Description

The Allen-Bradley 1746-INT4 is an isolated thermocouple and millivolt analog input module designed for the SLC 500 programmable controller platform. This module provides high-precision temperature and voltage sensing capabilities, allowing for direct connection of various thermocouple types and low-level millivolt signals in industrial control environments. As an isolated module, it provides enhanced noise immunity and protection against ground loops, ensuring signal integrity in demanding applications.

Features

• Four isolated input channels for thermocouple or millivolt signals.
• Supports input ranges of -50 to +50 mVDC and -100 to +100 mVDC.
• Designed for seamless integration with the Allen-Bradley SLC 500 chassis.
• Provides galvanic isolation to reduce electrical interference and improve measurement accuracy.
• Low power consumption: 110 mA at 5 VDC and 85 mA at 24 VDC.

Applications

The 1746-INT4 is typically utilized in process control applications requiring temperature monitoring, such as furnace control, heat treatment processes, chemical processing, and general industrial automation where thermocouple feedback is essential for PID loops or data logging.

Technical Specifications

Installation Guidelines

• Ensure the SLC 500 chassis power is disconnected before installing or removing the module.
• Slide the module into an available slot in the SLC 500 chassis and secure it using the integrated locking tabs.
• Use shielded twisted-pair cabling for all input signals to minimize electromagnetic interference (EMI).
• Ensure proper grounding of the cable shields at the signal source or the cabinet ground bus, following standard industrial practices.
• Maintain adequate clearance around the module to allow for proper ventilation and heat dissipation within the control cabinet.
• Handle the module using ESD-safe practices to prevent damage to sensitive internal components.

FAQ

Is the 1746-INT4 still in production?

No, the 1746-INT4 has been discontinued by the manufacturer. We provide high-quality surplus units to support legacy systems.

What are the compatible spare models for this unit?

The 1746-INT4 is often interchangeable with later revisions such as the 1746-INT4/B or 1746-INT4/C, depending on your specific system firmware and configuration requirements.