 1 μs propagation delay. Channels support parallel operation for higher-current applications up to the 20 A limit. The 37-pin D-SUB connector enables direct integration with industrial control systems across the -40 °C to 70 °C operating range.

– Technical Specifications

• Channels: 32 sinking digital output
• Output Voltage Range: 5 V to 60 V DC
• External Power Supply: 0 V to 60 V DC
• Continuous Output Current: 1 A per channel; 20 A module maximum
• Maximum Update Rate: 8 μs
• Propagation Delay: 1 μs maximum
• Output Impedance: 0.065 Ω maximum
• Channel-to-Earth Ground Isolation: 1,000 Vrms withstand (5 s dielectric test)
• Rated Voltage (Channel-to-Earth): 60 V DC, Measurement Category I
• Power Consumption (Active Mode): 130 mA max from chassis
• Power Consumption (Sleep Mode): 5 μA max
• Thermal Dissipation (70 °C, Active): 1.5 W max
• Thermal Dissipation (70 °C, Sleep): 25 μW max
• Output Glitch: 3 ms to 4 ms during power cycle or software reset
• Power-on State: All channels off
• Operating Temperature: -40 °C to 70 °C
• Storage Temperature: -40 °C to 85 °C
• Operating Humidity: 10% to 90% RH, non-condensing
• Storage Humidity: 5% to 95% RH, non-condensing
• Connector: 37-pin D-SUB
• Weight: 145 g

– Key Features

• Parallel channel wiring for increased current delivery to single loads
• Industrial logic level compatibility
• No reversed-voltage or short-circuit protection
• No channel-to-channel isolation
• Low output impedance for direct actuator control

– Typical Applications

• Industrial relay switching and solenoid control
• Motor activation and control circuits
• Logic-level signal distribution in CompactDAQ/CompactRIO systems
• Multi-channel industrial automation and monitoring

– Compatibility & Integration

The NI 9477 integrates directly into NI CompactDAQ and CompactRIO platforms via standard C Series slots. The 37-pin D-SUB connector provides straightforward wiring to industrial devices operating at industrial logic levels.