Allen-Bradley 1791-8AR Relay I/O Module

Allen-Bradley 1791-8AR AC Input & Relay Output Module

Key Technical Specifications

• Brand: Allen‑Bradley
• Model: 1791-8AR
• Product Line: 1791 Block I/O
• Input Voltage: 120V AC
• Number of Inputs: 8 channels (1 group of 8)
• Input On‑State Range: 79‑132V AC
• Input On‑State Current: 12.3 mA maximum at 132V AC
• Input Off‑State Voltage: 35V AC maximum
• Output Type: Relay (8 channels)
• Output Ratings: 125V DC at 1A resistive max; 20‑30V DC at 1A max; 125V AC at 0.2A max
• External Power: 85‑132V AC, 150 mA
• Power Dissipation: 12.9 Watts maximum
• Thermal Dissipation: 56.1 BTU/hour maximum
• Weight: 1.00 lbs (0.45 kg)

Frequently Asked Questions (FAQ)

• Q: What makes this module different from other 1791 modules?
  A: The 1791-8AR uniquely combines eight 120VAC inputs with eight relay outputs for switching both AC and DC loads.
• Q: What controllers are compatible with this module?
  A: It works with PLC‑2, PLC‑3, PLC‑5, and SLC 500 (with 1747‑SN scanner) controllers.
• Q: What types of loads can the relay outputs control?
  A: The relays can switch resistive and inductive loads including lights, solenoids, and contactor coils.
• Q: What is the maximum cable length for the RIO network?
  A: Up to 10,000 feet at 57.6K baud, with shorter distances at higher baud rates.
• Q: What is your shipping and return policy?
  A: We ship within 5 days via major carriers and offer a 30‑day return policy.

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