Allen-Bradley 1791-0A32 Block I/O AC Output Module Overview

Product Introduction

In industrial automation, managing multiple AC output devices efficiently is critical. The Allen-Bradley 1791-0A32 Block I/O module addresses this need with a high-density design featuring thirty-two (32) AC output channels. As part of the 1791 Block I/O family, this module integrates a built-in power supply, programmable controller interface, and signal conditioning in a compact form factor. It operates as a slave device, functioning like a distributed I/O station, and supports Remote I/O (RIO) protocol for direct communication with RIO scanners. This makes it a reliable choice for controlling motor starters, solenoid actuators, indicators, and other electrical loads in manufacturing and process environments.

Technical Specifications Breakdown

The 1791-0A32 delivers an output voltage range of 20-132V AC, with a nominal output voltage of 120V AC. It requires an external power supply of 85-132V AC. The module groups its thirty-two outputs into four groups of eight channels each, simplifying wiring and troubleshooting. Key performance metrics include an off-state leakage current of 3 mA and a maximum on-state current of 50 mA per output. The module can handle a surge current of 10 A for 50 ms, repeatable every 2 seconds. Output delay times are 1.0 ms (off-to-on) at both 60 Hz and 50 Hz, and 8.3 ms (on-to-off) at 60 Hz or 10.0 ms at 50 Hz. These parameters ensure precise control in time-sensitive applications.

Industry Applications

The 1791-0A32 excels in applications requiring reliable switching of AC loads. For example, in a packaging line, it can control multiple solenoid valves and indicators simultaneously, leveraging its 32 outputs to reduce cabinet space. In material handling, it manages motor starters for conveyors, with the surge current capability handling inrush demands. Its compatibility with PLC-2, PLC-3, and PLC-5 controllers makes it a versatile upgrade for legacy systems, offering a cost-effective path to modernize without replacing entire control architectures.

Installation & Setup Guidance

Mount the 1791-0A32 in either vertical or horizontal orientation. For vertical mounting, maximum output current is 600 mA at 30°C or 300 mA at 60°C; for horizontal mounting, it is 300 mA at 30°C or 150 mA at 60°C. Power connections use terminals L1 (1), N (3), and GND (2). Remote I/O connections are made via BLU (6), CLR (8), and SHD (7) terminals on the left side. Open the front cover to set the I/O rack number using the group switch assembly. Status indicators on the front cover aid in troubleshooting. Ensure operational temperature remains between 0°C and 60°C.

Compatibility & Integration

The 1791-0A32 integrates seamlessly with Allen-Bradley controllers including PLC-2, PLC-3, PLC-5/20, and PLC-5 families. It communicates via Remote I/O (RIO) protocol, working with scanners like the 1771-SN, 1772-SD/SD2, and 1775-S5/SR5. This compatibility allows it to fit into existing distributed I/O networks, reducing integration complexity. The module acts as a complete I/O interface, combining adapter and I/O rack functionality in one unit.

Selection Guide & Purchasing Advice

Before purchasing the 1791-0A32, verify its lifecycle status—this model is discontinued/obsolete. Contact BluePLC Industrial to confirm current availability and explore replacement options. Ensure your system supports Remote I/O protocol and that the external power supply meets the 85-132V AC requirement. For complete technical specifications, please contact BluePLC Industrial. Our team can help you find compatible modules or suggest alternatives to keep your operations running smoothly.