OVERVIEW

Official designation: Allen-Bradley 1791-8BR (Block I/O, Combination Discrete Input/Relay Output Module)

Role/Application: This module provides 8 discrete 24V DC inputs and 8 relay (dry contact) outputs for distributed control using the Remote I/O protocol.

KEY SPECS SUMMARY

Power: 19.2 to 30V DC, 300 mA draw

Interfaces / Ports: Remote I/O link, two terminal strips

Indicators: Individual channel LED indicators

Operating Temp: 0 degrees C to plus 60 degrees C

Platform / Compatibility: PLC-2, PLC-3, PLC-5, and SLC-500

Limit: Output current 1A resistive max @ 20-132V AC or 20-30V DC

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the input ON-state voltage range and maximum input ON-state current?

A: The input ON-state voltage is 10-30V DC, with a maximum current of 11 mA at 30V DC.

Wiring & Installation:

Q: What is the maximum AC voltage rating that the relay outputs can switch?

A: The relay outputs are rated for a maximum of 132V AC resistive load.

Troubleshooting & Compatibility:

Q: What is the minimum expected life of the relay output electrical contacts?

A: Expected contact life is 100K operations minimum at the maximum rated loads.

Replacement & Upgrades:

Q: What are the primary dimensions of the 1791-8BR module for panel installation?

A: Dimensions are 6.95 inches high, 2.7 inches wide, and 3.85 inches deep.