Allen Bradley 1746-NR4 RTD Resistance Analog Input Module

Product Introduction

The Allen-Bradley 1746-NR4 is an RTD and resistance analog input module designed for the SLC 500 programmable controller platform. It provides accurate measurement of temperature and resistance-based signals, enabling reliable monitoring of thermal processes in industrial automation systems.

This module supports four RTD or resistance input channels, allowing direct connection to temperature sensors without external signal conditioners. With stable excitation current and robust signal processing, the module delivers consistent performance in applications requiring precise temperature and resistance measurement under industrial operating conditions.

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Product Specifications

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Applications

• Temperature monitoring using RTD sensors in industrial processes

• Resistance-based measurement for thermal and material monitoring

• Process automation systems requiring stable temperature feedback

• Integration into SLC 500 PLC platforms for modular analog expansion

• Industrial equipment protection, monitoring thermal conditions of machinery

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Advantages

• Supports RTD and resistance inputs, eliminating the need for external signal converters

• Four independent input channels, enabling compact temperature measurement solutions

• Stable excitation current, ensuring accurate and repeatable measurements

• Modular SLC 500 compatibility, simplifying system integration

• Reliable industrial performance, suitable for continuous operation

• Compact design, conserving space in PLC control cabinets

FAQ

1. What types of sensors can be connected to this module?
   It supports RTD sensors and resistance-based input devices.

2. How many input channels are available?
   The module provides four independent input channels.

3. Is it compatible with the SLC 500 PLC system?
   Yes, it is designed specifically for SLC 500 modular PLC platforms.

4. What is the excitation current used for measurement?
   The module provides a stable excitation current of 50 mA.

5. Can it be used for temperature monitoring applications?
   Yes, it is commonly used for accurate temperature measurement with RTD sensors.

6. Does the module support resistance measurement?
   Yes, it supports both RTD and resistance input types.

7. Is the module suitable for continuous industrial operation?
   Yes, it is designed for long-term operation in industrial environments.

8. What frequency range does the module operate within?
   It operates within an input frequency range of 2.62 to 65.5 Hz.

9. Does it require external signal conditioning?
   No, RTD and resistance signals can be connected directly.

10. What should be checked during installation?
    Proper sensor wiring, grounding, and correct input configuration should be verified.

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