OVERVIEW

Official designation: Allen-Bradley 1746-NR8 (SLC 500, RTD/Resistance Analog Input Module)

The 1746-NR8 is an 8-channel RTD/Resistance Analog Input Module for the SLC 500 modular control system. It provides precise temperature monitoring using RTD types like Platinum (385) and Nickel Iron.

KEY SPECS SUMMARY

Power: 5V DC backplane, 135 mA

Interfaces / Ports: 36-pin terminal block

Indicators: Module status LED

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: SLC 500 I/O chassis

Limit: 8 single-ended or 4 differential inputs

Lifecycle: Discontinued, limited support

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: How many total input channels does the Allen-Bradley 1746-NR8 module provide for temperature sensing?

A: The module is configured with eight single-ended input channels for connecting sensors.

Wiring & Installation:

Q: What specific wiring method is supported by the 1746-NR8 module for RTD connections?

A: The module supports 2, 3, or 4-wire RTD connection methods for compensation.

Troubleshooting & Compatibility:

Q: Which common diagnostic indicator is available on the 1746-NR8 for module health status checks?

A: A single Status LED provides basic operational and fault indication for the module.

Replacement & Upgrades:

Q: What is the primary hardware platform recommended for replacing the legacy 1746-NR8 module?

A: Modernizing to the Allen-Bradley CompactLogix or ControlLogix platform is the recommended upgrade path.