Allen-Bradley 1791-16AC Block I/O Module with 16 Inputs and 16 Outputs

Product Overview

Industrial automation systems often require distributed control points to reduce wiring costs and improve flexibility. The Allen-Bradley 1791-16AC block I/O module addresses this need by integrating power supply, PLC interface, I/O connections, and signal processing into a single compact unit. This module belongs to the 1791 Block I/O product line and functions as a complete remote I/O node.

Technical Specifications Breakdown

Key parameters for the 1791-16AC are listed below for quick reference:

Industry Applications

The 1791-16AC is ideally suited for implementing remote I/O architectures in manufacturing and process environments. With 16 discrete inputs and 16 discrete outputs operating at 120VAC, this module connects field devices like proximity switches, limit switches, and pushbuttons to a central controller via Remote I/O protocol using a daisy-chain topology. Typical applications include material handling systems, packaging lines, and assembly stations where distributed control reduces cabling complexity.

Installation & Setup Guidance

Mount the 1791-16AC in either vertical or horizontal orientation depending on cabinet space and cooling requirements. Vertical mounting allows higher output current ratings due to improved air circulation. The module requires an external power source of 85 to 132 Volts AC at 47-63 Hz. Connect the Remote I/O communication interface to the main controller configured as a Remote I/O scanner. Ensure all input and output wiring complies with local electrical codes.

Maintenance & Reliability

Periodically inspect the module for dust accumulation and ensure ventilation openings remain clear. Verify that the external power supply voltage stays within the specified 85-132VAC range. Check that all field device connections are secure and free from corrosion. The module's isolation voltage rating of 500VAC for Power Supply to RIO and 1250VAC for I/O group to I/O group helps protect against electrical faults.

Compatibility & Integration

It acts as a remote I/O adapter, communicating with a main controller equipped with a remote I/O scanner. Compatible input devices include binary devices such as selector switches, float switches, and auxiliary contacts. Output devices can include pilot lamps, relay coils, horns, buzzers, and solenoid-actuated devices.

Selection Guide & Purchasing Advice

When selecting the 1791-16AC for your application, verify that your controller supports Remote I/O protocol and that the total current draw of connected output devices does not exceed the module's ratings. AutoDCSTech offers this module along with technical support to ensure proper integration into your system. Please verify current lifecycle status and availability with AutoDCSTech before ordering.