Here’s a detailed overview of the Allen-Bradley 1746-IB8(C) digital input module from the SLC 500 series:

 Module Overview

• Type: Digital DC input module
• Channels: 8 sinking inputs
• Nominal Voltage: 24V DC
• Voltage Range: 10–30V DC
• Nominal Input Current: 8 mA at 24V DC
• Off-State Current: 1 mA max

 Electrical & Performance Specs

• Backplane Current Draw: 50 mA at 5V DC
• Signal Delay: 8 ms (ON and OFF)
• Power Dissipation: Up to 1.9 W
• Dielectric Withstand: 1500V AC
• Isolation:
  • 500V between communication circuits
  • 1500V between backplane and inputs

 Environmental Ratings

• Operating Temperature: 0–60°C (32–140°F)
• Humidity: 5–95% non-condensing
• Vibration Resistance: 2.5G at 57–500 Hz
• Shock Rating: 30G

 Certifications & Compliance

• Certifications: UL, CE
• Noise Immunity: Meets NEMA ICS 2-230 standards
• Hazardous Location Approval: Class 1, Division 2, Groups A, B, C, D

 Installation & Use

• Compatible I/O Connections: 1746-HT and 1746-HCA
• Step Response: 100 ms in, 2.5 ms out
• Weight: Approx. 0.35 lbs