OVERVIEW

Official designation: Allen-Bradley 1791-N4C2 (Block I/O, Analog Input/Current Output Combination Module)

Role/Application: This module handles 4 configurable analog inputs and 2 factory-set current outputs for high-precision data acquisition over the Remote I/O link.

KEY SPECS SUMMARY

Power: 85 to 132V AC, 16.9W max dissipation

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

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 degrees C to plus 60 degrees C

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

Limit: Input accuracy 0.1 percent, update rate 108 milliseconds

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the configurable input signal ranges and the output current range?

A: Inputs are selectable for 0-10V DC, 0-20 mA, or +/-20 mA; outputs are 0-20 mA.

Wiring & Installation:

Q: What is the recommended installation position and the physical dimensions of the module?

A: Vertical mounting is recommended; dimensions are 6.95H x 2.71W x 3.85D inches.

Troubleshooting & Compatibility:

Q: What is the linearity specification for the input channels at 25 degrees Celsius?

A: The input linearity is specified at approximately 0.05 percent at 25 degrees Celsius.

Replacement & Upgrades:

Q: Can the 1791-N4C2 be used with the Remote I/O protocol for both block and discrete transfer?

A: Yes, the module supports both block and discrete transfer modes via the Remote I/O link.