OVERVIEW

Official designation: Allen-Bradley 1791-IOBX (Block I/O, High-Density Combination Discrete I/O Module)

Role/Application: This 128-point DC-powered module integrates 64 sinking inputs and 64 sourcing outputs for distributed control over the Remote I/O network.

KEY SPECS SUMMARY

Power: 18 to 26.4V DC, 300 mA max at 24V DC

Interfaces / Ports: Remote I/O link, four 37-pin removable terminal blocks

Indicators: Individual input/output LED status indicators

Operating Temp: 0 degrees C to plus 60 degrees C

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

Limit: Output current 300 mA resistive max per point

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum surge current rating for the external power supply connection?

A: The external DC power connection is rated for a maximum surge current of 2.0 Amps.

Wiring & Installation:

Q: What is the recommended mounting orientation for the 1791-IOBX module?

A: This 64- and 128-point DC block module must be mounted in a vertical panel orientation.

Troubleshooting & Compatibility:

Q: How is the 1791-IOBX module typically configured for Remote I/O communication?

A: The module is configured using two DIP switch assemblies located on the front panel.

Replacement & Upgrades:

Q: Which similar high-density module features sourcing inputs and sinking outputs instead of the IOBX configuration?

A: The equivalent module is the Allen-Bradley 1791-IOVX, which features 64 sourcing inputs and 64 sinking outputs.