The NI 9474 is an 8-channel C-Series sourcing digital output module for industrial automation and control systems. It operates across 5 VDC to 30 VDC supply ranges and delivers up to 1.0 A per channel with a 1 µs maximum update rate. The module mounts directly into NI CompactDAQ or CompactRIO chassis without modification, providing platform flexibility for distributed I/O architectures. Screw terminal connectivity accommodates 26 AWG to 14 AWG copper conductors, enabling direct interfacing with motors, actuators, relays, and other industrial loads. Internal flyback diodes eliminate external protection components when driving inductive loads. Transient overvoltage protection rated at 2,300 Vrms between output channels and backplane ensures reliability in harsh electrical environments.
Technical Specifications
• Channels: 8 sourcing digital output channels
• Form Factor: C-Series module
• Voltage Range: 5 VDC to 30 VDC
• Output Current: 1.0 A per channel (channels may be paralleled to increase current)
• Output Impedance: 0.07 Ω to 0.13 Ω
• Update Rate: 1 µs maximum
• Output Delay (Full Load): 1 µs maximum
• Transient Overvoltage Protection: 2,300 Vrms (output channels to backplane/earth)
• Channel-to-Earth Isolation: 250 Vrms, CAT II
• Short-Circuit Protection: 14 A per channel threshold
• MTBF: 479,889 hours at 25 °C (Bellcore Issue 2, Method 1, Case 3)
• Power-On State: Channels off
• Internal Protection: Flyback diodes included
– Key Features
• Screw terminal connectors with 10-position layout
• Wire gauge acceptance: 0.2 mm² to 2.5 mm²
• Screw torque specification: 0.5 N·m to 0.6 N·m
• Channel status indication via onboard LEDs
• 90 °C minimum wire temperature rating
– Typical Applications
• Industrial motor control
• Relay switching
• Actuator command signals
• High-speed industrial automation
• Distributed control systems
– Compatibility & Integration
The NI 9474 integrates with NI CompactDAQ and CompactRIO platforms. Optional NI 9927 Backshell Connector Kit required for installation.
