OVERVIEW

Official designation: Allen-Bradley 1791-24A8 (Block I/O, Input and Output Module)

Role/Application: A compact, self-contained module providing 24 discrete 120V AC inputs and 8 discrete 120V AC outputs for distributed Remote I/O control systems.

KEY SPECS SUMMARY

Power: 85 to 132 Volts AC

Interfaces / Ports: Remote I/O link

Indicators: COMM, STATUS, I/O points

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC2, PLC5, SLC500

Limit: Max 18.76 Watts dissipation

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum AC current surge the output channels can withstand?

A: The output channels can handle a 10 Amps surge for 50 milliseconds, repeatable every 2 seconds.

Wiring & Installation:

Q: What are the recommended mounting orientations and air gap requirements for the module?

A: Vertical mounting is recommended; a minimum 2.0 inch air gap on all four sides is required.

Troubleshooting & Compatibility:

Q: What is the nominal input voltage range required for the module to detect an on-state signal?

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

Replacement & Upgrades:

Q: What is the current lifecycle status of the Allen-Bradley 1791-24A8 I/O module?

A: The 1791-24A8 Block I/O module is currently classified by the manufacturer as Discontinued/Obsolete.