Allen-Bradley 1791-16AC Block I/O Module

Allen-Bradley 1791-16AC 32-Point AC Input/Output Block I/O Module

Key Technical Specifications

• Brand: Allen-Bradley
• Model: 1791-16AC
• Product Line: 1791 Block I/O Series
• Input Channels: 16 points (2 groups of 8)
• Output Channels: 16 points (2 groups of 8)
• I/O Type: 120V AC
• Input On-State Voltage Range: 79 to 132V AC, 47-63 Hz
• Nominal Input Current: 11 mA
• Output Voltage Range: 20 to 132V AC
• External Power Supply: 85-132V AC, 47-63 Hz, 150 mA @ 132VAC
• Input Response Time: 1.0ms (OFF to ON), 26ms (ON to OFF)
• Output Response Time: 1.0ms (OFF to ON), 8.3ms @ 60Hz / 10.0ms @ 50Hz (ON to OFF)
• Maximum Power Dissipation: 31.3 Watts

Mounting & Output Current Ratings

• The 1791-16AC supports flexible vertical or horizontal mounting in your control panel.
• Output Current (Vertical Mount): 600mA per point at 30°C and 300mA at 60°C.
• Output Current (Horizontal Mount): 300mA per point at 30°C and 150mA at 60°C.
• Vertical mounting provides better cooling, allowing for higher continuous output current ratings.
• Always ensure adequate ventilation space around the module for optimal thermal performance.

Installation & Compatibility

• This module functions as a complete Remote I/O adapter with an integrated communication interface and power supply.
• It connects to a main controller via a daisy-chain topology using the Universal Remote I/O protocol.
• Compatible Input Devices: Proximity switches, limit switches, pushbuttons, float switches, and other contact closures.
• Compatible Output Loads: Pilot lights, relay coils, solenoids, alarms (horns/buzzers), and other AC devices.
• The module provides robust isolation: 500V AC (Power to RIO) and 1250V AC (between I/O groups and logic).

Packaging & Shipping

• Every 1791-16AC module is supplied as a brand new, original unit from Allen-Bradley.
• We pack all items securely to guarantee they arrive in perfect condition.
• We ship worldwide using reliable express carriers including DHL, FedEx, and UPS.

Frequently Asked Questions (FAQ)

• Q: Is this a combined input and output module?
  A: Yes. The 1791-16AC uniquely provides 16 AC input points and 16 AC output points in one block.
• Q: Why does the output current rating change with mounting?
  A: Current rating depends on cooling. Vertical mounting allows better heat dissipation, supporting higher current (e.g., 600mA at 30°C) than horizontal mounting.
• Q: What is the operating voltage range?
  A: Inputs operate from 79-132V AC. Outputs can switch loads from 20-132V AC. The external supply is 85-132V AC.
• Q: Do you have stock available?
  A: Yes, we maintain stock of the 1791-16AC for prompt shipment.
• Q: What is your shipping and return policy?
  A: We ship within 5 business days and offer a 30-day return policy for unused items in original packaging.
• Q: Can this module be used in a Remote I/O network?
  A: Absolutely. The 1791-16AC is specifically designed as a Remote I/O block adapter for distributed control architectures.

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