OVERVIEW

Official designation: Allen-Bradley 1791-16A0 (Block I/O, Input Module)

Role/Application: A self-contained, discrete 16-point 120V AC input module providing signal conversion and interface functionality for Remote I/O distributed control systems.

KEY SPECS SUMMARY

Power: 85 to 132 Volts AC

Interfaces / Ports: Remote I/O link

Indicators: Status and I/O point LEDs

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC5, SLC500, RIO

Limit: Max Off-state Voltage 35 VAC

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the nominal input current drawn by the 1791-16A0 module at 120 Volts AC?

A: The nominal current draw for the external power source is 150 milliamps.

Wiring & Installation:

Q: What is the recommended minimum spacing required around the block I/O module for proper ventilation?

A: A minimum air gap clearance of 2.0 inches (50.8 millimeters) on all sides is recommended for adequate air flow.

Troubleshooting & Compatibility:

Q: What is the on-state voltage range for the discrete input channels to reliably detect a signal?

A: The input on-state voltage range is 79 to 132 Volts AC at 47 to 63 Hertz.

Replacement & Upgrades:

Q: What is the current status of the 1791-16A0, and is there a modern direct replacement?

A: The 1791-16A0 is Discontinued/Obsolete, with no official manufacturer direct replacement offered.