Rockwell 1791-16AC Series B Block I/O 32-Point 60Hz

Allen-Bradley 1791-16AC Series B Remote Block I/O 32-Point AC Module

Product Overview

The 1791-16AC (Series B) is a high-density, self-contained Block I/O module manufactured by Rockwell Automation. Designed for distributed control via the Remote I/O (RIO) network, the 1791-16AC provides a total of 32 points, comprising 16 digital AC inputs and 16 digital AC outputs. This "all-in-one" design eliminates the need for a separate chassis, backplane, or adapter, making it an ideal solution for adding localized I/O to machinery without expanding the main PLC rack. The Series B hardware offers improved thermal management and revised electronic componentry for long-term reliability in legacy PLC-5, SLC 500, and ControlLogix systems.

Technical Specifications

The 1791-16AC is engineered to interface directly with high-voltage field devices while maintaining strict isolation for the logic circuits.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1791-16AC

• Series: Series B

• Module Type: Digital AC Block I/O

• Total Point Count: 32 Points (16 Inputs / 16 Outputs)

• Input Voltage Range: 85–132V AC (120V AC nominal)

• Output Voltage Range: 20–132V AC

• Input Current: ~10 mA per channel @ 120V AC

• Output Current Rating: 300 mA max per point @ 30°C; 150 mA max @ 60°C

• Frequency Rating: 60Hz (57–63 Hz)

• Network Interface: Allen-Bradley Remote I/O (RIO)

• Communication Rate: 57.6k, 115.2k, or 230.4k baud

• Isolation Voltage: 1500V AC (field-to-logic)

• Operating Temperature: 0°C to +55°C (32°F to 131°F)

• Weight: 2.00 lbs (0.91 kg)

• Mounting: Vertical/Horizontal Panel Mount or DIN Rail

• Lifecycle Status: Discontinued by Manufacturer (Legacy Support Active)