Description

The Allen-Bradley 1746-NR4 is a 4-point resistance input module designed for the SLC 500 programmable logic controller system. This analog input module is specifically engineered to interface with RTD (Resistance Temperature Detector) sensors and resistive devices, providing high-precision temperature or resistance monitoring in industrial automation environments. It allows for the integration of various resistance-based sensors directly into the SLC 500 rack, facilitating reliable data acquisition for process control applications.

Features

• 4-channel analog input for RTD and resistance monitoring.
• Compatible with the Allen-Bradley SLC 500 chassis-based system.
• Configurable bandwidth settings ranging from 2.62 Hz to 65.5 Hz to suit specific noise filtering requirements.
• Designed for installation in any I/O slot of the SLC 500 chassis (excluding slot 0).
• Low power consumption profile for efficient rack operation.

Applications

This module is widely utilized in industrial process control systems requiring temperature monitoring, such as HVAC systems, chemical processing, food and beverage manufacturing, and machinery thermal management. It is suitable for applications where precise resistance-to-digital conversion is required for PLC logic processing.

Technical Specifications

Installation Guidelines

• Ensure the PLC chassis power is disconnected before installing or removing the module.
• The module can be installed in any available slot in the SLC 500 chassis except for the processor slot (Slot 0).
• Use shielded twisted-pair cabling for sensor inputs to minimize electromagnetic interference (EMI) in industrial environments.
• Ensure proper grounding of the chassis and cable shields to maintain signal integrity.
• Handle the module using ESD-safe practices to prevent damage to internal sensitive components.

FAQ

Is the 1746-NR4 still in production?

No, the Allen-Bradley 1746-NR4 was discontinued by the manufacturer on December 30, 2015. We provide refurbished or surplus units to support legacy systems.

Can this module be installed in Slot 0?

No, the 1746-NR4 must be installed in any I/O slot other than Slot 0, which is reserved for the SLC 500 processor.