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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.
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