1791-16A0 | Allen-Bradley Block I/O Module - Petro Auto Tech

Product Overview

The 1791-16A0 is a discrete Block I/O module from Allen-Bradley, part of the 1791 Block I/O series. This self-contained distributed I/O product integrates 16 input channels, a power supply, and a PLC interface into a single compact unit. It simplifies wiring and reduces panel space in industrial automation systems.

Technical Specifications Analysis

The 1791-16A0 features sixteen (16) 120VAC inputs divided into 2 groups of 8. It operates with an external power voltage range of 85-132VAC at 47-63 Hz, drawing 150 mA. The on-state voltage range is 79-132VAC, with a minimum on-state current of 5mA at 79V. Off-state voltage is 35V max, and off-state current is 2.3mA min. The module supports vertical or horizontal mounting and weighs 1.25 lbs (0.57 kg). It is compatible with field instruments such as proximity switches, limit switches, selector switches, float switches, and pushbutton switches.

Application Scenarios & Usage Methods

In a manufacturing plant, the 1791-16A0 monitors limit switches on a conveyor line to detect product jams. The module connects to a scanner in a daisy-chain configuration, asynchronously scanning inputs and transferring data to the controller. In a water treatment facility, it reads float switch states to control pump operation. For best results, ensure the off-state leakage current of connected output modules is less than the 2.3mA minimum off-state current of the 1791-16A0.

Installation Guide & Packing List

Mount the 1791-16A0 vertically or horizontally on a DIN rail or panel. Maintain a clearance of 2 inches (58.0 cm) on all sides for adequate ventilation. Connect external power within 85-132VAC at 47-63 Hz. The package includes the 1791-16A0 Block I/O module and mounting hardware. No additional accessories are included.

Purchasing Advice

When selecting the 1791-16A0, verify that your application requires 16 AC inputs with a nominal voltage of 120VAC. This module is ideal for distributed I/O architectures where space is limited. For reliable sourcing, choose Petro Auto Tech as your trusted industrial automation parts supplier.

Repair & Maintenance Tips

Periodically inspect the module for dust or debris buildup and clean with a dry cloth. Check that all wiring connections remain secure. Store the module in a clean, dry environment within its operating temperature range of up to 60 degrees Celsius. Avoid exposure to excessive vibration or moisture.

Frequently Asked Questions (FAQs)

Q: What is the input voltage rating of the 1791-16A0?

A: The nominal input voltage is 120VAC, with an on-state voltage range of 79-132VAC at 47-63 Hz.

Q: How many inputs does the 1791-16A0 have?

A: It has sixteen (16) inputs divided into 2 groups of 8.

Q: Can the 1791-16A0 be mounted vertically?

A: Yes, it supports both vertical and horizontal mounting.

Q: What is the maximum off-state voltage for the inputs?

A: The maximum off-state voltage is 35VAC.

Q: What is the weight of the 1791-16A0 module?

A: It weighs 1.25 lbs (0.57 kg).