OVERVIEW

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

Role/Application: This block module provides 128 total discrete I/O points (64 sourcing inputs and 64 sinking outputs) for high-density, distributed control over the Remote I/O network.

KEY SPECS SUMMARY

Power: 18-26.4V DC, 25.2 Watts max dissipation

Interfaces / Ports: Remote I/O Link, removable terminal blocks

Indicators: Power, Communication, Fault, and I/O Status LEDs

Operating Temp: 0 degrees C to plus 60 degrees C

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

Limit: 300 mA resistive load max per output channel

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the minimum required on-state current for the 64 sourcing input channels?

A: The minimum on-state current for the inputs is 1.56 milliamperes DC.

Wiring & Installation:

Q: What are the primary communication methods used by the 1791-IOVX module?

A: Communication occurs via the Remote I/O link using both block and discrete transfers.

Troubleshooting & Compatibility:

Q: What is the maximum signal delay time experienced when switching the outputs on or off?

A: The maximum on/off signal delay time for the outputs is 1.0 millisecond.

Replacement & Upgrades:

Q: Does the 1791-IOVX require external fusing for the output channels?

A: The module has internal fuses; Refer to the latest manufacturer manual for external fuse requirements.