Allen-Bradley 1791-8BR: Compact Hybrid DC Input & Relay Output Module

Key Product Specifications

• Brand & Model: Allen-Bradley 1791-8BR
• Input Channels: 8 points, 24VDC Sinking type.
• Input Voltage Range: 10 to 30 Volts DC.
• Output Channels: 8 Form A (Normally Open) Relay Contacts.
• Output Ratings: 1A @ 30VDC, 1A @ 132VAC resistive.
• External Power: 19.2–30 VDC, 300 mA typical.
• Surge Current: Requires external fuse protection.
• Communication: Remote I/O (RIO) Protocol.
• Mounting: Vertical or Horizontal DIN Rail.
• Wire Size: 14 AWG stranded maximum.

Technical Support FAQ

• Q: What does "dry contact" output mean?
  A: It means the relay output has no internal voltage. You supply the AC or DC power to the switched load yourself.
• Q: Can I connect an AC motor starter directly to this module?
  A: Yes, but you must use an external fuse. The relay can switch the coil, but it needs circuit protection.
• Q: How many of these modules can I put on one RIO cable?
  A: The RIO network supports many devices. The limit depends on the scanner module's total I/O capacity.
• Q: What is the operating temperature range?
  A: The 1791-8BR operates in standard industrial temperatures, typically 0 to 60°C.
• Q: Do I need a special cable for the RIO network?
  A: Yes, use Belden 9463 or equivalent twinaxial cable for reliable communication.

© 2025 Ubest Automation Limited. https://www.ubestplc.com/ All rights reserved.
Contact: sales@ubestplc.com Phone: +86 180 3000 5825