Simplify Distributed I/O with the Allen-Bradley 1791-16A0

Core Technical Specifications

• Brand & Manufacturer: Allen-Bradley
• Model & Series: 1791-16A0, part of the 1791 Block I/O family
• Product Category: Discrete Input Module, Block I/O
• Input Channels: Sixteen (16) 120V AC inputs
• Channel Configuration: Organized into 2 independent groups of 8 inputs
• On-State Input Voltage Range: 79 to 132 VAC, 47-63 Hz
• External Power Supply Requirement: 85 to 132 VAC, 47-63 Hz
• External Supply Current: 150 mA typical
• Input ON-State Current: 5 mA minimum at 79V
• Input OFF-State Voltage (Max): 35 VAC
• Operating Temperature Range: Up to 60°C (140°F)
• Mounting Orientation: Vertical or Horizontal
• Unit Weight: 1.25 lbs (0.57 kg)

Key Performance & Integration Features

• Functions as a complete distributed I/O node with embedded power supply and PLC interface.
• Designed for direct connection to common field devices like limit switches, pushbuttons, and proximity sensors.
• Supports daisy-chain network configuration back to a central controller or scanner.
• Offers a maximum surge current rating of 10A for 50ms (repeatable every 2 seconds).
• Provides a maximum output rating of 600mA at 30°C, derating to 300mA at 60°C.
• The 1791-16A0 ensures reliable operation in space-constrained panels with flexible mounting.

Installation & Compatibility Guidelines

• Ensure at least 2 inches (5.08 cm) of clearance on all sides for proper ventilation.
• Connect compatible 120VAC field instruments to the 16 input channels.
• This input-only module has 0 outputs; pair it with an output module for complete control.
• For use with 1771 series output modules, verify compatibility regarding OFF-state leakage and ON-state voltage.

Frequently Asked Questions (FAQ)

• Q: How many input channels does this module have?
  A: The 1791-16A0 provides 16 discrete 120VAC input channels.
• Q: Can it be mounted in any orientation?
  A: Yes, it supports both vertical and horizontal mounting for layout flexibility.
• Q: What is the operating voltage range?
  A> The input on-state range is 79-132VAC, and it requires an external power supply of 85-132VAC.
• Q: What devices can connect to these inputs?
  A> It is compatible with standard 120VAC devices like limit switches, pushbuttons, float switches, and selector switches.

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