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A-B 1791-32A0 Block I/O 32-Point AC Input Module

Product Overview

The Allen-Bradley 1791-32A0 is a 32-point AC input Block I/O module designed for distributed industrial control systems. It connects field devices to a PLC through the Remote I/O (RIO) network and monitors 120 VAC digital input signals. Despite being listed as a digital I/O module, this model is specifically an input-only module, with no output channels.

Rockwell Automation

Key Technical Specifications

Specification	Details
Brand	Allen-Bradley (A-B)
Model	1791-32A0
Product Series	1791 Block I/O
Product Type	AC Digital Input Module
Number of Inputs	32
Number of Outputs	0
Nominal Input Voltage	120 VAC
Input Voltage Range	79–132 VAC, 47–63 Hz
Input Configuration	4 groups of 8 inputs
Communication Protocol	Remote I/O (RIO)
External Power Supply	85–132 VAC, 47–63 Hz
External Supply Current	150 mA
Power Dissipation	13.62 W maximum
Operating Temperature	0–60°C
Dimensions (H × W × D)	176.5 × 110.5 × 98 mm
Mounting	DIN rail or panel mounting
Product Status	Discontinued

Rockwell Automation

Features & Advantages

Provides 32 discrete AC input channels.
Supports four electrically grouped sets of eight inputs.
Communicates with compatible PLC systems through Remote I/O.
Provides electrical isolation between input groups and logic circuitry.
Designed for distributed field-signal monitoring.
Suitable for replacement and maintenance of legacy Allen-Bradley control systems.

Typical Applications

Industrial automation and PLC systems
AC limit switches and selector switches
Machine status monitoring
Distributed input collection
Manufacturing and processing equipment
Legacy Remote I/O installations

Important Notes

This model accepts 120 VAC digital input signals; it is not a 24 VDC input module.
The 1791-32A0 provides inputs only, not digital outputs.
Confirm compatibility with the PLC, Remote I/O scanner, and existing wiring before ordering.
This is a legacy/discontinued product; verify condition and revision before purchase.