Product Short Description
Product Name
C Series Solid-State Relay Output Module
Product Introduction
The NI 9485 is an 8-channel solid-state relay (SSR) digital output module from the National Instruments C Series platform. It provides reliable switching of DC and AC loads with no moving parts, suitable for industrial control and automation applications requiring long service life and fast switching.
Description
Technical Specifications
- Number of Output Channels: 8
- Relay Type: Solid-State Relay (SSR)
- Maximum Switching Voltage: 60 V DC, 30 V RMS
- Switching Current: 1.2 A per channel (4 channels active); 750 mA per channel (all 8 channels active)
- Isolation: 60 V DC channel-to-channel isolation
- Power Consumption: 500 mW maximum (active mode), 5 mW maximum (sleep mode)
- Connector Type: Screw terminal
- Operating Temperature: -40°C to 70°C
- Weight: 145 g
Functional Features
- Fast switching speed with typical 0.5 ms turn-on/turn-off time
- No contact bounce for clean switching of sensitive loads
- Built-in overcurrent and overvoltage protection
- Sourcing or sinking output configuration
- Compatible with CompactDAQ and CompactRIO systems
Application Scenarios
- Industrial actuator and solenoid control
- DC motor start/stop and speed control
- Signal switching and routing in test systems
- Low-power AC load switching
- Automated production line logic control
Structural Characteristics
- Compact C Series form factor
- Screw terminal interface for reliable field wiring
- Solid-state construction with no mechanical wear parts
- Conformal coating for environmental protection
- Channel status indicators for visual diagnostics
Working Principle
When a logic high signal is received from the control system, the internal SSR drive circuit activates the optocoupler, which triggers the power semiconductor switch to conduct current to the load. When the control signal is low, the semiconductor switch turns off, interrupting load current. The optical isolation provides electrical separation between control and load circuits.
Installation Requirements
- Install in any C Series chassis slot
- Use 0.05 mm² to 1.5 mm² (30 AWG to 14 AWG) copper wire
- Strip 6 mm of insulation from wire ends before termination
- Torque screw terminals to 0.22–0.25 N·m
- Ensure load voltage and current are within module ratings
Usage Notes
- Do not switch loads exceeding the maximum voltage and current ratings
- Ensure proper heat dissipation when operating multiple channels at full current
- Use surge suppression for inductive loads
- Do not connect the module to mains voltage circuits
- Verify output polarity before connecting DC loads
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