OVERVIEW

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

Role/Application: This module handles 4 user-configurable analog inputs and 2 current outputs for remote, high-accuracy analog signal processing and control in a Remote I/O network.

KEY SPECS SUMMARY

Power: 19.2 to 30V DC, 600 mA max current

Interfaces / Ports: Remote I/O and DH-485 ports

Indicators: POWER, COMM, FAULT, and INPUT/OUTPUT LEDs

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 primary input signal types that the 1791-NDC module can accept?

A: Inputs are user-configurable for voltage (+/-10V) or current (0 to 20 mA) signals.

Wiring & Installation:

Q: What is the maximum overvoltage protection rating provided for the analog I/O channels?

A: The module is designed with overvoltage protection rated up to 140 Volts AC.

Troubleshooting & Compatibility:

Q: What is the rated thermal power dissipation of the 1791-NDC module?

A: The maximum thermal dissipation is specified as 39.28 BTU/hr.

Replacement & Upgrades:

Q: Does this module support both block transfer and discrete transfer communication methods?

A: Yes, the 1791-NDC module supports both block transfer and discrete transfer modes.