1791-8AC Allen-Bradley AC I/O Module

Allen-Bradley 1791-8AC AC I/O Module for Remote I/O Systems

Key Technical Specifications

• Brand: Allen‑Bradley
• Model: 1791-8AC
• Product Line: 1791 Block I/O
• Voltage Rating: 120V AC
• Number of Inputs: 8 channels (1 group of 8)
• Number of Outputs: 8 channels
• Input On‑State Range: 79‑132V AC
• Input On‑State Current: 5 mA minimum at 79V AC
• Input Off‑State Voltage: 35V AC maximum
• Output Voltage Range: 20‑132V AC
• Output Current (Vertical Mount): 300‑600 mA (30‑60°C)
• Output Current (Horizontal Mount): 150‑300 mA (30‑60°C)
• External Power: 85‑132V AC, 150 mA
• Isolation Voltage: 500V AC (tested at 1250V AC)
• Dimensions: 6.95" x 2.7" x 3.85" (176.5 x 68.8 x 98 mm)
• Weight: 0.94 lbs (0.43 kg)

Electrical & Performance Details

• Each output handles a surge current of 10A for 50ms, recurring every 2 seconds.
• The minimum on‑state output current per channel is 50 mA.
• Outputs have a maximum voltage drop of 1.5V at 300 mA.
• Off‑state leakage current is limited to 3 mA maximum.
• Output response time is 1/2 cycle OFF to ON and 8.3 ms ON to OFF at 60 Hz.
• Maximum power dissipation is 12.9 Watts (43.99 BTU/hour).

Frequently Asked Questions (FAQ)

• Q: What is the main function of this module?
  A: The 1791-8AC acts as a Remote I/O adapter, providing 8 AC inputs and 8 AC outputs for distributed systems.
• 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) platforms.
• Q: What is the operating voltage range for the inputs?
  A: Inputs recognize an on‑state between 79 and 132 volts AC.
• Q: How many output groups does it have?
  A: All 8 outputs are in one group, controlled together via the RIO network.
• 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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