1746-INT4 | Allen-Bradley | SLC 500 Isolated Thermocouple/mV Input Module

Product Overview

The Allen-Bradley 1746-INT4 provides high-resolution temperature and low-voltage analog acquisition for the SLC 500 PLC platform. This module specializes in interfacing directly with thermocouples and millivolt (mV) sources, eliminating the need for external signal transmitters. It supports a wide array of thermocouple types and millivolt ranges, including ±50 mV and ±100 mV DC. We supply this unit in 100% Brand New and Original condition, ensuring your legacy SLC systems maintain factory-certified accuracy and long-term stability.

Technical Specifications

Engineering Advantages

The 1746-INT4 solves critical signal integrity issues in industrial thermal processing environments:

• Superior Channel Isolation: The module features individual galvanic isolation for each input channel. This architecture prevents ground loops and repels high-voltage transients that typically corrupt low-level millivolt signals in large-scale furnace or boiler applications.

• Direct Thermocouple Integration: Internal cold-junction compensation and linearization allow the module to interface directly with Type J, K, T, E, R, S, B, and N thermocouples. This hardware integration reduces hardware costs by removing the requirement for intermediate mV-to-4-20mA converters.

• Precision Millivolt Acquisition: The ±50 mV and ±100 mV DC ranges facilitate the use of high-accuracy sensors and shunts. The 1746-INT4 captures minute voltage fluctuations, providing the SLC processor with the granular data required for tight PID control loops.

• Simplified Slot Configuration: The module fits into any available I/O slot in a 1746 chassis. It utilizes standard SLC 500 addressing and configuration blocks, allowing for rapid deployment and commissioning without specialized communication bridge modules.

• Ruggedized Signal Conditioning: Onboard digital filtering repels 50/60 Hz line noise. This ensures the PLC receives stable temperature data even when cables run near high-power motors or variable frequency drives (VFDs).

FAQs

• How do I verify the "Brand New" status of this 1746-INT4?

  We guarantee every unit arrives in its original Allen-Bradley factory packaging with intact security seals. This ensures the internal capacitors and semiconductors have never experienced thermal stress or electrical runtime, which is critical for maintaining the accuracy of an analog input module.

• Does the 1746-INT4 require an external power supply?

  No. The module draws its required operating current (110mA @ 5V and 85mA @ 24V) directly from the SLC 500 chassis backplane. You must ensure your chassis power supply has sufficient capacity to support the addition of this analog module.

• Can I mix thermocouple types on the same module?

  Yes. You configure each of the four channels independently through the PLC programming software (RSLogix 500). This allows you to monitor different temperature ranges or sensor types (e.g., Type K and Type J) on a single 1746-INT4 module.

• Is this module a direct replacement for existing SLC 500 thermocouple cards?

  The 1746-INT4 serves as the standard isolated thermocouple input for the SLC 500 family. It offers superior noise immunity compared to non-isolated variants, making it the preferred choice for industrial environments with significant electrical interference.