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Product Introduction
The Allen-Bradley 1791-24A8 Block I/O Module is a mixed AC digital I/O module designed for industrial automation systems that require both high-voltage input monitoring and output control. Developed by Rockwell Automation under the Allen-Bradley Block I/O series, this module is widely used in applications involving AC-powered field devices.
It provides 24 digital input channels (divided into 3 groups of 8) and 8 digital output channels, supporting AC voltage operation up to 120 VAC nominal. The module is designed to interface directly with AC sensors, switches, and actuators, eliminating the need for intermediate signal conversion.
With its integrated block design, the 1791-24A8 simplifies installation, reduces wiring complexity, and ensures stable performance in industrial environments where AC signal control is required.
Product Specifications
| Parameter | Specification |
|---|---|
| Product Model | Allen-Bradley 1791-24A8 |
| Product Type | Block I/O Module |
| Digital Inputs | 24 Channels (3 groups of 8) |
| Digital Outputs | 8 Channels (1 group of 8) |
| Input On-State Voltage Range | 79–132 VAC |
| Input On-State Current | 12.3 mA @ 132 V max |
| Input Off-State Voltage | 35 V max |
| Input Off-State Current | 2.3 mA min |
| Output Voltage Range | 20–123 VAC |
| Nominal Voltage | 120 VAC |
| External Power Voltage | 85–132 VAC |
| External Power Current | 150 mA |
| Signal Type | Digital AC (Discrete) |
| Mounting Method | Panel Mount |
| Module Type | Block I/O Integrated Design |
| Application Environment | Industrial automation systems |
| Dimensions | 176.5 × 98 × 110.5 mm |
| Weight | 0.85 kg |
Applications
• AC-Based Industrial Control Systems
Handles high-voltage AC input signals and output control in industrial environments.
• Production and Assembly Lines
Monitors AC-powered sensors and controls actuators such as contactors and relays.
• Building and Facility Automation
Interfaces with AC control circuits in HVAC, lighting, and infrastructure systems.
• Material Handling Systems
Controls AC-driven conveyors and monitors system status signals.
• Process Automation Applications
Used in systems requiring reliable AC signal acquisition and switching.
• OEM Equipment for AC Systems
Ideal for machinery designed with AC control architecture.
Advantages
• AC Signal Compatibility
Directly supports AC input and output signals, eliminating the need for converters.
• High Input Channel Density
Provides 24 input channels for extensive signal monitoring.
• Integrated Mixed I/O Design
Combines input and output functionality in a single compact module.
• Stable High-Voltage Operation
Designed for reliable operation under standard industrial AC voltage levels.
• Simplified Installation
Block I/O design reduces wiring complexity and installation time.
• Robust Industrial Performance
Engineered for continuous operation in demanding environments.
