A-B 1791-16AC Remote I O Module

Allen-Bradley 1791-16AC Remote I/O Module (Block I/O)

The Allen-Bradley 1791-16AC is a Remote I/O Block Module that combines 16 digital AC inputs and 16 digital AC outputs into a single compact unit. It features a built-in Remote I/O adapter, power supply, and signal conditioning circuitry, making it ideal for distributed control systems and remote I/O architectures.

Key Specifications

• Model: 1791-16AC
• Brand: Allen-Bradley (Rockwell Automation)
• Series: 1791 Block I/O
• Product Type: Remote I/O Block Module
• Inputs:
  • 16 × 120 VAC digital inputs
• Outputs:
  • 16 × 120 VAC digital outputs
• Input Voltage Range:
  • 79–132 VAC
• Output Voltage Range:
  • 20–132 VAC
• External Power Supply:
  • 85–132 VAC, 47–63 Hz
• Communication:
  • Allen-Bradley Remote I/O (RIO)
• Mounting:
  • Horizontal or vertical installation
• Status:
  • Discontinued / Obsolete

What it does (simple explanation)

Field Devices (Switches / Sensors)
↓
1791-16AC Block I/O
↓
Remote I/O Network (RIO)
↓
PLC Controller

The module collects field input signals and controls output devices while communicating with the PLC through the Remote I/O network. It reduces wiring and cabinet space by integrating I/O, power supply, and communication functions into one unit.

Main Features

• Integrated Remote I/O adapter
• 16 inputs and 16 outputs in one module
• Built-in power supply
• Supports daisy-chain Remote I/O topology
• High isolation protection between I/O groups
• Compact design for distributed installations
• Compatible with legacy PLC-5 and SLC Remote I/O systems

Applications

• Factory automation systems
• Conveyor systems
• Material handling equipment
• Packaging machinery
• Process control systems
• Remote machine I/O stations